DOI QR코드

DOI QR Code

Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-indentation

홀확장과 링압인 동시적용에 의한 피로균열지연

  • Yu, Jin-Sang (Dept.of Mechanical Engineering, Graduate School of Myongji University) ;
  • ;
  • ;
  • ;
  • 유진상 (명지대학교 대학원 기계공학과) ;
  • ;
  • ;
  • ;
  • Published : 1997.01.01

Abstract

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.

Keywords

Fastener Hole;Cold-Expansion;Ring-Indentation;Residual Stress;Stress Intensity Factor;Fatigue Crack Retardation;Weight Function