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Title: The Evaluation of Front Shapes of Through-the-Thickness Fatigue Cracks
Authors: Zakavi, Behnam
Kotousov, Andrei
Branco, Ricardo 
Keywords: crack front shape; structural plates; through-the-thickness crack; steady-state loading conditions; small-scale yielding
Issue Date: 2021
Project: UIDB/00285/202 
Serial title, monograph or event: Metals
Volume: 11
Issue: 3
Abstract: Fatigue failure of structural components due to cyclic loading is a major concern for engineers. Although metal fatigue is a relatively old subject, current methods for the evaluation of fatigue crack growth and fatigue lifetime have several limitations. In general, these methods largely disregard the actual shape of the crack front by introducing various simplifications, namely shape constraints. Therefore, more research is required to develop new approaches to correctly understand the underlying mechanisms associated with the fatigue crack growth. This paper presents new tools to evaluate the crack front shape of through-the-thickness cracks propagating in plates under quasi-steady-state conditions. A numerical approach incorporating simplified phenomenological models of plasticity-induced crack closure was developed and validated against experimental results. The predicted crack front shapes and crack closure values were, in general, in agreement with those found in the experimental observations.
ISSN: 2075-4701
DOI: 10.3390/met11030403
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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