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1. Additive rheology of complex granular flows

Author: Thanh Trung Vo, Saeid Nezamabadi, Patrick Mutabaruka, Jean-Yves Delenne, and Farhang Radjai
Subjects: Science
Abstract: Granular materials are abundant in nature, but we haven’t fully understood their rheological properties as complex interactions between particles are involved. Here, Vo et al. show that granular flows can be described by a generalized dimensionless number based on stress additivity.
Published: 2020
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2. Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Author: Mojtaba Ghadiri, Mehrdad Pasha, Wenguang Nan, Colin Hare, Vincenzino Vivacqua, Umair Zafar, Saeid Nezamabadi, Alejandro Lopez, Massih Pasha, and Sadegh Nadimi
Subjects: cohesive powder, bulk flow, characterisation, flowability, spreadability, additive manufacturing, Technology (General), T1-995, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties, particulate form, and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging. However, this is highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable.Characterisation of bulk powder failure for flow initiation (quasi-static) is well established. However, bulk flow parameters are all sensitive to strain rate with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of the bulk parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of the shear strain rate, but the challenge is relating the bulk behaviour to the physical and mechanical properties of constituting particles. A critique of the current state of the art in characterisation and analysis of cohesive powder flow is presented, addressing the effects of cohesion, strain rate, fluid medium drag and particle shape.
Published: 2019
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3. Parallel implicit contact algorithm for soft particle systems.

Author: Saeid Nezamabadi, Xavier Frank, Jean-Yves Delenne, Julien Averseng, and Farhang Radjai
Published: 2019
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4. Deformation Field in Diametrically Loaded Soft Cylinders

Author: Serge Mora, Jonathan Barés, Saeid Nezamabadi, Thi-Lo Vu, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Moyens expérimentaux (Servex)
Subjects: Digital image correlation, Materials science, Field (physics), Constitutive equation, Aerospace Engineering, 02 engineering and technology, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Deformation (meteorology), Silicone rubber, chemistry.chemical_compound, 0203 mechanical engineering, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Soft particle, Mechanical Engineering, Mechanics, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Finite element method, 020303 mechanical engineering & transports, chemistry, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Mechanics of Materials, Finite strain, Finite strain theory, Solid mechanics, 0210 nano-technology
Abstract: International audience; Deformation fields at the surface of diametrically squeezed shallow cylinders in the large deformation regime are measured experimentally and numerically for different material behaviour in the large deformation regime. By means of a digital image correlation method optimized for large displacements, strain fields are measured and compared with finite element simulations. Assuming a neo-Hookean behaviour for cylinders made of rubber silicone, the strain field is found to be in quantitative agreement with non-linear finite element simulations up to the highest deformations reached in our experiments (15%). For materials that follow an elastoplastic constitutive law, agreement is lost after few percents of deformation and location of the strain field differences are identified up to strains as high as 30%. Strain field evolution is also measured for solid foam cylinders up to 60% of global deformation strain. This method that can be applied to a broad variety of materials, even in the occurrence of large deformations, provides a way to study quantitatively local features of the mechanical contact.
Published: 2019

5. Modelling the compaction of plastic particle packings

Author: Mojtaba Ghadiri, Jean-Yves Delenne, Farhang Radjai, Saeid Nezamabadi, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of Leeds, ANR-16-IDEX-0006,MUSE,MUSE(2016), and ANR-10-LABX-0001,AGRO,Agricultural Sciences for sustainable Development(2010)
Subjects: Materials science, 0211 other engineering and technologies, Computational Mechanics, Compaction, Material point method, 02 engineering and technology, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Granular material, Atomic packing factor, 01 natural sciences, Stress (mechanics), Rheology, Contact dynamics, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 0101 mathematics, 021101 geological & geomatics engineering, Civil and Structural Engineering, Fluid Flow and Transfer Processes, Numerical Analysis, Granular materials, Mechanics, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 010101 applied mathematics, Computational Mathematics, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Modeling and Simulation, Hardening (metallurgy), Particle, Powders, Plastic particles
Abstract: International audience; Soft particle materials such as some pharmaceutical and food products are composed of particles that can undergo large deformations under low confining pressures without rupture. The rheological and textural properties of these materials are thus governed by both particle rearrangements and particle shape changes. For the simulation of soft particle materials, we present a numerical technique based on the material point method, allowing for large elasto-plastic particle deformations. Coupling the latter with the contact dynamics method makes it possible to deal with contact interactions between particles. We investigate the compaction of assemblies of elastic and plastic particles. For plastic deformations, it is observed that the applied stress needed to achieve high packing fraction is lower when plastic hardening is small. Moreover, predictive models, relating stress and packing fraction, are proposed for the compaction of elastic and plastic particles. These models fit well our simulation results. Furthermore, it is found that the evolution of the coordination number follows a power law as a function of the packing fraction beyond jamming point of hard particle packings.
Published: 2021

6. Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Author: Mojtaba Ghadiri, Mehrdad Pasha, Wenguang Nan, Colin Hare, Vincenzino Vivacqua, Umair Zafar, Saeid Nezamabadi, Alejandro Lopez, Massih Pasha, Sadegh Nadimi, University of Leeds, Nanjing University of Science and Technology [Nanjing], University of Surrey (UNIS), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Universidad de Deusto [Bilbao] (DEUSTO), University of Deusto, Newcastle University [Newcastle], Nanjing University of Science and Technology (NJUST), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Universidad de Deusto (DEUSTO), The Chemours Company, Virtual Formulation Laboratory Grant of the EPSRC Future Formulation Programme (EP/N025261/1), Advanced Manufacturing Supply Chains Initiative (AMSCI) and the Medicines Manufacturing Industry Partnership (MMIP), UK, through the funding of the `Advanced Digital Design of Pharmaceutical Therapeutics' (Grant No. 14060), the EPSRC Programme Grant: Friction: The Tribology Enigma (EP/R001766/1), Project ID 1502-607 funded through ANR (the French National Research Agency), and ANR-16-IDEX-0006,MUSE,MUSE(2016)
Subjects: characterisation, Materials science, General Chemical Engineering, flowability, 02 engineering and technology, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Shear cell, 020401 chemical engineering, lcsh:Technology (General), [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], spreadability, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, General Materials Science, 0204 chemical engineering, Composite material, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Rheometry, General Engineering, Humidity, General Chemistry, bulk flow, Strain rate, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], Shear strain rate, Drag, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], lcsh:T1-995, lcsh:QC770-798, Cohesion (chemistry), 0210 nano-technology, Material properties, additive manufacturing, cohesive powder
Abstract: International audience; Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties, particulate form, and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging. However, this is highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable. Characterisation of bulk powder failure for flow initiation (quasi-static) is well established. However, bulk flow parameters are all sensitive to strain rate with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of the bulk parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of the shear strain rate, but the challenge is relating the bulk behaviour to the physical and mechanical properties of constituting particles. A critique of the current state of the art in characterisation and analysis of cohesive powder flow is presented, addressing the effects of cohesion, strain rate, fluid medium drag and particle shape.
Published: 2020

7. Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Author: Saeid Nezamabadi, Patrick Mutabaruka, Thanh-Trung Vo, Jean-Yves Delenne, Farhang Radjai, Danang Architecture University (DAU), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ministry of Education and Training in Vietnam, Campus France, and ANR-10-LABX-0020,NUMEV,Digital and Hardware Solutions and Modeling for the Environement and Life Sciences(2010)
Subjects: Materials science, Capillary action, Structure granulaire, Mechanics, Granular material, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, Shear rate, Surface tension, Shear (geology), Agglomerate, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 0103 physical sciences, Simulation numérique 3D, Astrophysics::Earth and Planetary Astrophysics, [PHYS.MECA.BIOM]Physics [physics]/Mechanics [physics]/Biomechanics [physics.med-ph], 010306 general physics, Shear flow, Scaling
Abstract: International audience; We use particle dynamics simulations to investigate the evolution of a wet agglomerate inside homogeneous shear flows of dry particles. The agglomerate is modeled by introducing approximate analytical expressions of capillary and viscous forces between particles in addition to frictional contacts. During shear flow, the agglomerate may elongate, break, or be eroded by loss of its capillary bonds and primary particles. By systematically varying the shear rate and surface tension of the binding liquid, we characterize the rates of these dispersion modes. All the rates increase with increasing inertial number of the flow and decreasing cohesion index of the agglomerate. We show that the data points for each mode collapse on a master curve for a dimensionless scaling parameter that combines the inertial number and the cohesion index. The erosion rate vanishes below a cutoff value of the scaling parameter. This leads to a power-law borderline between the vanishing erosion states and erosion states in the phase space defined by the inertial number and the cohesion index.
Published: 2019

8. Parallel implicit contact algorithm for soft particle systems

Author: Xavier Frank, Jean-Yves Delenne, Julien Averseng, Farhang Radjai, Saeid Nezamabadi, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Structures Innovantes, Géomatériaux, ECOconstruction (SIGECO), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), ANR (the French National Research Agency) under the 'Investissements d’avenir' programme with the reference ANR-10-LABX-001-01 Labex Agro and coordinated by Agropolis Fondation, France under the frame of I-SITE MUSE (ANR-16-IDEX-0006), ANR-10-LABX-0001,AGRO,Agricultural Sciences for sustainable Development(2010), and ANR-16-IDEX-0006,MUSE,MUSE(2016)
Subjects: Materials science, General Physics and Astronomy, Material point method, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Granular material, 01 natural sciences, 010305 fluids & plasmas, Contact dynamics, 0103 physical sciences, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 010306 general physics, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Particle system, Granular materials, Hyperelasticity, Mechanics, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], Deformation mechanism, Hardware and Architecture, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Hyperelastic material, Finite strain theory, Finite strain, Compressibility, MPI
Abstract: International audience; This paper presents a numerical technique to model soft particle materials in which the particles can undergo large deformations. It combines an implicit finite strain formalism of the Material Point Method and the Contact Dynamics method. In this framework, the large deformations of individual particles as well as their collective interactions are treated consistently. In order to reduce the computational cost, this method is parallelised using the Message Passing Interface (MPI) strategy. Using this approach, we investigate the uniaxial compaction of 2D packings composed of particles governed by a Neo-Hookean material behaviour. We consider compressibility rates ranging from fully compressible to incompressible particles. The packing deformation mechanism is a combination of both particle rearrangements and large deformations, and leads to high packing fractions beyond the jamming state. We show that the packing strength declines when the particle compressibility decreases, and the packing can deform considerably. We also discuss the evolution of the connectivity of the particles and particle deformation distributions in the packing.
Published: 2019

9. Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

Author: Jonathan Barés, Saeid Nezamabadi, Serge Mora, Thi-Lo Vu, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Moyens expérimentaux (Servex)
Subjects: Digital image correlation, Materials science, Constitutive equation, Finite elements, Compaction, Uniaxial compression, Mechanics, Microstructure, 01 natural sciences, Finite element method, Elasticity, 010305 fluids & plasmas, [SPI.MAT]Engineering Sciences [physics]/Materials, Contact dynamics, 0103 physical sciences, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Elasticity (economics), 010306 general physics
Abstract: This work was partially supported by Labex NUMEV (ANR-10-LABX-20); International audience; Using the contact dymanics method together with the finite element method, we simulate the uniaxial compression of assemblies of elastic cylinders. The numerical model accounts for finite deformations of the particles through the neo-Hookean constitutive equation and solid friction between the particles. A quantitative comparison with experiments carried out with centimetric rubberlike cylinders, with local deformations of the particles determined by image correlation, is proposed. We show that the simulations accurately capture the details of both the microstructure and the macroscopic behavior of the real granular system, demonstrating the relevancy of the numerical approach.
Published: 2019

10. Agglomeration of wet particles in dense granular flows

Author: Patrick Mutabaruka, Saeid Nezamabadi, Roland J.-M. Pellenq, Thanh-Trung Vo, Farhang Radjai, Jean-Yves Delenne, Edouard Izard, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Danang Architecture University, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), ArcelorMittal Maizières Research SA, ArcelorMittal, Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Danang Architecture University (DAU), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: Materials science, Capillary action, Dispersity, Biophysics, 02 engineering and technology, Granular material, 01 natural sciences, Homogeneous distribution, 010305 fluids & plasmas, Physics::Fluid Dynamics, [SPI]Engineering Sciences [physics], Granular Materials, 0103 physical sciences, General Materials Science, Flowing Matter, Economies of agglomeration, Granule (cell biology), Surfaces and Interfaces, General Chemistry, Mechanics, 021001 nanoscience & nanotechnology, Discrete element method, Condensed Matter::Soft Condensed Matter, Particle size, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], Biotechnology
Abstract: International audience; In order to get insight into the wet agglomeration process, we numerically investigate the growth of a single granule inside a dense flow of an initially homogeneous distribution of wet and dry particles. The simulations are performed by means of the discrete element method and the binding liquid is assumed to be transported by the wet particles, which interact via capillary and viscous force laws. The granule size is found to be an exponential function of time, reflecting the conservation of the amount of liquid and the decrease of the number of available wet particles inside the flow during agglomeration. We analyze this behavior in terms of the accretion and erosion rates of wet particles for a range of different values of material parameters such as mean particle size, size polydispersity, friction coefficient and liquid viscosity. In particular, we propose a phase diagram of the granule growth as a function of the mean primary particle diameter and particle size span, which separates the parametric domain in which the granule grows from the domain in which the granule does not survive.
Published: 2019

