Abstract
Fatigue damage gets accentuated by localized stresses and strains contributing to crack initiation and growth, resulting in component failures. Cracks being high-energy defects require in situ or preexisting stress concentrations for their initiation and growth. Generally, large grains close to the surface deform more readily, resulting in localized slip bands, intrusions, protrusions, and, thus, deformation-induced stress concentrations, which can initiate cracks. In some cases, localized stresses and strains can cause plasticity-induced phase transformations that can reduce these stresses. If this happens near the crack tip, the reduced crack tip stresses contribute to crack tip toughening, thereby increasing resistance to subsequent crack growth. We have well established in the past that fatigue damage is characterized by two load parameters, maximum stress and stress amplitude. It is the applied maximum stress that causes the local plasticity-induced transformations. Hence, the transformation-induced toughening process at the crack tip must be correctly analyzed considering maximum stress intensity factor, Kmax contributing to stress or strain-induced transformation ahead of the crack tip. This paper reanalyzes the available fatigue data of some austenitic stainless steels that undergo localized plasticity-induced transformations, considering the two load-parametric nature of fatigue damage.
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KS and NI acknowledge the support from the Navy Contract# N68335-16-C-0135 with Dr. Anisur Rahman as the program officer.
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Sadananda, K., Iyyer, N. & Babu, M.N. Effects of Localized Plasticity-Induced Transformation on Fatigue Crack Growth. Trans Indian Natl. Acad. Eng. 7, 385–395 (2022). https://doi.org/10.1007/s41403-021-00255-6
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DOI: https://doi.org/10.1007/s41403-021-00255-6