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This document summarizes fatigue crack initiation mechanisms in metals. It discusses how cracks typically initiate at persistent slip bands near the surface or at grain boundaries due to localized cyclic plastic deformation. The formation of persistent slip bands is related to the cyclic stress-strain response. Several models are presented to describe surface and subsurface crack initiation. Predictive models of microcrack initiation and early propagation are still being developed.
- Author
- sunil ugadi
- Language
- EN