11. Effects of particle compressibility on structural and mechanical properties of compressed soft granular materials

Author: Thi-Lo Vu, Serge Mora, Saeid Nezamabadi, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ton Duc Thang University [Hô-Chi-Minh-City], Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
Subjects: Finite elasticity, Finite element method, Materials science, FOS: Physical sciences, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, Granular material, Atomic packing factor, Contact dynamics method, 01 natural sciences, 010305 fluids & plasmas, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], 0103 physical sciences, Contact dynamics, Composite material, Granular materials, Range (particle radiation), Soft particle, Mechanical Engineering, 021001 nanoscience & nanotechnology, Condensed Matter Physics, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Mechanics of Materials, Compressibility, Soft Condensed Matter (cond-mat.soft), Particle, 0210 nano-technology
Abstract: Changes in the mechanical properties of granular materials, induced by variations in the intrinsic compressibility of the particles, are investigated by means of numerical simulations based on the combination of the Finite Element and Contact Dynamics methods. Assemblies of athermal 2D particles are subjected to quasi-static uni-axial compactions up to packing fractions close to $1$. Inspired by the contact mechanics in the Hertz's limit, we show that the effect of the compressibility of the particles both on the global and the local stresses, can be described by considering only the packing fraction of the system. This result, demonstrated in the whole range of accessible packing fractions in case of frictionless particles, remains relevant for moderate inter-particles coefficients of friction. The small discrepancies observed with frictional particles originate from irreversible local reorganizations in the system, the later being facilitated by the compressibility of the particles.
Published: 2021

12. Rheology of soft granular materials: uniaxial compression

Author: Jean-Yves Delenne, Serge Mora, Farhang Radjai, Mojtaba Ghadiri, Saeid Nezamabadi, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and University of Leeds
Subjects: Materials science, Physics, QC1-999, Surface force, Compaction, [PHYS.MECA]Physics [physics]/Mechanics [physics], 02 engineering and technology, 021001 nanoscience & nanotechnology, Atomic packing factor, Granular material, Overburden pressure, 01 natural sciences, Condensed Matter::Soft Condensed Matter, Rheology, 0103 physical sciences, Contact dynamics, Composite material, 010306 general physics, 0210 nano-technology, Material point method
Abstract: International audience; Soft granular materials are assemblies of highly deformable grains interacting via surface forces. The large grain deformations of these materials differ them from hard granular systems, in which, their behaviors are essentially governed by grain rearrangements. In this paper, we study the uniaxial compression of soft granular materials using a numerical approach based on the Material Point Method allowing for large grain deformations, coupled with the Contact Dynamics method for the treatment of unilateral frictional contacts between grains. Considering the neo-Hookean and elasto-plastic grains, the compaction of 2D soft granular packings is analyzed. We focus essentially on the evolution of the packing vertical stress as a function of the packing fraction and the predictive models are proposed.
Published: 2021

13. Mechanical strength of wet particle agglomerates

Author: Jean-Yves Delenne, Roland J.-M. Pellenq, Patrick Mutabaruka, Thanh-Trung Vo, Edouard Izard, Farhang Radjai, Saeid Nezamabadi, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Danang Architecture University, Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), ArcelorMittal Maizières Research SA, ArcelorMittal, Danang Architecture University (DAU), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Subjects: structure granulaire, Materials science, Capillary action, Agglomerate, Ingénierie des aliments, agglomération humide, Mechanics of materials, Atomic packing factor, 01 natural sciences, Plastic strength, 010305 fluids & plasmas, Discrete element method, Stress (mechanics), Physics::Fluid Dynamics, capillarité, 0103 physical sciences, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Food engineering, Granular matter, Capillary force law, Diametrical compression, General Materials Science, force de compression, Composite material, 010306 general physics, Civil and Structural Engineering, Capillary bridges, Mechanical Engineering, simulation numérique, Condensed Matter Physics, Compression (physics), simulation, Condensed Matter::Soft Condensed Matter, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Compressive strength, Particle, Mécanique des matériaux
Abstract: International audience; Using particle dynamics simulations, we investigate the strength and microstructure of agglomerates of wet frictional particles subjected to axial compression. The numerical model accounts for the cohesive and viscous effects of the binding liquid up to a debonding distance with the liquid assumed to be distributed homogeneously inside the agglomerate. We show that wet agglomerates undergo plastic deformation due to the rearrangements of primary particles during compression. The compressive strength is thus characterized by the plastic threshold before the onset of failure by the irreversible loss of wet contacts between primary particles. We find that the agglomerate plastic threshold is proportional to the characteristic cohesive stress defined from the liquid-vapor surface tension and the mean diameter of primary particles, with a prefactor that is a nearly linear function of the debonding distance and increases with size span. We analyze the agglomerate microstructure and, considering only the cohesive capillary forces at all bonds between primary particles, we propose an expression of the plastic strength as a function of the texture parameters such as the wet coordination number and packing fraction. This expression is shown to be consistent with our simulations up to a multiplicative factor reflecting the distribution of the capillary bridges.
Published: 2018

