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48 results on '"Pagano, Stéphane"'

11. Identification of heterogeneous elasto-plastic behaviors using the Constitutive Equation Gap Method

Author

Madani, Tarik, Monerie, Yann, Pagano, Stéphane, Pélissou, Céline, Wattrisse, Bertrand, Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), 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), Mathématiques et Modélisations en Mécanique (M3), and Institut de Radioprotection et de Sûreté Nucléaire (IRSN)

Subjects
Full field measurement, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Material identification, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Elastoplasticity, Inverse method, [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]
Abstract

International audience; Recent developments in imaging techniques now facilitate local field measurements (e.g. strain, temperature, etc.). In this study, we identify the spatial distribution of material properties and local stress fields using an inverse identification method based on the constitutive equation gap (CEG). The CEG concept is based both on minimization of a cost function equal to the sum of the potential and complementary energies, and on the deviation between the measured and computed strain fields. We propose a new approach for identifying heterogeneous property fields (mechanical parameters and stress) using a secant elastoplastic tensor and a measured strain field obtained by full-field measurement. The reliability of the method is checked using finite element simulation data as reference full-field measurements. The method is then applied on noisy displacement fields to assess its robustness. Finally, the developed inverse method is tested on real measured data.

Published
2018

14. Modeling of the effective elastic behavior of nanoporous materials with spherical and ellipsoidal in shape bubbles: application to irradiated uranium dioxide

Author

Haller , Xavier, Monerie , Yann, Pagano , Stéphane, Vincent , Pierre-Guy, Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Mathématiques et Modélisations en Mécanique ( M3 ), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Mathématiques et Modélisations en Mécanique (M3)

Subjects
[ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [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], [ SPI.MECA.MSMECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph]
Abstract

International audience; This work is devoted to the modeling of the effective elastic behavior of nanoporous materials containing both spherical and ellipsoidal in shape bubbles, typically the irradiated uranium dioxide (UO2) studied by the French “Institut de Radioprotection et de Sûreté Nucléaire” to investigate the response of fuel rods under reactivity initiated accident (RIA) conditions. As a first approximation, this material exhibits at least two populations of bubbles: (1) intragranular bubbles, almost spherical in shape with a typical diameter of a few nanometers, (2) intergranular bubbles, roughly lenticular in shape whose size ranges from tens to several hundred nanometers. Molecular dynamics results of [Colbert, 2012] and [Jelea et al., 2011] show the existence of a non-neglectible surface effect on the effective elastic behavior for UO2 at the intragranular bubbles scale, particularly when the surface/volume ratio of these bubbles increases.Analytical micromechanical models ([Duan et al., 2005], [Brisard et al., 2010]) concerning materials with an isotropic distribution of nano-sized spherical inclusions have been extended to the case of materials with two populations of pressurized bubbles, one relative to spherical bubbles and the other relative to ellipsoidal bubbles. The proposed model follows the general framework of the so-called ‘morphologically representative pattern-based approach’ of [Stolz and Zaoui, 1991] and is compared to existing models (with or without surface effects). The relevance of the analytical model has been assessed by comparison with finite elements simulations. A preliminary study has been performed on the evolution of the elastic moduli of the irradiated UO2 fuel obtained from this model during a RIA test condition.

Published
2016

15. Identification of heterogeneous elastoplastic materials by Constitutive Equation Gap Method

Author

Madani, Tarik, Monerie, Yann, Pagano, Stéphane, Pélissou, Céline, Wattrisse, Bertrand, ThermoMécanique des Matériaux (ThM2), 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 de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Mathématiques et Modélisations en Mécanique (M3), and Institut de Radioprotection et de Sûreté Nucléaire (IRSN)

Subjects
Identification, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Digital Image Correlation, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Constitutive Equation Gap, Elastoplasticity, [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]
Abstract

International audience; A strategy for identifying the shape and the parameters of elastoplastic laws in heterogeneous material is proposed here. It allows the local characterization of both mechanical properties and stress fields. This method relies on the constitutive equation gap principles and on the measurement of overall loads and strain fields. These fields are obtained by the numerical differentiation of displacement fields measured by Digital Image Correlation. The identification method is based on the iterative minimization of an energy norm involving the secant elastoplastic tensor. We propose here to characterize the robustness of the method and its stability (to noise, initial parameters and mesh) on numerical data sets obtained on numerically-deformed images. Finally, we illustrate the ability of the method to identify the local material properties of a heterogeneous material on real experimental data.

