Abstract
PSB substructure plays critical roles in fatigue phenomena. A crystal plasticity finite element method, where the modeling and simulation based on Field Theory of Multiscale Plasticity (FTMP), was used to investigate the behavior of PSB structure under cyclic straining, both in terms of its formation and the transition into a crack. This study investigates afresh the effect of artificially-introduced initial surface imperfections on the PSB formation, together with its further evolutions toward fatigue crack, in the restart analysis. The PSB-ladder morphology and the attendant groove extension are demonstrated to be resulted similar to those in the previous study, however, the extension rate tends to saturate eventually, leading us to conclude that there should exist minimal curvature radius for the PSB-crack transition to be appropriately simulated.
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