14. Multiscale modeling for bioresources and bioproducts

Author: Xavier Frank, Alberto Paolo Tonda, Nicolas Blanc, Jean-Yves Delenne, Thomas Chabin, Frédéric Mabille, Farhang Radjai, V. Hugouvieux, Thierry Ruiz, Evelyne Lutton, Marc Barnabe, Agnès Duri, Nathalie Perrot, Saeid Nezamabadi, Génie et Microbiologie des Procédés Alimentaires (GMPA), AgroParisTech-Institut National de la Recherche Agronomique (INRA), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Sciences Pour l'Oenologie (SPO), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université Montpellier 1 (UM1)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Génie et Microbiologie des Procédés Alimentaires ( GMPA ), Institut National de la Recherche Agronomique ( INRA ) -AgroParisTech, Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Sciences Pour l'Oenologie ( SPO ), Institut National de la Recherche Agronomique ( INRA ) -Institut de Recherche pour le Développement ( IRD [Nouvelle-Calédonie] ) -Université de Montpellier ( UM ) -Université Montpellier 1 ( UM1 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Barnabé, Marc, Blanc, Nicolas, Chabin, Thomas, Delenne, Jean-Yves, Duri, Agnès, Frank, Xavier, Hugouvieux, Virginie, Lutton, EVELYNE, Mabille, Frederic, Nezamabadi, Saeid, Perrot, Nathalie, Radjaï, Farhang, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), and Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Subjects: Ingénierie des aliments, granular structure, Grain mobility, computer.software_genre, 01 natural sciences, Structuring, Industrial and Manufacturing Engineering, 010305 fluids & plasmas, Interactive Learning, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], système expert, processus d'apprentissage, Numerical modeling, [SDV.IDA]Life Sciences [q-bio]/Food engineering, Graphical model, apprentissage machine, 2. Zero hunger, Physics, méthode prédictive, [ SDV.IDA ] Life Sciences [q-bio]/Food engineering, Granular matter, Multiscale modeling, Living systems, maturation du raisin, analyse multiéchelle, Graphical models, structure granulaire, Process (engineering), microstructure, production bactérienne, Context (language use), Mechanics, models, Artificial Intelligence, 0103 physical sciences, Machine learning, Hydrotextural diagram, maturation du fromage, Food engineering, [ INFO.INFO-AI ] Computer Science [cs]/Artificial Intelligence [cs.AI], 010306 general physics, expert system, Soft-matter physics, Microstructure, Elaboration process, Expert knowledge, Interactive learning, General Chemistry, Intelligence artificielle, Expert system, Graphical, Biochemical engineering, computer, Food Science
Abstract: International audience; Designing and processing complex matter and materials are key objectives of bioresource and bioproduct research. Modeling approaches targeting such systems have to account for their two main sources of complexity: their intrinsic multi-scale nature; and the variability and heterogeneity inherent to all living systems. Here we provide insight into methods developed at the Food & Bioproduct Engineering division (CEPIA) of the French National Institute of Agricultural Research (INRA). This brief survey focuses on innovative research lines that tackle complexity by mobilizing different approaches with complementary objectives. On one hand cognitive approaches aim to uncover the basic mechanisms and laws underlying the emerging collective properties and macroscopic behavior of soft- matter and granular systems, using numerical and experimental methods borrowed from physics and mechanics. The corresponding case studies are dedicated to the structuring and phase behavior of biopolymers, powders and granular materials, and to the evolution of these structures caused by external constraints. On the other hand machine learning approaches can deal with process optimizations and outcome predictions by extracting useful information and correlations from huge datasets built from experiments at different length scales and in heterogeneous conditions. These predictive methods are illustrated in the context of cheese ripening, grape maturity prediction and bacterial production.
Published: 2018

15. Multiscale computational homogenization of heterogeneous shells at small strains with extensions to finite displacements and buckling

Author: Hamid Zahrouni, Y. Cong, Saeid Nezamabadi, and Julien Yvonnet
Subjects: Physics, Numerical Analysis, business.industry, Applied Mathematics, SHELL model, Mathematical analysis, General Engineering, 02 engineering and technology, Structural engineering, Strain gradient, 01 natural sciences, Homogenization (chemistry), Small strain, 010101 applied mathematics, 020303 mechanical engineering & transports, 0203 mechanical engineering, Buckling, Macroscopic scale, Boundary value problem, 0101 mathematics, business
Abstract: In this paper, a framework for computational homogenization of shell structures is proposed in the context of small strain elastostatics, with extensions to large displacements and large rotations. At the macroscopic scale, heterogeneous thin structures are modeled using a homogenized shell model, based on a versatile three-dimensional 7-parameter shell formulation, incorporating a through-thickness and pre-integrated constitutive relationship. In the context of small strains, we show that the local solution on the elementary cell can be decomposed into 6 strain and 6 strain gradient modes, associated with corresponding boundary conditions. The heterogeneities can have arbitrary morphology, but are assumed to be periodically distributed in the tangential direction of the shell. We then propose an extension of the small strain framework to geometrical nonlinearities. The procedure is purely sequential and does not involve coupling between scales. The homogenization method is validated and illustrated through examples involving large displacements and buckling of heterogeneous plates and shells.
Published: 2015

16. Cohesive strength of iron ore granules

Author: Jean-Yves Delenne, Edouard Izard, Jean-François Douce, Emilien Azéma, Frédéric van Loo, Rafael Antonio Jaimes Contreras, Saeid Nezamabadi, Alexey Koltsov, Roland J.-M. Pellenq, Nicolas Berger, Farhang Radjai, Centre for research in Metallurgy ( CRM Group ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Multiscale Materials Science for Energy and Environment ( MSE2 ), Massachusetts Institute of Technology ( MIT ) -Centre National de la Recherche Scientifique ( CNRS ), R&D Maizières, ArcelorMittal, Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Centre for research in Metallurgy (CRM Group), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), ArcelorMittal Maizières Research SA, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: structure granulaire, hématite, internal cohesion, Capillary action, [SDV]Life Sciences [q-bio], QC1-999, Dispersity, granular structure, 01 natural sciences, 010305 fluids & plasmas, fer, iron, 0103 physical sciences, Cohesion (geology), force de compression, Composite material, 010306 general physics, Range (particle radiation), [ SDV ] Life Sciences [q-bio], Physics, Granule (cell biology), haematite, Hematite, Compression (physics), cohésion interne, Engineering physics, Compressive strength, visual_art, visual_art.visual_art_medium, minerai
Abstract: International audience; We present an experimental and numerical investigation of the mechanical strength of crude iron ore (Hematite) granules in which capillary bonds between primary particles are the source of internal cohesion. The strength is measured by subjecting the granules to vertical compression between two plates. We show that the behavior of the granules is ductile with a well-defined plastic threshold which increases with the amount of water. It is found that the compressive strength scales with capillary cohesion with a pre-factor that is nearly independent of size polydispersity for the investigated range of parameters but increases with friction coefficient between primary particles. This weak dependence may be attributed to the class of fine particles which, due to their large number, behaves as a cohesive matrix that controls the strength of the granule.
Published: 2017

17. Highly deformed grain: from the Hertz contact limitation to a new strain field description in 2D

Author: Jonathan Barés, Thi-Lo Vu, Serge Mora, Saeid Nezamabadi, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Digital image correlation, Field (physics), QC1-999, 02 engineering and technology, Mechanics, Edge (geometry), [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], 021001 nanoscience & nanotechnology, Granular material, 01 natural sciences, Measure (mathematics), 010305 fluids & plasmas, Hertz, 0103 physical sciences, Particle, Statistical physics, Deformation (engineering), 0210 nano-technology
Abstract: International audience; Most of the 2D studies on granular materials consider an assembly of cylindrical particles in the small deformation regime. Investigating the range of validity of the small deformation hypothesis is therefore of crucial importance in order to determine the quantitative relevance of the predictions emerging from these 2D studies. We introduce here a novel experimental setup based on high resolution imaging and image correlation, and capable of measuring the strain field inside the particles with a cutting edge accuracy. We measure the strain field inside a unique circular cylindrical elastic particle undergoing an uniaxial compression. The significant deviations arising from the comparison with the predictions of the small deformation limit predicted by the Hertz's theory, and numerical simulations, give insight to improve the modeling of 2D granular materials.
Published: 2017

