• 제목/요약/키워드: Re-peening

검색결과 2건 처리시간 0.014초

피로손상을 받은 SM45C강에 대한 재피닝의 효과 (Effects of Re-Peening on the Fatigue Damaged SM45C Steel)

  • 강진식;서유원;김태형;정성균;신용승
    • 대한기계학회논문집A
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    • 제26권8호
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    • pp.1690-1697
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    • 2002
  • The effects of re-peening on the fatigue damaged material are studied in this paper. The effects of re-peening process on surface hardness, surface roughness, surface compressive residual stress, and fatigue life are investigated. The results can be summarized in brief as follows: The depth of hardening layer was increased by re-peening process. There is no large variation of the surface roughness by re-peening process. The compressive residual stress of shot-peened specimen decreases under the fatigue loading and then increases again by re-peening process. Re-peening process increases the fatigue lifo of shot-peened and fatigue damaged specimen. The increase of fatigue lift under high stress level is much higher than under low stress level.

Al7075-T6의 압축잔류응력 및 피로 수명에 미치는 재피닝의 효과 (Effects of Re-Peening on the Compressive Residual Stress and Fatigue Life of Al7075-T6)

  • 오성훈;이용성;정성균
    • 한국생산제조학회지
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    • 제25권4호
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    • pp.253-257
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    • 2016
  • 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.