Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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Fatigue crack Propagation Rate and Crack Opening behavior in Weldment Observed by Laser ISDG Method

레이저간섭변위 게이지로 관찰한 용접재에서의 피로균열 열림거동과 피로균열 전파속도

  • 송삼홍 (고려대학교 기계공학과) ;
  • 김현 (삼성중공업(주) 시험연구팀) ;
  • 최진호 (고려대학교 대학원 기계공학과)
  • Published : 1995.04.01
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Abstract

The constant .DELTA.K fatigue tests are performed in SS41 and its weldments to investigate crack opening behavior and fatigue crack propagation behavior at each parts of weldment and its boundary layer. The weldments were annealed after welding for the purpose of relieving residual stress. Every weldments has notch at weld metal zone, and fatigue crack propagates from weld metal zone to vase metal zone perpendicular to weld line. The Laser ISDG method is used in order to determine the crack opening ratio, this method is more precise than indirect measurement method, and faster and easier than other direct measurement method.

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