Published
2016

16. Experimental identification of thermo-mechanical cohesive zone models for complex loading

Author

Madani , Tarik, Monerie , Yann, Pagano , Stéphane, Pelissou , Céline, Wattrisse , Bertrand, Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), Mathématiques et Modélisations en Mécanique ( M3 ), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), and Mathématiques et Modélisations en Mécanique (M3)

Subjects
[ SPI.MECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]
Abstract

National audience; The objective is the identification of cohesive zone models for heterogeneous materials, using the inverse method and measuring thermomechanical imaging techniques

Published
2015

17. Identification of heterogeneous elastoplastic behaviors using DIC measurements

Author

Madani, Tarik, Monerie, Yann, Pagano, Stéphane, Pelissou, Céline, Wattrisse, Bertrand, Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Mathématiques et Modélisations en Mécanique ( M3 ), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), ThermoMécanique des Matériaux (ThM2), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), and Mathématiques et Modélisations en Mécanique (M3)

Subjects
[ SPI.MECA.GEME ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph], [ SPI.MECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], [ SPI.OPTI ] Engineering Sciences [physics]/Optics / Photonic, [ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processing, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [ SPI.MECA.MSMECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]
Abstract

International audience; The use of full-field measurements in the identification of material properties is currently widespread thanks to advances in measurements techniques and computer-assisted identification methods. In this paper, an iterative procedure is used to identify the local stress fields and the material properties distributions using full-field measurement techniques. After summarizing the principle of the method, we focus on its validation in which we identify an elastoplastic behavior. Then the method was applied on noisy measured displacement fields to assess its robustness.

Published
2015

18. Identification of heterogeneous elastoplastic behaviors using constitutive equation gap method

Author

Madani, Tarik, Monerie, Yann, Pagano, Stéphane, Pelissou, Céline, Wattrisse, Bertrand, Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Mathématiques et Modélisations en Mécanique ( M3 ), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), 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 Mathématiques et Modélisations en Mécanique (M3)

Subjects
Digital computer simulation, [ SPI.MECA.GEME ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph], Finite element method, Full field measurement, Material identification, Elastoplasticity, Inverse method, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC], Simulació per ordinador digital, [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]
Abstract

Cohesive zones models are commonly used in numerical simulations to take into account the onset and the propagation of microcracks leading to the fracture of materials. Their numerical implementation in finite element schemes is based on embedding surface traction-separation law between two adjacent bulk elements. The traction between two neighboring elements is linked to the corresponding opening by a cohesive relationship. The objective of the work reported here is to extend the approach developed in [1, 2] to identify the shape and parameters of the cohesive zone models in metal matrix composites with brittle inclusions and adapt this method to the study of initially heterogeneous material (e.g. graded metals or ceramics). To treat these applications where mechanical fields are heterogeneous, local stress fields are to be estimated in addition to conventional kinematic fields to build the energy balance associated with the transformation. Here we propose to estimate these fields by an identification method using kinematic and thermal data from imaging. The proposed method is based on the minimization of a functional associated with the error in constitutive relation (Constitutive equation gap method) [3]. In its classical (mechanical) formulation, this functional depends on two sets of parameters: the stress field and the mechanical material properties (elasticity, plasticity, damage). We show here that the identification procedure is capable to estimate the stress fields and material properties for elastic and elastoplastic behavior. The method was applied on noisy measured displacement fields to assess its robustness in the case of elastic behavior. The method is now being extended to damageable plasticity. The introduction of a second (calorimetric) term in the functional, related to the heat sources is also examined.