18. Compaction of granular materials composed of deformable particles

Author: Saeid Nezamabadi, Thanh Hai Nguyen, Jean-Yves Delenne, Farhang Radjai, University of Science and Technology, University of Danang, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Multiscale Materials Science for Energy and Environment ( MSE2 ), Massachusetts Institute of Technology ( MIT ) -Centre National de la Recherche Scientifique ( CNRS ), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: Materials science, QC1-999, [SDV]Life Sciences [q-bio], Compaction, Nanotechnology, produit granulaire, 02 engineering and technology, Granular material, 01 natural sciences, 010305 fluids & plasmas, strain, 0103 physical sciences, propriété mécanique, Contact dynamics, Composite material, comportement élastique, Material point method, Aggregate (composite), [ SDV ] Life Sciences [q-bio], mechanical characteristic, Physics, 021001 nanoscience & nanotechnology, Microstructure, Particle, Particle size, 0210 nano-technology, déformation mécanique
Abstract: In soft particle materials such as metallic powders the particles can undergo large deformations without rupture. The large elastic or plastic deformations of the particles are expected to strongly affect the mechanical properties of these materials compared to hard particle materials more often considered in research on granular materials. Herein, two numerical approaches are proposed for the simulation of soft granular systems: (i) an implicit formulation of the Material Point Method (MPM) combined with the Contact Dynamics (CD) method to deal with contact interactions, and (i) Bonded Particle Model (BPM), in which each deformable particle is modeled as an aggregate of rigid primary particles using the CD method. These two approaches allow us to simulate the compaction of an assembly of elastic or plastic particles. By analyzing the uniaxial compaction of 2D soft particle packings, we investigate the effects of particle shape change on the stress-strain relationship and volume change behavior as well as the evolution of the microstructure.
Published: 2017

19. MPM with frictional contact for application to soft particulate materials

Author: Thanh Hai Nguyen, Jean-Yves Delenne, Julien Averseng, Farhang Radjai, Saeid Nezamabadi, Xavier Frank, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Structures Innovantes, Géomatériaux, ECOconstruction (SIGECO), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: structure granulaire, Materials science, granular materials, material point method, Mechanics of materials, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], modèle de simulation, Granular material, Atomic packing factor, 01 natural sciences, 010305 fluids & plasmas, Stress (mechanics), conditionnement, 0103 physical sciences, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Contact dynamics, Soft matter, Composite material, 010306 general physics, Anisotropy, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Material point method, Engineering(all), Granular materials, soft matter, frottement, résistance à la compression, General Medicine, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], particule alimentaire, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], particule solide, contact dynamics, Particle, Mécanique des matériaux, anisotropie des structures
Abstract: Proceedings of the 1st International Conference on the Material Point Method (MPM 2017); International audience; Soft particle materials are composed of discrete particles that can undergo large deformations without rupture. Most food products, many powders, colloidal pastes, vesicles and biological cells are soft particle systems. In order to model such materials, we present an efficient numerical approach combining an implicit formulation of the Material Point Method (MPM) and Contact Dynamics (CD) method. The MPM deals with bulk variables of an individual particle by discretizing it as a collection of material points, whereas the CD allows for the treatment of frictional contacts between particles. This model is applied for the simulation of the uniaxial compression of 2D soft-particle packings. The compaction is a nonlinear process in which new contacts are formed between particles and the contact areas increase. The change of particle shapes allows these materials to reach high packing fraction. We find that the contact specific surface, the orientation anisotropy and the aspect ratio of particles increase as a function of the packing fraction but at different rates. We also evidence the effect of friction, which favors strong stress chains and thus the elongation of particles, leading to larger values of the orientation anisotropy and the aspect ratio at a given level of packing fraction as compared to a frictionless particle packing.
Published: 2017

20. Analysis of dense packing of highly deformed grains

Author: Saeid Nezamabadi, Jonathan Barés, Thi-Lo Vu, Serge Mora, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Moyens expérimentaux (Servex)
Subjects: Materials science, Physics, QC1-999, Uniaxial compression, Context (language use), 02 engineering and technology, Mechanics, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Granular material, Atomic packing factor, 01 natural sciences, 010101 applied mathematics, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Finite strain theory, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Contact dynamics, Statistical physics, 0101 mathematics, 0210 nano-technology, Dense packing, Material point method
Abstract: International audience; This paper concerns modeling of soft granular materials in which the grains are highly deformable. In order to simulate these materials, an approach based on an implicit formulation of the Material Point Method in the context of the finite strain theory, allowing for large deformations of grains, coupled with the Contact Dynamics method for the treatment of unilateral frictional contacts between grains, is proposed. In this context, the Mooney-Rivlin constitutive relationship is applied with two different set of elastic parameters. Considering these two material behaviors, a uniaxial compression of 2D soft granular packings is analyzed. The stress-strain relation and the evolution of the packing fraction as well as of the connectivity of the grains are discussed.
Published: 2017

21. Modeling soft granular materials

Author: Thanh Hai Nguyen, Farhang Radjai, Jean-Yves Delenne, Saeid Nezamabadi, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Water Resources Engineering Department, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Physique et Mécanique des Milieux Divisés ( PMMD ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: Materials science, General Physics and Astronomy, [ SPI.MECA.STRU ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], Material point method, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Granular material, Atomic packing factor, 01 natural sciences, 010305 fluids & plasmas, Discrete element method, Stress (mechanics), Contact dynamics, 0103 physical sciences, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MSMECA ] Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], General Materials Science, Soft matter, Composite material, 010306 general physics, Elasto-plastic behavior, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Granular materials, Linear elasticity, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], Mechanics of Materials, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
Abstract: International audience; Soft-grain materials such as clays and other colloidal pastes share the common feature of being composed of grains that can undergo large deformations without rupture. For the simulation of such materials, we present two alternative methods: (1) an implicit formulation of the material point method (MPM), in which each grain is discretized as a collection of material points, and (2) the bonded particle model (BPM), in which each soft grain is modeled as an aggregate of rigid particles using the contact dynamics method. In the MPM, a linear elastic behavior is used for the grains. In order to allow the aggregates in the BPM to deform without breaking, we use long-range center-to-center attraction forces between the primary particles belonging to each grain together with steric repulsion at their contact points. We show that these interactions lead to a plastic behavior of the grains. Using both methods, we analyze the uniaxial compaction of 2D soft granular packings. This process is nonlinear and involves both grain rearrangements and large deformations. High packing fractions beyond the jamming state are reached as a result of grain shape change for both methods. We discuss the stress-strain and volume change behavior as well as the evolution of the connectivity of the grains. Similar textures are observed at large deformations although the BPM requires higher stress than the MPM to reach the same level of packing fraction.
Published: 2017

