Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)
- Volume 3 Issue 3
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- Pages.79-85
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- 2004
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- 1598-6721(pISSN)
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- 2288-0771(eISSN)
The Effect of Compressive Residual Stress on Fatigue Fracture of the Spring steel
현가장치용 SUP-9강의 피로파괴에 미치는 압축잔류응력의 영향
- Published : 2004.09.30
Abstract
The lightness of components required in automobile and machinery industry is requiring high strength of components. In particular, fatigue failure phenomena, which happen in metal, bring on danger in human life and property. Therefore, antifatigue failure technology takes an important part of current industries. Currently, the shot peening is used for removing the defects from the surface of steel and improving the fatigue strength on surface. Therefore, in this paper the effect of compressive residual stress of spring steel(JISG SUP-9)by shot peening on fatigue crack growth characteristics in stress ratio(R=0 1, R=0 3, R=0 6)was investigated considering fracture mechanics. By using the methods mentioned above, I arrived at the following conclusions: (1) The fatigue crack growth rate(da/dN) of the shot peening material was lower than the unpeening material And in stage I,
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