Published
2015

19. Effective elastic properties of bi-nanoporous materials

Author

Haller , Xavier, Monerie , Yann, Pagano , Stéphane, Vincent , Pierre-Guy, Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Mathématiques et Modélisations en Mécanique ( M3 ), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Mathématiques et Modélisations en Mécanique (M3)

Subjects
[ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [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], [ SPI.MECA.MSMECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph]
Abstract

International audience; This work is devoted to the theoretical modeling of the overall elastic properties of random nanoporous materials.Focussing on irradiated uranium dioxide (UO2) material-type studied by the French ”Institut de Radioprotectionet de Sˆuret´e Nucl´eaire” to investigate the response of fuel rods under accident conditions, we considernanomaterials exhibiting two populations of cavities at two different scales: 1/ small scale cavities almost sphericalin shape (radius r) with a typical diameter of a few nanometers, 2/ larger scale cavities roughly ellipsoidal inshape (major axis b and shape ratio w) with a typical size of a few microns. Recent molecular dynamics results [1]show the existence of a non-neglectible surface effect on the effective elastic behavior for uranium dioxide at thesmallest scale, particularly when the surface/volume ratio is drastically increasing.Analytical micromechanical [2, 3] models concerning materials with an isotropic distribution of nano-sizedspherical inclusions are extended here to the case of materials with two populations of voids. The spatial distributionis assumed to be generally ellipsoidal which is more general than the case of spherical and ellipsoidalcavities randomly distributed in space and in orientation. The proposed model follows the general framework ofthe so-called ’morphologically representative pattern approach’ [4] and is called Mori-Tanaka-Generalized (MTG)model. This model is compared to existing models (with or without surface effects). Particularly, the present modelallows a generalization of the Ponte Casta˜neda and Willis (PCW) model [5] to the case of porous media with surfaceeffects.

Published
2015

20. Effective elastic properties of nanoporous materials with spherical and ellipsoidal in shape voids

Author

Haller, Xavier, Monerie, Yann, Pagano, Stéphane, Vincent, Pierre-Guy, Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), ThermoMécanique des Matériaux ( ThM2 ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Mathématiques et Modélisations en Mécanique ( M3 ), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Mathématiques et Modélisations en Mécanique (M3)

Subjects
[ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

International audience; Voir fichier joint

Published
2014

21. Spectroscopie Ultrasonore Résonante, application à un matériau biologique anisotrope et hétérogène : le Bois

Author

Longo, Roberto, LAUX, Didier, Arnould, Olivier, Delaunay, Thomas, Pagano, Stéphane, Le Clezio, Emmanuel, Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux, MicroCapteurs et Acoustique (M2A), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil (LMGC), Mécanique de l'Arbre et du Bois (MAB), Modélisation Mathématique en Mécanique (M3), Labex NUMEV / Université Montpellier 2, Institut d’Electronique et des Systèmes ( IES ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Mécanique de l'Arbre et du Bois ( MAB ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), and Modélisation Mathématique en Mécanique ( M3 )

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [ SPI.ACOU ] Engineering Sciences [physics]/Acoustics [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.VIBR]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], [ SPI.MECA.VIBR ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2013

22. Phase property identification using inverse homogenization approaches and field measurements

Author

Vo Quoc, Thang, Duriez, Christian, Monerie, Yann, Pagano, Stéphane, Modélisation Mathématique en Mécanique ( M3 ), 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 de Radioprotection et de Sûreté Nucléaire ( IRSN ), Laboratoire de micromécanique et intégrité des structures ( MIST ), Institut de Radioprotection et de Sûreté Nucléaire ( IRSN ) -Centre National de la Recherche Scientifique ( CNRS ), Modélisation Mathématique en Mécanique (M3), 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 de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de micromécanique et intégrité des structures (MIST), and Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [ PHYS.MECA.SOLID ] Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph]
Abstract

