SYMPOSIA PAPER Published: 01 January 1988

On Crack Closure in Fatigue Crack Growth


A brief review of the various forms of closure is given, and the relative importance of plasticity-induced closure and roughness-induced closure is considered. On the basis of the lack of a thickness effect and an insensitivity to R in the absence of closure it is concluded that plasticity-induced closure plays a relatively minor role in affecting the rate of fatigue crack propagation with the exception of overload effects. A new form of closure, transitional closure is described and is shown to affect importantly the rate of fatigue crack growth upon a change in R ratio. The closure process for a short crack approaching a grain boundary is also discussed.

Author Information

McEvily, AJ
University of Connecticut, Storrs, CT
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Developed by Committee: E08
Pages: 35–43
DOI: 10.1520/STP27199S
ISBN-EB: 978-0-8031-5052-2
ISBN-13: 978-0-8031-0996-4