22. Cellular instabilities analyzed by multi-scale Fourier series: A review

Author: Michel Potier-Ferry, Fan Xu, Noureddine Damil, Heng Hu, Foudil Mohri, Bouazza Braikat, Khadija Mhada, Qun Huang, Saeid Nezamabadi, Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Department of Mechanics and Engineering Science, Fudan University [Shanghai], Laboratoire d'Ingénierie et Matériaux [Casablanca] (LIMAT), Faculté des Sciences Ben M'sik [Casablanca], Université Hassan II [Casablanca] (UH2MC)-Université Hassan II [Casablanca] (UH2MC), School of Civil Engineering, Wuhan University [China], Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and ANR-11-LABX-0008,DAMAS,Design des Alliages Métalliques pour Allègement des Structures(2011)
Subjects: Partial differential equation, Scale (ratio), Applied Mathematics, Mathematical analysis, Pattern formation, slowly variable Fourier coefficients, 02 engineering and technology, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Instability, Finite element method, 020303 mechanical engineering & transports, 0203 mechanical engineering, Multi-scale models, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], bifurcation, Discrete Mathematics and Combinatorics, wrinkling, 0210 nano-technology, Fourier series, Analysis, Bifurcation, Mathematics, Variable (mathematics)
Abstract: International audience; The paper is concerned by multi-scale methods to describe instability pattern formation, especially the method of Fourier series with variable coefficients. In this respect, various numerical tools are available. For instance in the case of membrane models, shell finite element codes can predict the details of the wrinkles, but with difficulties due to the large number of unknowns and the existence of many solutions. Macroscopic models are also available, but they account only for the effect of wrinkling on membrane behavior. A Fourier-related method has been introduced in order to modelize the main features of the wrinkles, but by using partial differential equations only at a macroscopic level. Within this method, the solution is sought in the form of few terms of Fourier series whose coefficients vary more slowly than the oscillations. The recent progresses about this Fourier-related method are reviewed and discussed.
Published: 2016

23. Implicit frictional-contact model for soft particle systems

Author: Saeid Nezamabadi, Jean-Yves Delenne, Julien Averseng, Farhang Radjai, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), UMI 3466 MSE, Multi-Scale Materials Science for Energy and Environment, Massachusetts Institute of Technology (MIT), Structures Innovantes, Géomatériaux, ECOconstruction (SIGECO), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Massachusetts Institute of Technology ( MIT ), Structures Innovantes, Géomatériaux, ECOconstruction ( SIGECO ), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Subjects: Particle system, Granular materials, Materials science, business.product_category, Mechanical Engineering, Compaction, Jamming, Material point method, Mechanics, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Condensed Matter Physics, Granular material, Classical mechanics, Contact dynamics, Mechanics of Materials, Regularization (physics), [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Inclined plane, business, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Soft-particle systems
Abstract: International audience; We introduce a novel numerical approach for the simulation of soft particles interacting via frictional contacts. This approach is based on an implicit formulation of the Material Point Method, allowing for large particle deformations, combined with the Contact Dynamics method for the treatment of unilateral frictional contacts between particles. This approach is both precise due to the treatment of contacts with no regularization and artificial damping parameters, and robust due to implicit time integration of both bulk degrees of freedom and relative contact velocities at the nodes representing the contact points. By construction, our algorithm is capable of handling arbitrary particle shapes and deformations. We illustrate this approach by two simple 2D examples: a Hertz contact and a rolling particle on an inclined plane. We also investigate the compaction of a packing of circular particles up to a solid fraction well above the jamming limit of hard particles. We find that, for the same level of deformation, the solid fraction in a packing of frictional particles is above that of a packing of frictionless particles as a result of larger particle shape change.
Published: 2015

24. Compressive failure of composites: A computational homogenization approach

Author: Hamid Zahrouni, Michel Potier-Ferry, Julien Yvonnet, Saeid Nezamabadi, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et mécanique des matériaux (LPMM), Université Paul Verlaine - Metz (UPVM)-Institut National Polytechnique de Lorraine (INPL)-Ecole Nationale d'Ingénieurs de Metz (ENIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM), ANR-11-LABX-0008-01, Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)
Subjects: Materials science, Nonlinear homogenization, Composite number, Macroscopic model, 02 engineering and technology, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], Homogenization (chemistry), 0203 mechanical engineering, Asymptotic numerical method, A fibers, Composite material, Long fiber composite, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Civil and Structural Engineering, Microbuckling, Finite element approach, Loss of ellipticity, 021001 nanoscience & nanotechnology, Finite element method, 020303 mechanical engineering & transports, Buckling, Multiscale finite element method, Ceramics and Composites, Compressive failure, 0210 nano-technology
Abstract: International audience; This paper revisits the modeling of compressive failure of long fiber composite materials by considering a multiscale finite element approach. It is well known that this failure follows from a fiber microbuckling phenomenon. Fiber microbuckling is governed by both material and geometrical quantities: the elastoplastic shear behavior of the matrix and the fiber misalignment. Although all these parameters are easily accounted by a finite element analysis at the local level, the failure is also influenced by macrostructural quantities. That is why a multilevel finite element model (FE²) is relevant to describe the compressive failure of composite. Furthermore, fiber local buckling leads to a loss of ellipticity of the macroscopic model, which can be a criterion of failure.
Published: 2015

25. Strength of wet agglomerates of spherical particles: effects of friction and size distribution

Author: Thanh-Trung Vo, Saeid Nezamabadi, Farhang Radjai, Jean-Yves Delenne, Patrick Mutabaruka, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Bridge and Road Department, University of Danang, Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Multiscale Materials Science for Energy and Environment ( MSE2 ), Massachusetts Institute of Technology ( MIT ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)
Subjects: Friction coefficient, Materials science, [ SDV ] Life Sciences [q-bio], Capillary action, Physics, QC1-999, [SDV]Life Sciences [q-bio], 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, 010305 fluids & plasmas, Molecular dynamics, Compressive strength, Classical mechanics, Agglomerate, 0103 physical sciences, Cohesion (chemistry), Particle size, Composite material, 0210 nano-technology
Abstract: We investigate the mechanical behavior of wet granular agglomerates composed of spherical particles by means of molecular dynamics simulations. The capillary cohesion force is modeled as an attraction force at the contact between two particles and expressed as an explicit function of the gap and volume of the liquid bridge. We are interested in the effect of the friction coefficient between primary particles. The agglomerates are subjected to diametrical compression tests. We find that the deformation is ductile involving particle rearrangements. However, a well-defined stress peak is observed and the peak stress is used as a measure of the compressive strength of the agglomerate. The strength increases with friction coefficient but levels off at friction coefficients above 0.4. Furthermore, the compressive strength is an increasing function of particle size span.
Published: 2017

