Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)
- Volume 2 Issue 4
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- Pages.67-72
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- 2003
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- 1598-6721(pISSN)
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- 2288-0771(eISSN)
2-Step Shot Peening Process for the Improvement of Fatigue Crack Growth Properties
균열 특성 개선을 위한 2단 쇼트피닝 가공
- Published : 2003.12.30
Abstract
In this study, to investigate the effects of 2-step shot peening at the surface of spring steel, crack growth tests are conducted on spring steel and shot peened specimens. And then the residual stresses and fractographs are examined. The crack growth equation that can describe the whole crack growth behavior is used to evaluate the experiment results. The results show that fatigue crack glows slowly in the shot peened specimen than in the unpeened. And in the case of the 2-step shot peened specimen the initial stress intensity factor range and the fracture toughness is higher than the unpeened specimen due to the compressive residual stress. Fractographs show that the compressive residual stress of the surface suppress the fatigue crack opening and consequently slow crack growth rates.
Keywords
- 2-step Shot Peening Process;
- Compressive Residual Stress;
- Fatigue Crack Growth;
- Initial Stress Intensity Factor Range;
- Fracture Toughness;
- Crack Opening
- 2단 쇼트피닝 가공;
- 압축잔류응력;
- 피로균열진전;
- 초기응력확대계수범위;
- 파괴인성;
- 균열열림;