To quantify the material and mechanical effects on the damage accumulation (DA) mode of fatigue crack propagation (FCP), a crystal plasticity finite element method was used in a polycrystalline copper specimen. Thus, the plastic normal strain localization ahead of the notch root, which is correlated with DA-FCP, was analyzed. As a result, an equation of the critical grain size formulated by the Schmid factor, misorientation angle, and plastic zone size is proposed to characterize the critical occurrence condition for the DA-FCP. Moreover, a method for predicting the DA-FCP region size is proposed.
!!!All Science Journal Classification (ASJC) codes