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43 results on '"Schmitt, Jean-Hubert"'

1. Multi-parameter optimization of attenuation data for characterizing grain size distributions and application to bimodal microstructures

Author

Renaud, Adrien, Tie, Bing, Mouronval, Anne-Sophie, and Schmitt, Jean-Hubert

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

In this paper, the effect on the ultrasonic attenuation of the grain size heterogeneity in polycrystals is analyzed. First, new analytical developments allowing the extension of the unified theory of Stanke and Kino to general grain size distributions are presented. It is then shown that one can additively decompose the attenuation coefficient provided that groups of grains are defined. Second, the study is specialized to a bimodal distribution of the grain size for which microstructures are numerically modeled by means of the software Neper. The additive partition of the attenuation coefficient into contributions coming from large and small grains motivates the derivation of an optimization procedure for characterizing the grain size distribution. The aforementioned approach, which is based on a least squares minimization, is at last presented and illustrated on both analytical and numerical attenuation data. It is thus shown that the method provides satisfying approximations of volume fractions of large grains and modal equivalent diameters from the frequency-dependent attenuation coefficient.

Published
2021

4. Review of the Synergies Between Computational Modeling and Experimental Characterization of Materials Across Length Scales

Author

Dingreville, Rémi, Karnesky, Richard A., Puel, Guillaume, and Schmitt, Jean-Hubert

Subjects
Condensed Matter - Materials Science
Abstract

With the increasing interplay between experimental and computational approaches at multiple length scales, new research directions are emerging in materials science and computational mechanics. Such cooperative interactions find many applications in the development, characterization and design of complex material systems. This manuscript provides a broad and comprehensive overview of recent trends where predictive modeling capabilities are developed in conjunction with experiments and advanced characterization to gain a greater insight into structure-properties relationships and study various physical phenomena and mechanisms. The focus of this review is on the intersections of multiscale materials experiments and modeling relevant to the materials mechanics community. After a general discussion on the perspective from various communities, the article focuses on the latest experimental and theoretical opportunities. Emphasis is given to the role of experiments in multiscale models, including insights into how computations can be used as discovery tools for materials engineering, rather than to "simply" support experimental work. This is illustrated by examples from several application areas on structural materials. This manuscript ends with a discussion on some problems and open scientific questions that are being explored in order to advance this relatively new field of research., Comment: 25 pages, 11 figures, review article accepted for publication in J. Mater. Sci

Published
2015
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17. Numerical investigation of ultrasonic wave scattering in polycrystalline materials

Author

Renaud, Adrien, Mouronval, Anne-Sophie, Schmitt, Jean-Hubert, Aubry, D., Solas, Denis, Tie, B., Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), CentraleSupélec, and Centre National de la Recherche Scientifique (CNRS)

Subjects
[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], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

18. Application of laser ultrasonics to monitor microstructure evolution in Inconel 718 superalloy

Author

Garcin Thomas, Schmitt Jean-Hubert, and Militzer Matthias

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Laser ultrasonics for metallurgy is an innovative sensor dedicated to the measurement of microstructure evolution during thermomechanical processing. In this technique, broadband ultrasound pulses are generated and detected with lasers. The properties of the ultrasounds are then related to the characteristics of the microstructure. Ultrasound attenuation is primary originated by the scattering at grain boundaries and its frequency dependence can be related to the grain size. The present work aims to introduce this technology as an exciting tool for metallurgists. As an illustration of its capability, the evolution of the grain size during isothermal annealing from a fine grained structure is in-situ monitored in an Inconel 718 superalloy. Laser ultrasonic measurements are compared with ex-situ metallography observations. Indication of heterogeneous grain growth is observed, correlated to the dissolution of δ-phase particles present in the initial structure. This preliminary study illustrates the potential of this new technique to monitor microstructure evolution in more complex scenarios including recrystallization during simulation of hot forging processes.

Published
2014
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19. Numerical simulation of ultrasonic attenuation by a bimodal grain size polycristal

Author

Bai, X., Tie, B., Aubry, Denis, Schmitt, Jean-Hubert, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), CentraleSupélec, and Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

20. Development of 3rd generation Medium Mn duplex steels for automotive applications

Author

Perlade, Astrid, primary, Antoni, Annie, additional, Besson, Rémy, additional, Caillard, Daniel, additional, Callahan, Michael, additional, Emo, Jonathan, additional, Gourgues, Anne-Françoise, additional, Maugis, Philippe, additional, Mestrallet, Aurore, additional, Thuinet, Ludovic, additional, Tonizzo, Quentin, additional, and Schmitt, Jean-Hubert, additional

Published
2018
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21. Quantification of TRIP Kinetics in Medium Mn Steels by in-situ Magnetic Measurements

Author

Callahan, Michael, Hubert, Olivier, Schmitt, Jean-Hubert, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), and ANR-13-RMNP-0002,MeMnAl Steels,Développement d'aciers de 3ème génération à structures duplex destinés à l'automobile(2013)