International audience; In this paper, work is focused on two-phase matrix/inclusion composite materials. A simple method is pro- posed to identify the elastic properties of one phase while the properties of the other phase are assumed to be known. The method is based on both an inverse homogenization scheme and mechanical fields measurements. The originality of the approach rests on the studied scale: the characteristic size of the inclusions is about few tens of microns. The identification is performed on standard uniaxial tensile tests. First, the accuracy of the method is estimated on 'perfect' mechanical fields coming from numerical simulations for four microstructures: elastic or porous single inclusions having either spherical or cylindrical shape. Second, this accuracy is validated on real mechanical field for two simple microstruc- tures: an elasto-plastic metallic matrix containing a single cylindrical micro void or four cylindrical micro voids arranged in a square pattern. Third, the method is used to identify elastic properties of inclusions with arbitrary shape in an oxidized alpha-inclusions / beta-matrix Zircaloy-4 sample. In all this study, the phases are assumed to have isotropic properties.

Published
2013

23. The method of a floating frame of reference for non-smooth contact dynamics

Author

Lozovski , Alexander, Daridon , Loic, Dubois , Frédéric, Pagano , Stéphane, Modélisation Mathématique en Mécanique (M3), 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), Réseaux, Moyens Informatiques, Calcul Scientifique (Remics), Université Montpellier 2, Modélisation Mathématique en Mécanique ( M3 ), 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 Réseaux, Moyens Informatiques, Calcul Scientifique ( Remics )

Subjects
[ SPI.MECA.GEME ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph], multi-body dynamics, floating frame, velocity decomposition, [ PHYS.MECA.GEME ] Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [PHYS.MECA.GEME]Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph], non-smooth contact dynamics, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], discrete element method, [ PHYS.MECA.SOLID ] Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph], [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]
Abstract

A method of a floating frame of reference that performs splitting of a deformable solid into rigid and deforming parts is presented within the context of discrete element method. The decomposition is made in such a way that the deforming part of the velocity field does not contribute to the motion of the center of mass and to the rotational motion. The corresponding numerical method that computes both rigid and deforming motions is presented and extended to simulation of multi-body dynamics allowing non-smooth contact interactions, such as impacts and friction. Numerical experiments, where the method is compared with a more traditionally used Total Lagrangian method, justify its preference as a more efficient tool for the simulation of assemblies of stiff and massive objects.

Published
2013

24. Towards a new framework for building collaborative inter-firm relationships based on sustainable value

Author

Pagano, Stéphane, Derrouiche, Ridha, Neubert, Gilles, Neubert, Gilles, IFIP International Federation for Information Processing, Ecole Supérieure de Commerce de Saint-Etienne, ESC Saint Etienne, Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS), Environnement Ville Société (EVS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Lyon (ENSAL)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale des Travaux Publics de l'État (ENTPE)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Jean Moulin - Lyon 3 (UJML), and Université de Lyon-Université Lumière - Lyon 2 (UL2)-École normale supérieure - Lyon (ENS Lyon)

Subjects
industry ecosystems, ComputingMilieux_THECOMPUTINGPROFESSION, responsible supply chain, business models, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, Inter-firm collaboration, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Value creation
Abstract

International audience; After decades of industrial decline, the models of firm competitiveness, green economy, green growth, are making the news. Indeed, there is a growing trend in the reversal of outsourcing or offshoring production of goods and services while inter-firm relationships are under scrutiny. A trend being reinforced by the global awareness on resources scarcity, to integrate in the processes the impacts of climate change and eventually reduce them, to prepare for growing energy costs. The linear economy and it's models of value creation based on trading margins of imported, outsourced, goods and services, global competition between companies, resources spillage, has shown it's limits.

