Fatigue life prediction of damaged copper film by laser irradiation repairing

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 fat...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2015-03, Vol.38 (3), p.330-339
Main Authors: Ren, C.-G., Shang, D.-G., Sun, Y.-J., Guo, Y.-B., Chen, T.
Format: Article
Language:English
Subjects:
copper film
Fatigue life
fatigue life prediction
healing fatigue damage
laser surface irradiation
Lasers
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Summary: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.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12235