Acceleration and retardation of fatigue crack growth rate due to room temperature creep at crack tip in a 304 stainless steel
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Room temperature creep (RTC) at a crack tip and its influence on the fatigue crack growth behavior of a 304 stainless steel have been studied at room temperature. A time-dependent deformation has been observed at the crack tips under various stress intensity factors. The deformation increases with increasing stress intensity factor. Either acceleration or retardation of fatigue crack growth rate is found after holding at KRTC, which depends on the load pattern. A demarcation line is observed on the fracture surface following the holding period. This implies that the crack propagation root or mode changed after the hold time.
KeywordsStress Intensity Factor Crack Growth Rate Fatigue Crack Growth Crack Closure Fatigue Crack Growth Rate
The authors gratefully thank financial support by NSFC (National Nature Science Foundation of China) Funding (Project No. 50271013). The authors also like to express their thanks to the State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology for experimental support.
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