Published
2013

25. Collaboration et création de valeur : Vers un modèle de valorisation des relations clients-fournisseurs

Author

Pagano, Stéphane, Derrouiche, Ridha, Neubert, Gilles, Neubert, Gilles, Ecole Supérieure de Commerce de Saint-Etienne, ESC Saint Etienne, Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS), Environnement Ville Société (EVS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Lyon (ENSAL)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale des Travaux Publics de l'État (ENTPE)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Jean Moulin - Lyon 3 (UJML), and Université de Lyon-Université Lumière - Lyon 2 (UL2)-École normale supérieure - Lyon (ENS Lyon)

Subjects
Competitiveness, Compétitivité. Collaboration, Customer-supplier relationships, Création de Valeur, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Collaboration, Value creation, Relations clients-fournisseurs
Abstract

International audience; Résumé - À l'heure ou l'on parle de relocalisation et de compétitivité des entreprises, les relations intra et interentreprises font l'objet d'une attention particulière. Dans un environnement concurrentiel exacerbé par la mondialisation et la stagnation économique, les entreprises sont à la recherche de nouveaux modèles de création de valeur. Dans ce contexte, cet article propose les bases d'un nouveau modèle de valorisation des relations clients-fournisseurs. Celui-ci repose sur la création de valeur, la collaboration et la compétitivité hors prix, déclinés aux niveaux stratégique, tactique et opérationnel. Abstract - While reshoring and firm competitiveness are making the headlines, intra and inter-firm relationships are under scrutiny. In a globalized market under recession, firms are looking for new value creation models. This article presents the bases of a new model developing on customer-supplier relationships. It is built on value creation, collaboration and non-price competitiveness, deployed on strategic, tactical and operational levels.

Published
2013

26. Evaluation of numerical uncertainties on the modeling of dry masonry structures submitted to out-of-plane loading, using the NSCD method in comparison with experimental test

Author

Taforel, Paul, Dubois, Frédéric, Pagano, Stéphane, Modélisation Mathématique en Mécanique (M3), 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 Réseaux, Moyens Informatiques, Calcul Scientifique (Remics)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], numerical analysis, Discrete Element Method (DEM), 3D masonry structures, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], LMGC90, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [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]/Solid mechanics [physics.class-ph], Signorini-Coulomb condition, Non-Smooth Contacts Dynamic (NSCD)
Abstract

International audience; Masonry structures are one of the most common housing type built all around the world. Nonetheless computational methodologies implemented in classical engineering soft-ware seem not to be adapted to fine analysis of masonry structures. The Non-Smooth Contact Dynamics method developed by JJ Moreau and M Jean (the Dis-crete Element Method implemented in the software LMGC90) can perform the modeling of divided media and thus seem particularly well adapted to this type of computation. This work aims to better understand the behavior of the algorithm used in the LMGC90 soft-ware in the resolution of this kind of problems. The impact on the local and global behaviors of structures are considered and discussed. Both the notion of reliability of model and the no-tion of quality of the simulation are focused on. This work is particularly based on the comparison between experimental and numerical re-sults obtained with the LMGC90 software. The test consists in the modeling of a simple dry masonry structure placed on a tilting table. Three interaction laws are used to model the Sig-norini-Coulomb condition. The stability of the wall modeled with rigid bodies is studied re-garding with the influence of numerical parameters calibrating the Gauss-Seidel algorithm used to resolve such a multi-contact problem. Local behaviors are also considered as well as CPU effectiveness.

Published
2012

27. Two Dimensional Deterministic Model of a Thin Body with Micro High Stiffness Fibers Randomly Distributed

Author

Nait- Ali, Azdine, Michaille, Gérard, Pagano, Stéphane, Modélisation Mathématique en Mécanique (M3), 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 de Mathématiques et de Modélisation de Montpellier (I3M), and Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)

Subjects
asymptotic analysis, ergodic theory, Γ-convergence, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], technology, industry, and agriculture, homogenization, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

By using ergodic theory and a variational process, we study the macroscopic behavior of a thin body with micro hight stiffness fibers randomly distributed according to a stationary point process. The thickness of the body, the stiffness and the size of the cross sections of the fibers depend on a small parameter ε. The variational limit functional energy obtained when ε tends to 0 is deterministic and depends on two variables: one is the deformation of a two dimensional body and describes the behavior of the medium in the matrix, the other captures the limit behavior of deformations in the fibers when the thickness, the stiffness and the size section become increasingly thin.