26. A multiscale approach for the vibration analysis of heterogeneous materials: Application to passive damping

Author: El Mostafa Daya, Saeid Nezamabadi, Kodjo Attipou, Hamid Zahrouni, Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires (PMMG), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Acoustics and Ultrasonics, Characteristic length, media_common.quotation_subject, Modulus, 02 engineering and technology, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], Inertia, Viscoelasticity, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], 0203 mechanical engineering, medicine, Microscale chemistry, media_common, [PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], business.industry, Mechanical Engineering, Stiffness, [SPI.MECA.VIBR]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], Mechanics, Structural engineering, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Finite element method, Vibration, 020303 mechanical engineering & transports, Mechanics of Materials, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], medicine.symptom, 0210 nano-technology, business
Abstract: International audience; This paper presents a multiscale numerical technique for vibration analysis of hetero-geneous materials. In this procedure, the unknownmacroscopic constitutive relationship is searched by solving a local finite element problem at the microscale. Since the inertia effects areneglected at the microscopic level, this approach is limited to problems in which microstructure characteristic length is smaller than thewavelength. Numerical examples are limited to free vibration analysis of viscoelastic materials with a constant complex modulus. Theseexamples allow one to validate the multiscale approach and to study the influence of different parameters on the passive damping of thestructure. These parameters concern the morphology, the stiffness ratio and the inclusion volume fraction.
Published: 2013

27. Solving hyperelastic material problems by asymptotic numerical method

Author: Julien Yvonnet, Saeid Nezamabadi, Hamid Zahrouni, Conception en structures (CS), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)
Subjects: Computational Mechanics, Ocean Engineering, 02 engineering and technology, 01 natural sciences, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], 0203 mechanical engineering, 0101 mathematics, Special case, ComputingMilieux_MISCELLANEOUS, Mathematics, Applied Mathematics, Mechanical Engineering, Numerical analysis, Mathematical analysis, Tangent, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], 010101 applied mathematics, Linear map, Computational Mathematics, Nonlinear system, 020303 mechanical engineering & transports, Computational Theory and Mathematics, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Hyperelastic material, Limit point, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Mechanics of the structures [physics.class-ph], Compressibility
Abstract: This paper presents a numerical algorithm based on a perturbation technique named asymptotic numerical method (ANM) to solve nonlinear problems with hyperelastic constitutive behaviors. The main advantages of this technique compared to Newton---Raphson are: (a) a large reduction of the number of tangent matrix decompositions; (b) in presence of instabilities or limit points no special treatment such as arc-length algorithms is necessary. The ANM uses high order series approximation with auto-adaptive step length and without need of any iteration. Introduction of this expansion into the set of nonlinear equations results into a sequence of linear problems with the same linear operator. The present work aims at providing algorithms for applying the ANM to the special case of compressible and incompressible hyperelastic materials. The efficiency and accuracy of the method are examined by comparing this algorithm with Newton---Raphson method for problems involving hyperelastic structures with large strains and instabilities.
Published: 2011

28. A multilevel computational strategy for handling microscopic and macroscopic instabilities

Author: Saeid Nezamabadi, Julien Yvonnet, Hamid Zahrouni, Michel Potier-Ferry, Laboratoire de physique et mécanique des matériaux (LPMM), Université Paul Verlaine - Metz (UPVM)-Institut National Polytechnique de Lorraine (INPL)-Ecole Nationale d'Ingénieurs de Metz (ENIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Structures et des Systèmes Couplés (LMSSC), Conservatoire National des Arts et Métiers [CNAM] (CNAM), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM)
Subjects: Mechanical Engineering, Constitutive equation, Computational Mechanics, General Physics and Astronomy, 02 engineering and technology, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], 01 natural sciences, Homogenization (chemistry), Instability, Finite element method, Computer Science Applications, 010101 applied mathematics, Nonlinear system, 020303 mechanical engineering & transports, Classical mechanics, 0203 mechanical engineering, Mechanics of Materials, Limit point, Statistical physics, 0101 mathematics, Microscale chemistry, Numerical stability, Mathematics
Abstract: International audience; This paper presents a numerical technique to deal with instability phenomena in the context of heterogeneous materials where buckling may occur at both macroscopic and/or microscopic scales. We limit ourselves to elastic materials but geometrical nonlinearity is taken into account at both scales. The proposed approach combines the multilevel finite element analysis (FE2) and the asymptotic method (ANM). In that framework, the unknown nonlinear constitutive relationship at the macroscale is found by solving a local finite element problem at the microscale. In contrast with FE2, the use of the asymptotic development allows to transform the nonlinear microscopic problems into a sequence of linear problems. Thus, a direct analogy with classical linear homogenization can be made to construct a localisation tensor at each step of the asymptotic development, and an explicit macroscopic constitutive relationship can be constructed at each step. Furthermore, the salient features of the ANM allow treating instabilities and limit points in a very simple way at both scales. The method is tested and illustrated through numerical examples involving local instabilities which have ignificant influence on the macroscopic behavior.
Published: 2009

29. A multiscale finite element approach for buckling analysis of elastoplastic long fiber composites

Author: Julien Yvonnet, Michel Potier-Ferry, Saeid Nezamabadi, Hamid Zahrouni, Laboratoire de physique et mécanique des matériaux (LPMM), Université Paul Verlaine - Metz (UPVM)-Institut National Polytechnique de Lorraine (INPL)-Ecole Nationale d'Ingénieurs de Metz (ENIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM), and Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Computer Networks and Communications, Constitutive equation, asymptotic numerical method, Computational Mechanics, 02 engineering and technology, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], 01 natural sciences, Displacement (vector), Matrix (mathematics), 0203 mechanical engineering, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 0101 mathematics, Composite material, multiscale finite element method, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], Numerical analysis, [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], Finite element method, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], 010101 applied mathematics, Stress field, Nonlinear system, 020303 mechanical engineering & transports, Buckling, Control and Systems Engineering, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], plastic microbuckling, nonlinear homogenization, long fiber composite
Abstract: International audience; The present work is devoted to the microbuckling analysis of long fiber composites. A multiscale finite element method (FE2) is combined with the asymptotic numerical method (ANM) to study the elastoplastic instability which may occur in structures at both macroscopic and microscopic scales. The fiber is described by a linear material constitutive law, while the matrix phase is described by a nonlinear Ramberg-Osgood relationship. The stress field is then obtained via the total mechanical strain without any history dependence. Large strains are considered, which induce geometrical nonlinearities in both cases. The ANM framework allows obtaining complex response curves involving limit points in loading and displacement to be obtained. In the present path following procedure, adjustment of the step length is naturally automatic because the validity range of the asymptotic solution is a posteriori estimated depending on the local nonlinearity of the response branches. Numerical examples show the effectiveness of the proposed approach by investigating microscopic and macroscopic instabilities of long fiber composite structures in compression.

