Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Effects of Re-Peening on the Compressive Residual Stress and Fatigue Life of Al7075-T6

Al7075-T6의 압축잔류응력 및 피로 수명에 미치는 재피닝의 효과

  • Oh, Sung-Hun (Dept. of Mechanical Engineering, Graduate School of Seoul National University of Science and Technology) ;
  • Lee, Yong-Sung (Center for Energy System Research, Seoul National University of Science and Technology) ;
  • Cheong, Seong-Kyun (Dept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • Received : 2016.04.06
  • Accepted : 2016.07.06
  • Published : 2016.08.15
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Abstract

The effects of re-peening on the compressive residual stress and fatigue life of Al7075-T6 were investigated. The compressive residual stress induced on the surface of components by shot peening is known to increase the fatigue life. However, the fatigue load relaxes the compressive residual stress of components. Re-peening is a technique to again induce the relaxed compressive residual stress and increase the total fatigue life of components. In this study, the re-peening process was applied to fatigue-loaded specimens. The compressive residual stress and fatigue life were examined for re-peened specimens with fatigue ratios of 30%, 50%, and 70%. The results showed that the compressive residual stress of the specimens was relaxed under the fatigue load. The re-peening process significantly increases the compressive residual stress and total fatigue life.

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References

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