Published
2012

28. Feedback on modeling issues of assemblies made of polyhedric objects through non smooth discrete element methods

Author

Taforel, Paul, Dubois, Frédéric, Martin, Alexandre, Mozul, Rémy, Pagano, Stéphane, Modélisation Mathématique en Mécanique (M3), 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 Réseaux, Moyens Informatiques, Calcul Scientifique (Remics)

Subjects
[PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [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]/Solid mechanics [physics.class-ph]
Abstract

International audience; Discrete element methods (DEM) constitute an important tool for the study of granular matter and divided materials or structures. Basically DEM model a material or a structure at the grain scale and are able to describe various complex behaviors (flow, localization of deformations, fracture, dissipation, etc) which can't be properly represented by continuum approach even with advanced constitutive model based on a huge number of parameters.

Published
2011

29. 10e colloque national en calcul des structures (CSMA 2011)

Author

Bonnet, Marc, Cornuault, Christian, Pagano, Stéphane, Propagation des Ondes : Étude Mathématique et Simulation (POEMS), Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Unité de Mathématiques Appliquées (UMA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-Centre National de la Recherche Scientifique (CNRS), Dassault Aviation, Modélisation Mathématique en Mécanique (M3), Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], proceedings
Abstract

hal.archives-ouvertes.fr/CSMA2011/fr/; Ce dixième colloque a vocation d'aborder tous les thèmes en rapport avec le calcul des structures : Modélisation et comportement : Structures minces, élasto-visco-plasticité, rupture, fatigue, endommagement, matériaux composites, mise en forme, procédés de fabrication et d'assemblage. Méthodes et techniques de résolution : Parallélisme, sous-structuration, contact, frottement, approches multiéchelles, approches stochastiques, prise en compte des incertitudes, méthodes alternatives aux éléments finis. Contrôle et optimisation : Estimation d'erreur et applications, maillage adaptatif, problèmes inverses, identification, recalage, optimisation de forme et de processus, structures adaptatives, contrôle actif, structures intelligentes. Dynamique, interactions et couplages : Dynamique rapide et vibrations non linéaires, crash, vibroacoustique, interactions multiphysiques, sol-structure, fluide-structure. Applications : Industries mécaniques, biens d'équipement, aéronautique et spatial, véhicules et transport, construction navale, génie civil, énergie, nanotechnologies, biomécanique.

Published
2011

30. Parabolic reciprocity gap for heat source identification

Author

Auffray, Nicolas, Bonnet, Marc, Pagano, Stéphane, Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Modélisation Mathématique en Mécanique (M3), Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

The deformation of solid materials is nearly always accompanied with temperature variations. These variations, governed by the heat diffusion equation stemming from the first and second laws of thermodynamics, are induced by intrinsic dissipation of energy and thermomechanical coupling. Infrared thermography techniques provide an experimental means for measuring thermal fields on specimen boundaries. But even if thermal fields are related to the material behavior they are not intrinsic to it as they also depend on external factors such as boundary conditions. Inverting boundary thermal fields is thus needed to obtain valid insight into the specimen thermomechanical behavior. Such an operation belongs to the class of source inverse problem. Inverse source problems are known to be ill-posed in the sense of Hadamard: their solution does not depend continuously on the data, and is not unique for a general source distribution when using only boundary measurements. Modeling hypotheses on the sought sources are thus needed to properly retrieve information.

