De l'impression 3d en céramique
Mesurer la déformation du sel, pour l'aménagement de réservoirs en cavités salines
Electromagnetic forming process for metallic pieces
Amélioration de la performance des éoliennes
Vers un stockage géologique du C02 avec impuretés
The objective of the SIMS (SImulation des Matériaux et des Structures) cluster is to have good representations of the behavior and the breaking of materials in computation codes. There are therefore studies with a strong digital component including software development, and research conducted in collaboration with other teams, to compare the models developed with experimental results. Collaborations are done with many french or foreign teams.
This activity is based on the functional group that develops and maintains the computer resources of the Centre des Matériaux, in particular parallel computers.
This theme highlights the interaction between different research axes such as : acquisition of 2D, 3D and 4D images, measurement of thermomechanical fields, image analysis and meshing from experimental images or derived from random models, the intensive computation, the reduction of the models and the processing of the massive data whether they are of experimental origin or generated by simulations. It concerns the development of numerical methods for data processing. For example, the reduction of non-linear models has largely been inspired by methods developed for image processing. In the hyper-reduction, a mechanical model defined on a reduced mesh makes it possible to have an estimate of a complete stress field.
The tensorial representation of data is the appropriate formal framework to facilitate the comparison of these approaches. In the future, new collaboration protocols will be developed in the context of digital mechanics. This will concern the technological means implemented (means of acquisition, data storage, calculation, etc.), the numerical methods developed, but also the working methods including the training of technicians and engineers.
The elasto-visco-plastic constitutive laws of materials constitute today an arsenal applicable to the different scales of the engineer: industrial components of transport and energy where the efficiency of the formulation and the programming is at the first plan until the detailed description of the elements of matter, polycrystals and composites with complex morphologies.
The multiscale approaches allow to build a hierarchy of models starting from the crystalline plasticity for metals to the multi-mechanism models of macroscropic plasticity. Validation of this corpus of laws involves confronting 2D, 3D and 4D field measurements : kinematic, temperature, elastic deformation and crystalline orientation or polymer chains.
The mechanics of generalized continuous media are used to describe the effects of scales on the viscoplasticity of metals and polymers : effects of grain sizes, precipitates, pores, etc. Finally, the method of phase fields coupled to mechanics aims to simulate the evolution of microstructures (phase changes, interface migrations and grain boundaries, oxidation, etc.) under mechanical stress.
Excessive monotonic or cyclic deformation and the aging of materials and structures lead to the development of instabilities ranging from necking to localization in shear bands or of Portevin - Le Chatelier, to finally lead to rupture. The detection of these modes and the simulation of post-bifurcation and crack propagation states require regularization methods based on the mechanics of generalized continuous media (micromorphic approach of plasticity and gradient damage).
The transition from location to crack initiation and propagation remains a major difficulty, even if the recent advances validated by the confrontation with 2D and 3D kinematic field measurements show the relevance of the laws of behavior and damage developed. These modes of instability are also present within the microstructure of materials. The question of transmitting microscopic instabilities to macroscopic localization is largely open today. Understanding these mechanisms will optimize the architecture of the materials.
Thomas Tancogne-Dejean, Christian Roth, Thilo Morgeneyer, Lukas Helfen, Dirk Mohr. Ductile damage of AA2024-T3 under shear loading: Mechanism analysis through in-situ laminography Acta Materialia, Elsevier, 2021, 205, pp.116556. ⟨10.1016/j.actamat.2020.116556⟩
Thilo Morgeneyer, Xiang Kong, Lukas Helfen, Djamel Missoum-Benziane, Jacques Besson, Mathias Hurst, Tilo Baumbach. Ductile damage study for shear and tension load path changes assessed by experiments and FE simulations WCCM-ECCOMAS CONGRESS, Jan 2021, Paris, France
H. Launay, J. Besson, D. Ryckelynck, François Willot. Hyper-reduced arc-length algorithm for stability analysis in elastoplasticity International Journal of Solids and Structures, Elsevier, 2021, 208-209, pp.167-180. ⟨10.1016/j.ijsolstr.2020.10.014⟩
Jean-Michel Scherer, Vikram Phalke, Jacques Besson, Samuel Forest, Jeremy Hure, Benoît Tanguy. Lagrange multiplier based vs micromorphic gradient-enhanced rate-(in)dependent crystal plasticity modelling and simulation Computer Methods in Applied Mechanics and Engineering, Elsevier, 2020, 372, pp.113426. ⟨10.1016/j.cma.2020.113426⟩
Anna Ask, Samuel Forest, Benoit Appolaire, Kais Ammar. Microstructure evolution in deformed polycrystals predicted by a diffuse interface Cosserat approach Advanced Modeling and Simulation in Engineering Sciences, SpringerOpen, 2020, 7 (1), ⟨10.1186/s40323-020-00146-5⟩
Thilo Morgeneyer, Xiang Kong, Lukas Helfen, François Hild, Ante Buljac. Strain and damage interactions under plane strain conditions: 3D in situ measurements for different microstructures 17th International Conference on Aluminum Alloys ICAA17, Oct 2020, Grenoble, France
Thilo Morgeneyer, Lukas Helfen, Mathias Hurst, Andrei Shkarin, Xiang Kong, Ante Buljac, François Hild, Heikki Suhonen, Jussi-Petteri Suuronen, Tilo Baumbach. In situ observation of damage evolution in alloy sheet materials via synchrotron micro- and nanolaminography In situ observation of damage evolution in alloy sheet materials via synchrotron micro- and nanolaminography, Oct 2020, Grenoble, France
Thilo Morgeneyer, Xiang Kong, Lukas Helfen, G.T. Baumbach, Jacques Besson, Djamel Missoum-Benziane, Mathias Hurst. Ductile damage study for load path changes under low stress triaxiality via 3D synchrotron imaging and FE simulations 17th International Conference on Aluminum Alloys ICAA17, Oct 2020, Grenoble, France