A micro-scale crystal plasticity model, recently developed by CEA, is used to simulate a nonlinear mechanical response of type 304L austenitic stainless steel subjected to neutron irradiation. The model is implemented in codes ABAQUS and Cast3M to perform finit element simulations of the polycrystalline aggregates loaded in tension. Grain topology is modeled either by Voronoi tessellations or by a realistic microstructure of the stainless steel wire specimen. The macroscopic stress-strain curves are calculated and compared with the measurements for different irradiation doses. A very good agreement is found for the Voronoi model and a slightly stiffer response is predicted for the realistic wire model. Some preliminary calculations of the local stress distributions at grain boundaries are performed and compared, showing similar evolution trends with applied strain and irradiation levels in both considered spatial models. A brief sensitivity analysis is furthermore performed to estimate the effects of various Voronoi geometries, mesh densities and initial grain orientations.
