Developing Multi-scale Model to Study Atypical Crystal Plastic Behavior

Abstract

To study atypical plasticity behaviors for single-crystals at submicron-to-nanometer scales, a three-dimensional discrete dislocation dynamics (3D-DDD) model coupled with finite element method (FEM) is developed. With this new formulation, 3D discrete dislocation plasticity is completely handled under a continuum mechanics framework. It has a competitive advantage in solving large and nonlinear deformation problems by communicating deformation variables between DDD and FEM. As an application, an uniaxial compression test for Cu micro-pillars is simulated to investigate the process of dislocation propagating, starvation hardening and the effect of boundary conditions.