Development of a dislocation-based constitutive law for fcc crystals on a wide range of deformation amplitude.

International audienceAn original description for crystal plasticity is presented in this work. It is built on a reduced set of constitutive laws whose writing is fully based on physical mechanisms responsible for plasticity in fcc crystal. Dislocation microstructures and their effect on the macroscopic behavior have been studied using 3D Dislocation Dynamics simulations. The result is a model that introduces both isotropic hardening and kinematic hardening without using any phenomenological consideration. Remarkable results are obtained in a wide range of imposed plastic strain amplitude (from small amplitude cyclic loading (10-5) to large strain monotonic loading)