Discrete crystal plasticity modelling of slip-controlled cyclic deformation and short crack growth under low cycle fatigue

For metals under fatigue, microplastic strain localisation leads to the formation of discrete slip bands, which contributes initiation and propagation short cracks. In this paper, a band model is introduced investigate slip-controlled cyclic deformation crack growth in single crystal alloy. conjunction with plasticity normal factor-based critical resolved shear stress, finite element simulations demonstrated success describing orientation-dependent stress-strain responses. The proposed approach also capable predicting growth, based on deletion technique individual cumulative criterion.