Abstract
Incorporating tensile overload (OL) or notch to a fatigue-cracked specimen could prolong fatigue life, but the combined effect of both is unclear up to now. To clarify combined effect of OL-induced residual stress (RS) and notch geometry on subsequent fatigue crack growth (FCG), fatigue tests are carried out by a combination of OL conditions, notch geometries and stress-intensity values. After incorporating notch into a post-OL specimen, the results show that fatigue retardation only results from notch effect at early fatigue phase and then from OL-induced RS later. Additionally, the magnitude of FCG-rate changing and crack-propagation length influenced by notch are related to notch geometry and applied stress ratio, respectively.
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