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This appendix presents an analytical model that estimates damage rates for both crack initiation and propagation mechanisms. The model provides a nonarbitrary definition of fatigue crack initiation length, which serves as an analytical link between initiation and propagation analyses and appears to have considerable merit in estimating the total fatigue life of notched and cracked structures.

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Nonarbitrary Crack Size Concept for Fatigue Crack Initiation, Mechanics and Mechanisms of Fracture: An Introduction, By Alan F. Liu, ASM International, 2005, p 379–381,

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