Separating plasticity-induced closure and residual stress contributions to fatigue crack retardation following an overload

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• 作者：Enrico Salvati^a ; ^{enrico.salvati@eng.ox.ac.uk} ; Hongjia Zhang^a ; Kai Soon Fong^b ; Xu Song^b ; Alexander M. Korsunsky^a
• 关键词：Crack tip plasticity ; Fatigue ; Crack propagation and arrest ; Crack mechanics ; Residual stress ; Overload
• 刊名：Journal of the Mechanics and Physics of Solids
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：98
• 期：Complete
• 页码：222-235
• 全文大小：1601 K
• 卷排序：98

文摘

Observation of crack opening reveals that high load ratio (R=0.7) inhibits crack closure during fatigue crack propagation. The effect of residual stress-strain field generated during overload vanishes when the crack tip advances past the overload plastic zone. When operative, crack closure mechanism has a longer lasting retardation effect on the crack growth rate than residual stress.