30. Modeling the rheology of wet granular materials

Author: Vo, Thanh Trung, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier, Farhang Radjaï, Jean-Yves Delenne, and Saeid Nezamabadi
Subjects: Agglomération, Matière granulaire, Agglomeration, Dem, Granular matter, Pont capillaire, Rheology, Capillary bridge, Rhéologie, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: By means of extensive particle dynamics simulations in three dimensions, we investigate the rheology and agglomeration process of granular materials such as wet powders, which involve cohesive and viscous interactions in addition to frictional contact forces. In shear flow simulations, we show that the flow variables such as effective friction coefficient and packing fraction and texture variables such as coordination number and anisotropy can be described as a function of a single dimensionless number that incorporates the inertial, cohesive and viscous forces. We also study the evolution of an agglomerate inside a granular shear flow of dry particles and in a rotating drum containing wet particles. The evolution of the agglomerate depends on the accretion and erosion dynamics, which are governed by cohesive interactions. We determine the phase-space diagrams in terms of the agglomerate growth, deformation, damage and erosion as a function of the cohesion index and inertial number. The compressive strength of the agglomerates is also investigated under diametral compression and shown to be proportional to the adhesion force between the particles with a pre-factor that depends on the connectivity of the primary particles.; Dans cette thèse essentiellement numérique, nous avons étudié la rhéologie et le processus d'agglomération de matériaux granulaires humides impliquant des interactions cohésives et visqueuses venant s’ajouter à celles de contact-frottant. Des écoulements en cisaillement, simulés par une approche de type éléments discrets 3D, nous ont permis de montrer que les variables caractérisant le comportement (coefficient de frottement effectif et compacité) ainsi que celles décrivant la texture (nombre de coordination et anisotropie) peuvent être décrites comme fonction d'un unique nombre sans dimension; incorporant les forces inertielles, cohésives et visqueuses. Nous nous sommes également intéressés à l'évolution d'un agglomérat à l'intérieur d'un écoulement de particules sèches cisaillées ainsi que dans un tambour rotatif contenant des particules humides. Il a été montré que l’évolution de l'agglomérat dépend de la dynamique d'accrétion et d’érosion et que celle-ci est régies par les interactions cohésives. Des diagrammes de phase en termes de croissance, de déformation, d'endommagement et d’érosion sont présentés en fonction de l'indice de cohésion et du nombre inertiel. Enfin, la résistance à la compression des agglomérats a été également étudiée sous compression diamétrale. On montre qu’elle est proportionnelle à la force d’adhésion entre particules avec un pré-facteur qui dépend de la connectivité des particules primaires.
Published: 2019

31. Modélisation de la rhéologie des matériaux granulaires humides

Author: Vo, Thanh Trung, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier, Farhang Radjaï, Jean-Yves Delenne, and Saeid Nezamabadi
Subjects: Agglomération, Matière granulaire, Agglomeration, Dem, Granular matter, Pont capillaire, Rheology, Capillary bridge, Rhéologie, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: By means of extensive particle dynamics simulations in three dimensions, we investigate the rheology and agglomeration process of granular materials such as wet powders, which involve cohesive and viscous interactions in addition to frictional contact forces. In shear flow simulations, we show that the flow variables such as effective friction coefficient and packing fraction and texture variables such as coordination number and anisotropy can be described as a function of a single dimensionless number that incorporates the inertial, cohesive and viscous forces. We also study the evolution of an agglomerate inside a granular shear flow of dry particles and in a rotating drum containing wet particles. The evolution of the agglomerate depends on the accretion and erosion dynamics, which are governed by cohesive interactions. We determine the phase-space diagrams in terms of the agglomerate growth, deformation, damage and erosion as a function of the cohesion index and inertial number. The compressive strength of the agglomerates is also investigated under diametral compression and shown to be proportional to the adhesion force between the particles with a pre-factor that depends on the connectivity of the primary particles.; Dans cette thèse essentiellement numérique, nous avons étudié la rhéologie et le processus d'agglomération de matériaux granulaires humides impliquant des interactions cohésives et visqueuses venant s’ajouter à celles de contact-frottant. Des écoulements en cisaillement, simulés par une approche de type éléments discrets 3D, nous ont permis de montrer que les variables caractérisant le comportement (coefficient de frottement effectif et compacité) ainsi que celles décrivant la texture (nombre de coordination et anisotropie) peuvent être décrites comme fonction d'un unique nombre sans dimension; incorporant les forces inertielles, cohésives et visqueuses. Nous nous sommes également intéressés à l'évolution d'un agglomérat à l'intérieur d'un écoulement de particules sèches cisaillées ainsi que dans un tambour rotatif contenant des particules humides. Il a été montré que l’évolution de l'agglomérat dépend de la dynamique d'accrétion et d’érosion et que celle-ci est régies par les interactions cohésives. Des diagrammes de phase en termes de croissance, de déformation, d'endommagement et d’érosion sont présentés en fonction de l'indice de cohésion et du nombre inertiel. Enfin, la résistance à la compression des agglomérats a été également étudiée sous compression diamétrale. On montre qu’elle est proportionnelle à la force d’adhésion entre particules avec un pré-facteur qui dépend de la connectivité des particules primaires.
Published: 2019

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31 results on '"Saeid Nezamabadi"'

1. Additive rheology of complex granular flows

2. Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

3. Parallel implicit contact algorithm for soft particle systems.

4. Deformation Field in Diametrically Loaded Soft Cylinders

5. Modelling the compaction of plastic particle packings

6. Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

7. Evolution of wet agglomerates inside inertial shear flow of dry granular materials

8. Parallel implicit contact algorithm for soft particle systems

9. Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

10. Agglomeration of wet particles in dense granular flows

11. Effects of particle compressibility on structural and mechanical properties of compressed soft granular materials

12. Rheology of soft granular materials: uniaxial compression

13. Mechanical strength of wet particle agglomerates

14. Multiscale modeling for bioresources and bioproducts

15. Multiscale computational homogenization of heterogeneous shells at small strains with extensions to finite displacements and buckling

16. Cohesive strength of iron ore granules

17. Highly deformed grain: from the Hertz contact limitation to a new strain field description in 2D

18. Compaction of granular materials composed of deformable particles

19. MPM with frictional contact for application to soft particulate materials

20. Analysis of dense packing of highly deformed grains

21. Modeling soft granular materials

22. Cellular instabilities analyzed by multi-scale Fourier series: A review

23. Implicit frictional-contact model for soft particle systems

24. Compressive failure of composites: A computational homogenization approach

25. Strength of wet agglomerates of spherical particles: effects of friction and size distribution

26. A multiscale approach for the vibration analysis of heterogeneous materials: Application to passive damping

27. Solving hyperelastic material problems by asymptotic numerical method

28. A multilevel computational strategy for handling microscopic and macroscopic instabilities

29. A multiscale finite element approach for buckling analysis of elastoplastic long fiber composites

30. Modeling the rheology of wet granular materials

31. Modélisation de la rhéologie des matériaux granulaires humides

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31 results on '"Saeid Nezamabadi"'

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