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혼합모드 단일과대하중 하의 피로균열 전파거동에 관한 실험적 연구
송삼홍(Sam-Hong Song),이정무(Jeong-Moo Lee),홍석표(Suck-Pyo Hong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this study, retardation behavior of fatigue crack under single overloading of the mixed mode I+II state<br/> was experimentally investigated. To produce single overload in the mixed mode I+II state, the compact<br/> tension shear (CTS) specimen and loading device were used. The propagation tests for fatigue crack were<br/> performed under mode I loading overloading afterwards. We examined the observed deformation aspects,<br/> variation of fatigue life and crack propagation rate, and the aspects of retardation behavior from tests. The<br/> retardation effect of mixed-mode single overload on fatigue crack propagation behavior was smaller than that<br/> of mode I single overload. It has been confirmed that the retardation behavior did not immediately appear and<br/> the retardation length was short when the component of mixed-mode overload was changed.