Fatigue life prediction of damaged copper film by laser irradiation repairing |
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| Authors: | C.‐G. Ren D.‐G. Shang Y.‐J. Sun Y.‐B. Guo T. Chen |
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| Affiliation: | 1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China;2. Institute of Laser Engineering, Beijing University of Technology, Beijing, China |
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| Abstract: | The mechanism of fatigue life improvement for damaged and undamaged copper film specimens with thickness of 25 um was investigated by laser surface irradiation under optimal parameters of laser irradiation at different loading levels. The results showed that the degree of improvement in fatigue life for the damaged specimens is more evident when the applied nominal stress was larger. The hardening induced by laser irradiation and a smooth surface feature can be obtained after the laser irradiation treatment, which results in fatigue life to be extended. A fatigue life prediction method was proposed by the view of equivalent stress. The predicted lives by the proposed prediction method were in good agreement with the experimental results. |
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| Keywords: | healing fatigue damage laser surface irradiation copper film fatigue life prediction |
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