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Time-varying reliability analysis and fatigue damage life prediction of improved toughness exhaustion model based on probability density evolution method
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  • Nanhai Ye,
  • Zhi Liu,
  • Jing Zhou,
  • Xuehang Bai,
  • Xiaoming Lu,
  • Gongwei Zhao,
  • Huimin Xu
Nanhai Ye
Hunan University

Corresponding Author:[email protected]

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Zhi Liu
Hunan University
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Jing Zhou
Schaeffler Intelligent Driving Technology (Changsha) Co Ltd
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Xuehang Bai
Schaeffler Intelligent Driving Technology (Changsha) Co Ltd
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Xiaoming Lu
Schaeffler Intelligent Driving Technology (Changsha) Co Ltd
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Gongwei Zhao
Hunan University
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Huimin Xu
Hunan University
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Abstract

This paper proposed an improved toughness exhaustion model on the basis of the toughness exhaustion model. Specifically, in this model, a new logarithmic function of the stress amplitude is adopted into the damage equivalence equation, which can reflect the influence of load interaction. In addition, the fatigue state function using the improved model is constructed and analyzed by the probability density evolution method. Then, experimental data of four materials are used to verify the proposed model, and results show that the residual life fraction predicted by this model is accurate. Furthermore, the time-varying fatigue reliability of the proposed model is validated using experimental data of two materials. The results show that the improved model has better applicability and higher accuracy.