Prediction of grain boundary micro-crack initiation during cyclic deformation

J. Hazan (1) , M. Sauzay (1)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)

Prediction of grain boundary (GB) micro-crack initiation is a major issue to understand lifetime of ductile metals and alloys subjected to cyclic deformation. Finite element simulations of the cyclic deformation of small aggregates of various fcc metals and alloys are performed. Calculations account for (i) cubic elasticity and crystal plasticity, (ii) slip localization in PSBs and (iii) production, annihilation of vacancies within PSBs and their diffusion toward the surrounding matrix, inducing a free dilatation increasing cycle by cycle. Grain boundary micro-crack initiation is predicted using both finite fracture mechanics and cohesive zone modeling.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

J. Hazan, M. Sauzay. Prediction of grain boundary micro-crack initiation during cyclic deformation. International Conference on Interface and Interphase Boundaries in Materials (IIB-2019), Jul 2019, Paris, France. ⟨cea-02394073⟩