Subjects
AHSS, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], technology, industry, and agriculture, TRIP, Lüders bands, TWIP, third generation steels, medium Mn, magnetic susceptibility, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Increasing interest of the automotive industry in light, high strength – high formability steels has led to the development of a third generation of advanced high strength steels (AHSS). So-called Medium-Mn alloys belong to this generation of steel. Medium-Mn alloys are ultra-fine-grained dual phase steels containing a mixture of ferrite and retained austenite. The stability of the retained austenite controls the degree to which transformation induced plasticity (TRIP) or twinning induced plasticity (TWIP) may be observed. In the current study Medium-Mn alloys of varying degrees of austenite stability are studied, all of which exhibit the TRIP deformation mechanism. The kinetics of the phase transformation are evaluated by using in-situ measurements of the magnetic properties of a sample to determine the volume fraction of retained austenite as a function of the plastic strain during tensile testing. Results are compared to phase volume fraction measurements made by X-ray diffraction (XRD). The magnetic measurement is shown to be as robust as XRD while providing a much richer data set with a shorter overall experiment duration.

Published
2016

22. Numerical Modeling of Grain Size Effects on Ultrasonic Propagation in Polycrystalline Materials

Author

Bai, X., Tie, B., Schmitt, Jean-Hubert, Aubry, Denis, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), CentraleSupélec, and Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

25. FE Modeling of Ultrasound attenuation and Backscattering in polycrystalline materials

Author

Tie, B., Bai, X., Aubry, Denis, Schmitt, Jean-Hubert, Solas, Denis, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), CentraleSupélec, Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
[SPI]Engineering Sciences [physics], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

26. Characterization and Simulation of Deformation-Induced Martensitic Transformations in Medium-Manganese Steels

Author

Callahan, Michael, Schmitt, Jean-Hubert, Association Française de Mécanique, and Service irevues, irevues

Subjects
XRD, magnetic measurements, TRIP, iso-work, [PHYS.MECA]Physics [physics]/Mechanics [physics], [PHYS.MECA] Physics [physics]/Mechanics [physics], martensitic transformation
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; The development of medium-manganese austeno-ferritic steels offers a compromise between the mechanical properties of TRIP (transformation-induced plasticity) and TWIP (twinning-induced plasticity) steels by using the austenite stability to control the active deformation mechanism. Annealing temperatures of 740°C and 780°C provide austenite phases that are respectively stable (no transformation) and metastable (easily transformed) under deformation. This behavioral contrast allows for the isolation of the contribution to work hardening from the TRIP effect, which the current works seeks to quantify via the kinetics of the martensitic transformation. Measurements of the austenite volume fraction as a function of total strain were made via x-ray diffraction and magnetic measurements and were used to develop an iso-work mixture rule to predict the macroscopic behavior of the sample using microstructural information.

Published
2015

27. Numerical modeling of grain size effect on the ultrasonic propagation in polycrystalline materials

Author

Bai, Xue, Tie, Bing, Schmitt, Jean-Hubert, AUBRY, Denis, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and CSMA

Subjects
grain size, ultrasonic wave propagation, polycrystals, [PHYS.MECA]Physics [physics]/Mechanics [physics], backscattering, attenuation
Abstract

International audience; Grain size effect on the ultrasonic propagation in single phase, untextured and equiaxed polycrystalline materials by numerical modeling is studied. Attenuation levels and backscattered noise signals are calculated in both time and frequency domains according to the response of several receivers. Coherent comparisons are obtained between our numerical results and some well-known classical theories.

Published
2015

30. MODELING DYNAMIC RECRYSTALLIZATION OF METALS USING CRYSTAL PLASTICITY

Author

Schmitt, Jean-Hubert, De Jaeger, Julien, Solas, Denis, Rey, C., Fandeur, Olivier, Laboratoire de Mécanique Systèmes et Simulation (LM2S), Service d'Etudes Mécaniques et Thermiques (SEMT), Département de Modélisation des Systèmes et Structures (DM2S), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Modélisation des Systèmes et Structures (DM2S), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[SPI]Engineering Sciences [physics]
Abstract

International audience; Inconel alloys for aerospace motor applications are hot forged and their final properties are mainly control by the homogeneity of the grain size. In hot forging conditions, dynamic recrystallization occurs and the prediction of the final microstructure requires an accurate modeling of this deformation mechanism. A polycrystal modeling, coupling CPFEM and recrystallization models, have been developed using a 3D EBDS description of a representative volume. With only a few material parameters, it is then possible to predict mechanical behavior during hot forging and grain size evolution. INTRODUCTION: Inconel 718 is usually hot forged between 925 and 1150°C with the objective to control the homogeneity of the grain size and the final mechanical properties. At temperatures above 1,000°C, the alloy is a fcc single-phase as the  phase is totally dissolved. Thomas et al. [2004] showed that dynamic recrystallization is the main mechanism controlling the microstructure evolution. A polycrystalline model is developed to account for dynamic recrystallization. A 3D EBSD mapping of a representative volume is reconstructed from serial polished sections. Its behavior is simulated by coupling a crystal plasticity finite element model (CristalECP) with a 3D recrystallization cellular automaton (RecUPS). The two models work with sequences of deformation and recrystallization steps. CristaECP is based on the theory of continuous dislocations and on physical constitutive laws (Erieau [2004]). The polycrystalline model is implemented in Abaqus TM

