An Experimental Study on the Fatigue Crack Propagation Behavior Under Mixed-Mode Single Overload

혼합모드 단일과대하중 하의 피로균열 전파거동에 관한 실험적 연구

  • 송삼홍 (고려대학교 기계공학과) ;
  • 이정무 (고려대학교 대학원 기계공학과) ;
  • 홍석표 (고려대학교 대학원 기계공학과)
  • Published : 2003.04.23

Abstract

In this study, retardation behavior of fatigue crack under single overloading of the mixed mode I+II state was experimentally investigated. To produce single overload in the mixed mode I+II state, the compact tension shear (CTS) specimen and loading device were used. The propagation tests for fatigue crack were performed under mode I loading overloading afterwards. We examined the observed deformation aspects, variation of fatigue life and crack propagation rate, and the aspects of retardation behavior from tests. The retardation effect of mixed-mode single overload on fatigue crack propagation behavior was smaller than that of mode I single overload. It has been confirmed that the retardation behavior did not immediately appear and the retardation length was short when the component of mixed-mode overload was changed.

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