Abstract
The present work investigates the generation process of crack face closure under laser shock and its effect on the crack opening behavior to reveal the underlying reason for the high-level crack closure induced by laser peening (LP) on the initial fatigue crack. It is found that crack face closure generates a firm compression to the crack face, causing the significant elongation in the crack wake during the crack opening process to prevent crack faces from separating even under the high-level external load. The contribution of crack face closure to crack retardation is comparable to LP-induced residual stress.
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