Based on pulsed laser irradiation processing, an approach to the recovery of fatigue damage was investigated by an excimer laser for copper film with thickness of 25 mm. First, optimal parameters of laser irradiation were identified by the obtained fatigue life results under different laser treatment conditions. Then, the specimens with different amounts of fatigue damage were treated by the obtained optimal laser parameters. The results showed that the copper film can show a good degree of hardening and a smooth surface feature after the specimen surface was slightly melted by the laser irradiation, which makes the residual fatigue life be extended. When fatigue damage is less than 70%, the damage can be recovered by pulsed laser irradiation treatment. The obtained residual fatigue life of specimens is about 6 times that of no laser treatment.
The healing variable and enhancement variable were first defined by the fatigue ductility, and then based on the relationship of the damage variable, the healing variable and the enhancement variable, a nonlinear fatigue damage‐healing model was proposed for predicting the fatigue life of the healed copper film by laser shock peening (LSP). The nonlinear fatigue damage cumulative process was considered in the model for the original specimen without LSP under constant and variable amplitude loadings. The results showed that the proposed nonlinear fatigue damage‐healing model can predict the residual fatigue life for the damaged copper film specimen well.
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