GENERALIZED CONSTITUTIVE LAWS FOR FCC SINGLE-CRYSTALS

Simulations of the elastoviscoplastic behaviour of f.c.c. single cryst als are performed. The work includes the setting of specific constitut ive laws. The viscoplastic behaviour of single crystals is described w ith a dislocation-based model. As the behaviour of single crystals is highly non-linear, a dedicated finite element code is developed in ord er to compute uniaxial tests with the tensile axis put inside the ster eographic triangle. This simulation reveals wide possibilities of the combination of suitable physical models and numerical tools. It is sho wn that the adopted constitutive laws are able to give back complex ex perimental evidence. (C) 1997 Elsevier Science S.A.