Published
2014

31. Development of 3rd generation Medium Mn duplex steels for automotive applications.

Author

Perlade, Astrid, Antoni, Annie, Besson, Rémy, Caillard, Daniel, Callahan, Michael, Emo, Jonathan, Gourgues, Anne-Françoise, Maugis, Philippe, Mestrallet, Aurore, Thuinet, Ludovic, Tonizzo, Quentin, and Schmitt, Jean-Hubert

Subjects
STEEL, FRACTURE mechanics, DYNAMICS, MICROSTRUCTURE, TENSILE strength
Abstract

The mechanical behaviour and fracture were studied in a Fe-5Mn-2.5Al-0.2C (in wt-%) Medium Mn steel. Metallographic and magnetic measurements confirm the significant influence of the transformation kinetics of the strain-induced martensite on the mechanical properties and strain heterogeneities (Lüders and Portevin-Le Chatelier-like phenomena). An accurate study of isothermal evolutions of the microstructure, associated with atomistic calculations, complements current thermodynamic databases to quantify the nature and volume fraction of phases at different temperatures. A kinetic approach then predicts the influence of annealing conditions on the composition of retained austenite, key parameter for the martensitic transformation kinetics. This supports quantitative modelling of the influence of the intercritical annealing temperature on the ultimate tensile strength for industrial developments of these new grades. [ABSTRACT FROM AUTHOR]

Published
2019
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32. Measurement of Texture Gradient in Heavily Cold‐Drawn Pearlitic Wires.

Author

Jamoneau, Aurélie, Schmitt, Jean‐hubert, and Solas, Denis

Subjects
ANISOTROPY, FERRITE phase shifters, ROBUST control, X-ray diffraction, ISOTROPIC properties, PEARLITIC steel, TORSION
Abstract

It is well established that cold‐drawing of pearlitic wire develops a strong anisotropy due to a preferential <110> orientation of the ferrite phase parallel to the wire axis. The subsequent wire behavior during torsion, which mainly occurs during assembling of drawn wires, is correlated with the texture and its gradient along the wire radius. Although different attempts were made in the past to measure the texture after drawing, it is still challenging since the final wire diameter is on the order of 0.3 mm. The paper presents a simple and robust method to measure the texture gradient by X‐ray diffraction. First, to overcome the problems of a composite sample made of parallel wires, an isotropic reference sample is prepared by cycles of austenite transformation and quenching. The texture gradient is measured at different thicknesses by dissolving the external surface of the wires. This allows the investigation of the first 40 μm of depth. Finally, the results are compared with EBSD measurements on a longitudinal cross‐section to quantify the influence of the drawing conditions: A flat schedule with constant die angles favors a <110> fiber texture with a weak gradient, while increasing the drawing angle for three dies increases the gradient. [ABSTRACT FROM AUTHOR]

Published
2018
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35. Experimental characterization and mechanical behavior modelling of MoTiC composite for high temperature

Author

Denis, Cédat, Rey, Colette, Clavel, Michel, Fandeur, Olivier, Le Flem, Marion, Schmitt, Jean-Hubert, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

36. Microstructural characterization of a composite TiC reinforced by 20%Mo

Author

Cédat, Denis, Rey, Colette, Clavel, Michel, Schmitt, Jean-Hubert, Le Flem, Marion, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Composite, [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], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

37. Characteriasation for Numerical Study of Mechanical Behaviour of Cermet Mo-Tic

Author

Cédat, Denis, Rey, Colette, Clavel, Michel, Schmitt, Jean-Hubert, Le Flem, Marion, Allemand, A., Langlet, Nathalie, Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Régulation de l'expression génétique chez les microorganismes (REGCM), and Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.MEMA] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

38. Review of the synergies between computational modeling and experimental characterization of materials across length scales.

Author

Dingreville, Rémi, Karnesky, Richard, Puel, Guillaume, and Schmitt, Jean-Hubert

Subjects
MATERIALS science, COMPUTATIONAL mechanics, PREDICTION models, MECHANICAL behavior of materials, TRANSMISSION electron microscopy, FINITE element method
Abstract

With the increasing interplay between experimental and computational approaches at multiple length scales, new research directions are emerging in materials science and computational mechanics. Such cooperative interactions find many applications in the development, characterization and design of complex material systems. This manuscript provides a broad and comprehensive overview of recent trends in which predictive modeling capabilities are developed in conjunction with experiments and advanced characterization to gain a greater insight into structure-property relationships and study various physical phenomena and mechanisms. The focus of this review is on the intersections of multiscale materials experiments and modeling relevant to the materials mechanics community. After a general discussion on the perspective from various communities, the article focuses on the latest experimental and theoretical opportunities. Emphasis is given to the role of experiments in multiscale models, including insights into how computations can be used as discovery tools for materials engineering, rather than to 'simply' support experimental work. This is illustrated by examples from several application areas on structural materials. This manuscript ends with a discussion on some problems and open scientific questions that are being explored in order to advance this relatively new field of research. [ABSTRACT FROM AUTHOR]

Published
2016
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