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Recherche - Valorisation

Improving Crystal Plasticity Models with Dislocation Dynamics Simulations

le 31 mai 2018
à 13h30

Benoit Devincre, Directeur de Recherche au Laboratoire d’Étude des Structures (CNRS/ONERA), interviendra lors d'un séminaire.

Plastic deformation of crystalline materials is mainly the outcome of the dynamics and the collective interactions of dislocations, in response to external or internal load, their mutual interactions and interactions with boundaries such as free surfaces, interfaces or grain boundaries. The dislocation microstructures emerging from such dynamics are intrinsically heterogeneous and the way they affect the mechanical properties is a puzzling problem. This is why, the development of constitutive equations for the modeling of this multiscale problem is very challenging. After two decades of developments, three-dimensional Discrete Dislocation Dynamics (3D-DDD) simulation emerges as an essential tool to investigate those questions.

In this presentation, strain hardening in FCC metals is discussed from the viewpoint of scale transitions. Results of 3D-DDD simulations are presented as a guide to improve crystal plasticity models and to calculate the latter constitutive parameters. Focus is made on the generic properties of forest interactions and dislocation patterning that control isotropic and kinematic hardening, respectively. Connection between such elementary properties and the Bauschinger effect or the Hall-Petch effect on the macroscopic scale is made.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Bâtiment Léonard de Vinci
Amphi E-media

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