대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)
- 제21권2호
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- Pages.305-316
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- 1997
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
홀확장과 링압인 동시적용에 의한 피로균열지연
Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-indentation
- 유진상 (명지대학교 대학원 기계공학과) ;
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- Yu, Jin-Sang (Dept.of Mechanical Engineering, Graduate School of Myongji University) ;
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- 발행 : 1997.01.01
초록
A more efficient method for obtaining the fatigue life enhancement of a structure member with fastener holes is described. It is based on the combined process of cold-expansion and ring-indentation. Residual stresses were induced onto premachined holes using ring-indentation process near the fastener hole combined with cold-expansion. And residual stresses at the vicinity of a hole were evaluated using a fracture mechanics approach. The compressive residual stresses were larger using the combined process than is in the case of simple cold-expansion. Fatigue testing of aluminum specimens showed that the fatigue crack growth retardation emanating from a circular hole was greater for the combined process than for a simple cold-expansion alone.
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