한국표면공학회지 (Journal of Surface Science and Engineering)

  • 제36권6호
  • /
  • Pages.475-479
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  • 2003
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지

2단쇼트피닝에 의한 피로특성의 향상

The Improvement of Fatigue Properties by 2-step Shot Peening

  • 이승호 (경기공업대학 정밀계측과) ;
  • 심동석 (경기공업대학 정밀계측과)
  • 발행 : 2003.12.01
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초록

In this study, to investigate the effects of 2-step shot peening at the surface of spring steel, tests are conducted on spring steel and shot peened specimens. Various tests are accomplished to evaluate mechanical properties influenced by shot peening process, and fatigue tests are also performed to evaluate the improvement of fatigue strength. And then the residual stresses are examined. The mechanical properties of material did not change so much by shot peening. However, the fatigue strength of notched specimen remarkably increased. In the case of 1-step shot peening, fatigue strength increased by about 20％ than unpeened specimen. Especially, in the case of 2-step shot peening, fatigue strength increased by about 40％, because the residual compressive stress at surface was higher than that of 1-step shot peened specimen. The fatigue strength and life are closely related to the value and position of maximum compressive residual stress by shot peening.

키워드

참고문헌

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