Multiscale modelling, including molecular dynamics and discrete dislocation dynamics (DDD) methods, appears as a significant tool for the description of plasticity and mechanical properties of materials. This research concerns the influence of irradiation on the plasticity of pure Fe and focuses on the interaction of a single dislocation with a spherical void at various geometries. Molecular dynamics simulation showed that the void strengthening was proportional to the interaction area. Stress fields around the void influences also the dislocation passage. DDD calculation coupled to finite element method (FEM) was used to simulate the interaction of an edge dislocation with a void. DDD calculations present a good match to the molecular dynamics simulation results at the near-atomic scale. They highlight the impact of image forces on the dislocation due to the free internal surface of the void and the one of its surrounding stress field.

Dislocation–Void Interaction in Fe - a Comparison between Molecular Dynamics and Dislocation Dynamics. S.M.H.Haghighat, M.C.Fivel, J.Fikar, R.Schaeublin: Journal of Nuclear Materials, 2009, 386-388, 102-5