Self-consistent large strain modelling of polycrystals: application to ductility loss prediction

Abstract

The elastic-plastic behavior of polycrystals is studied. A single-crystal constitutive law is defi ned thanks to crystalline plasticity in the large strain framework. The self-consistent scheme is adopted to obtain macroscopic behavior from microscopic one. Rice's criterion is introduced to predict ductility loss. Obtained results show the proposed model ability to simulate single-crystal and single-phase polycrystals behavior. It can also give good qualitative results on forming limit diagrams prediction.