Published
2010

31. Consistent thermodynamic modelling wire-reinforced by wire

Author

Laniel , R., Alart , Pierre, Pagano , Stéphane, Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [ PHYS.MECA.SOLID ] Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph]
Published
2007

32. A new modelling of elastic adhesive bonded joints by oscillation-concentration measures

Author

Licht , Christian, Michaille , Gérard, Pagano , Stéphane, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ MATH.MATH-AP ] Mathematics [math]/Analysis of PDEs [math.AP], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [ PHYS.MECA.SOLID ] Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

33. A review of identification methods based on full-field measurements

Author

Pagano, Stéphane, Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

i

Published
2006

34. Extracting constitutive parameters from full-field measurements : a review of identification methods

Author

Pagano, Stéphane, Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

i

Published
2006

35. Coherent thermodynamical modelling of geomaterial reinforced by wires

Author

Laniel, Romain, Alart, Pierre, Pagano, Stéphane, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], thermodynamics, unilaterality, numeric, [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], wire, Classical Physics (physics.class-ph), FOS: Physical sciences, Physics - Classical Physics, geomaterial, continuous
Abstract

The TexSol is a composite geomaterial : a sand matrix and a wire network reinforcement. For small strains a thermodynamical continuous model of the TexSol including the unilaterality of the wire network is postulated. This model is described by two potentials which depend on some internal variables and a state variable either strain or stress tensor (the choice of this last one gives two different ways of identification). The TexSol continuous model is implemented in a finite element code to recover the mechanical behaviour given by discrete elements numerical experiments.

Published
2006

36. Extracting constitutive parameters from full-field measurements : a review of identiication methods

Author

Bonnet, Marc, Grediac, Michel, Hild, François, Pagano, Stéphane, Avril, Stéphane, Pierron, Fabrice, Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Published
2005

37. Homogénéisation et maçonneries

Author

Licht, Christian, Pagano, Stéphane, Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

i

Published
2003

38. Contrained bounds on texture coefficients

Author

Pagano, Stéphane, Paroni, R., Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

i

Published
2003

39. Identification of mechanical properties by displacement field measurements

Author

Pagano, Stéphane, Geymonat, Giuseppe, Hild, F., Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

i

Published
2003

40. Thermomechanical models for phase transitions and mechanical instability

Author

Pagano , Stéphane, Alart , Pierre, Parramon , J., Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ MATH.MATH-AP ] Mathematics [math]/Analysis of PDEs [math.AP], behavior, [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [ SPI.MECA.SOLID ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph], [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], shape-memory alloys, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [ PHYS.MECA.SOLID ] Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph]
Abstract

The behaviour of materials involving solid/solid phase transitions may be modelled by more or less smooth laws which lead to convex or non convex bulk potentials. We consider a class of models which contains the Fremond model as the simplest one, and models obtained by introduction of interaction energies between the phases. A series of assumptions and developments as well as the introduction of the marginal function defined as the minimum of the specific energy give quasiconvexification and convexification of the Fremond modelling. By accepting local minima of the total energy as possible equilibrium state, we can find numerically hysteretic behaviours and fronts of phase transition. Different stochastic perturbations are introduced to improve the formulation, and the influence of the latent heat on the hysteretic loop is analysed.

Published
1999

43. Two-Dimensional Deterministic Model of a Thin Body with Randomly Distributed High-Conductivity Fibers.

Author

Michaille, Gérard, Nait-ali, Azdine, and Pagano, Stéphane

Subjects
DETERMINISTIC algorithms, FIBERS, THERMAL conductivity, ERGODIC theory, STOCHASTIC analysis, STOCHASTIC convergence, TWO-dimensional models
Abstract

By using ergodic theory of subadditive processes and variational convergence, we study the macroscopic behavior of a thin 3D composite made up of high-conductivity fibers that are randomly distributed according to a stochastic point process in a bounded open set of ${\mathbb R}^3$. The thickness of the body, the conductivity and the size of the cross sections of the fibers depend on a small parameter ɛ. The variational limit functional energy obtained when ɛ tends to 0 is deterministic and depends on two variables: one is the solution of a variational problem posed in a 2D bounded open set and describes the behavior of the medium; the other captures the limit behavior of suitably rescaled solutions in the fibers when the thickness and the size section become increasingly thin and the conductivity of the fibers becomes increasingly large. [ABSTRACT FROM AUTHOR]

