단일과대하중의 작용모드 변화가 피로균열의 전파거동에 미치는 영향

Effects with the Variation of Single Overload mode on Propagation Behavior of Fatigue Crack

  • 송삼홍 (고려대 기계공학과) ;
  • 이정무 (고려대 공학기술연구) ;
  • 신승만 (고려대 대학원 기계공학) ;
  • 홍석표 (고려대 대학원 기계공학) ;
  • 서기정 (고려대 대학원 기계공학과)
  • 발행 : 2003.06.01

초록

In this study, retardation behavior of fatigue crack under single overloading of the mixed mode 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 and mixed-mode loading overloading afterwards. We examined the observed deformation aspects, the 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. Also the loading modes of variable and constant amplitude loads have influence on the retardation behavior of fatigue cracks.

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