Comparison and Verification of Unified Fatigue Threshold Models

doi:10.3901/JME.2020.24.081

Abstract

Abstract: Aiming at the effect of stress ratio on fatigue crack growth and fatigue threshold, the establishment process of Zhu-Xuan model and Kwofie-Zhu model are described, based on the unified thought of crack closure and crack propagation driving force mechanism, and the models are verified by using fatigue crack growth data of 25Cr2Ni2MoV rotor steel welded joint. Results show that both the two models can well predict fatigue cracking in the near threshold and Paris regimes. The Zhu-Xuan model has a simpler form and is universal for CrMoV steel with an error of fatigue threshold prediction below 10%, while the prediction by the Kwofie-Zhu model is more accurate, and the application involves parameter solving, and is thus more complicated. It is demonstrated that the unified mechanistic modeling of crack closure and crack growth driving force to describe stress ratio dependence of fatigue crack growth behavior is reasonable and feasible with good accuracy.

Key words: fatigue crack growth, stress ratio, fatigue threshold, crack closure, crack growth driving force

CLC Number:

TG115

SHEN Xuecheng, HUANG Yuhui, ZHU Mingliang, XUAN Fuzhen. Comparison and Verification of Unified Fatigue Threshold Models[J]. Journal of Mechanical Engineering, 2020, 56(24): 81-87.

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