Abstract
The subsequent recrystallization technique was used to study the process of local damage accumulation around a notch under conditions of low-cycle fatigue. A 0.8-in. compact tension specimen of 304 stainless steel with a notch radius of 1 mm was used. The accumulated plastic zone around notch increases with the number of cyclesN. The accumulated plastic strain within the zone also increases withN, producing the strain gradient (damage gradient). A fatigue crack initiates when the accumulated plastic strain at the notch root reaches a critical value equal to the fracture strain of the material; that is, when the accumulated plastic work at the crack initiation site becomes critical. The fatigue crack emanating from a notch root grows through the pre-existing damaged zone. It is shown that this local damage accumulation approach can explain the fast growth of a short crack from a notch.
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Iino, Y. Local fatigue damage accumulation around notch attending crack initiation. Metall Mater Trans A 26, 1419–1430 (1995). https://doi.org/10.1007/BF02647592
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DOI: https://doi.org/10.1007/BF02647592