| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
Simulation of Plastic Strain Localisation in Polycrystals by 3D Discrete Dislocation Dynamics |
| Author(s) |
Baptiste Joste, Riccardo Gatti, Henry Proudhon, Benoit Devincre |
| On-Site Speaker (Planned) |
Riccardo Gatti |
| Abstract Scope |
Understanding deformation leading to polycrystalline material failure is a major challeng in materials science. The origin of plastic strain localization and deformation propagation mechanisms remain unclear. To tackle those issues, we propose a multi-scale simulation approach using 3D Discrete Dislocation Dynamics (DDD) and the Finite Element Method (FEM) to model mesoscopic dislocation behavior. First, our results emphasize the impact of policrystalline microstructure on plastic deformation localization, revealing intragranular stress concentrations due to elastic incompatibilities. During plastic deformation, we obsereved that specific mechanisms such as cross-slip or collinear annihilation facilitate the initiation of plastic deformation within these stress concentration regions a. Furthermore, ,we implemented a local rule to model dislocation transmission, to decrease strain hardening and promotes slip localization. Our findings highlights that plastic deformation transmission is crucial to observe plastic strain localization in polycrystals. |
| Proceedings Inclusion? |
Undecided |