Considered was the tandem emission of dislocations and dislocation dipoles from a crack under in-plane shear in one slip system as well as multiple slip systems. Effective stress intensity factors were determined by considering zones of local distortion similar to that in macro-plasticity. The dislocation free zone was also obtained which was analogous to the core region in fracture mechanics. Studied were effects of dislocation emission or development of plastic zone in front of the crack tip on the potential crack propagation based on the strain energy density factor criterion.

Simulation of Edge Dislocation Emission from a Crack Under In-Plane Shear. C.F.Qian, H.F.Li, Z.J.Jiang, D.S.Fan: Theoretical and Applied Fracture Mechanics, 2005, 43[3], 369-75