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Fatigue life prediction of damaged copper film by laser irradiation repairing
Author(s) -
Ren C.G.,
Shang D.G.,
Sun Y.J.,
Guo Y.B.,
Chen T.
Publication year - 2015
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12235
Subject(s) - irradiation , materials science , laser , hardening (computing) , copper , composite material , stress (linguistics) , structural engineering , metallurgy , optics , engineering , linguistics , philosophy , physics , layer (electronics) , nuclear physics
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.