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Recovery of Fatigue Damage and Life Prediction by Laser Irradiation Healing Treatment for Copper Film

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Abstract

A fatigue life prediction method was investigated after healing fatigue damage by excimer laser irradiation treatment for the damaged copper film. First, the variations of residual fatigue life and strain range for the damaged specimens after laser irradiation healing treatment were analyzed. The results showed that the fatigue damage can be effectively healed by laser irradiation for copper film. The presented healing phenomenon during laser irradiation process showed that the recovery of fatigue damage can result in the improvement in fatigue life for the damaged copper film. Then, based on the fact that the strain concentration factor of copper film had not been changed before and after laser irradiation treatment, a residual fatigue life prediction method was proposed by the local stress transformation. The predicted residual fatigue lives by the proposed method agreed well with the experimental results for copper film after laser irradiation treatment.

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Abbreviations

σ :

Cyclic stress

N :

Fatigue life

C :

Material constant

m :

Material constant

σ max :

Maximum stress

K ′ :

Cyclic strength coefficient

n ′ :

Cyclic strain hardening exponent

E :

Elastic modulus

K ′ɛ :

Strain concentration factor

K ′ɛ0 :

Strain concentration factor before laser irradiation treatment

K ′ɛt :

Strain concentration factor after laser irradiation treatment

Δɛ0 :

Local strain ranges of specimens before laser irradiation treatment

Δɛ t :

Local strain ranges of specimens after laser irradiation treatment

Δe 0 :

Nominal strain ranges of specimens before laser irradiation treatment

Δe t :

Nominal strain ranges of specimens after laser irradiation treatment

Δσtrf :

Transferable stress ranges

N r :

Residual lives of specimens healed by laser irradiation treatment

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Acknowledgments

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Nos. 51010006, 11272019, 50975005), and the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20131103120024).

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Authors and Affiliations

  1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, 100124, P. R. China

    Yu-Bo Guo, De-Guang Shang, Xiao-Dong Liu, Chong-Gang Ren, Feng-Zhu Liu, Li-Hong Zhang & Yu-Juan Sun

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  1. Yu-Bo Guo
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  2. De-Guang Shang
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Correspondence to De-Guang Shang.

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Guo, YB., Shang, DG., Liu, XD. et al. Recovery of Fatigue Damage and Life Prediction by Laser Irradiation Healing Treatment for Copper Film. J. of Materi Eng and Perform 24, 106–113 (2015). https://doi.org/10.1007/s11665-014-1265-4

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  • DOI: https://doi.org/10.1007/s11665-014-1265-4

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