Published
2014

44. Identification of transient heat sources using the reciprocity gap.

Author

Auffray, Nicolas, Bonnet, Marc, and Pagano, Stéphane

Subjects
RECIPROCITY theorems, INFORMATION theory, HEAT equation, INVERSE problems, THERMOGRAPHY, PROBLEM solving
Abstract

The deformation of solid materials is nearly always accompanied with temperature variations, induced by intrinsic dissipation and thermomechanical coupling. Heat sources give precious information on the thermomechanical behaviour of materials. They can be indirectly observed from thermal measurements on the specimen boundary, obtained, e.g., via infrared thermography. To solve the inverse problem of identifying heat sources from such observations, a non-iterative algebraical method based on the reciprocity gap method is proposed. This approach, used elsewhere mainly for time-independent identification, is applied here to transient measurements. Under appropriate modelling assumptions the number of heat sources, their spatial locations and energies are retrieved, as demonstrated on numerical experiments where the robustness of the method to measurement noise is also studied. [ABSTRACT FROM AUTHOR]

Published
2013
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45. Editorial.

Author

Bonnet, Marc, Cornuault, Christian, and Pagano, Stéphane

Subjects
MEETINGS, MECHANICAL behavior of materials, MECHANICS (Physics), CONFERENCES & conventions
Published
2012
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46. Macroscopic behavior of a randomly fibered medium

Author

Michaille, Gérard, Nait-ali, Azdine, and Pagano, Stéphane

Subjects
*ERGODIC theory, *STOCHASTIC convergence, *RANDOM walks, *POINT processes, *STIFFNESS (Engineering), *STOCHASTIC processes
Abstract

Abstract: By combining variational convergence with ergodic theory of subadditive processes, we study the macroscopic behavior of a randomly fibered medium. The cross sections of the fibers are randomly distributed according to a stationary point process, their size is of order ε while the stiffness of the material in the matrix is of order . The variational limit functional energy obtained when ε tends to 0 is deterministic and non-local. [Copyright &y& Elsevier]

Published
2011
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47. A model of elastic adhesive bonded joints through oscillation–concentration measures

Author

Licht, Christian, Michaille, Gérard, and Pagano, Stéphane

Subjects
*OSCILLATIONS, *STOCHASTIC convergence, *CONJUGATE gradient methods, *FUNCTIONAL analysis
Abstract

Abstract: We present a new model of adhesive bonded joints, encoding both gradient oscillations and gradient concentrations. By introducing a narrower notion of Young measure–varifold pair and a variational convergence of the energy functionals, we characterize the measure solutions of the model and give a microscopic description of the densities related to the classical formulation. [Copyright &y& Elsevier]

Published
2007
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48. Dynamic Sensitivity of a Multi-block Stack Subjected to Horizontal Harmonic Excitation

Author

Camenen, Jean-Francois, Čeh, Nina, Jelenić, Goran, Bićanić, Nenad, Koziara, Tomasz, Service irevues, irevues, Association Française de Mécanique, Boucard, Pierre-Alain, Gravouil, Anthon, and Pagano, Stéphane

Subjects
non smooth contact dynamic, energy distribution, block dynamics, non-smooth contact dynamics, self organisation, simulation, [PHYS.MECA]Physics [physics]/Mechanics [physics], [PHYS.MECA] Physics [physics]/Mechanics [physics]
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; Dynamic sensitivity of a one-dimensional stack of four rigid blocks with controlled initial gaps, undergoing external harmonic vibrations is investigated. Time variation of the mass inertia and the relative kinetic energy are considered as dynamic block stack attributes. Numerical simulation is based on the Non Smooth Contact Dynamics (NSCD) time integration framework Solfec (http://code.google.com/p/solfec/). Sensitivity space parameters include a range of excitation frequencies and velocity amplitudes.

Published
2015

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