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- Title
Nonlinear time‐varying fatigue reliability analysis based on the improved toughness exhaustion model.
- Authors
Gao, Kai; Liu, Gang
- Abstract
The state function based on fatigue accumulation model has a great influence on accuracy of fatigue reliability analysis of components. A nonlinear fatigue accumulation model considering the interaction of loads is proposed in this paper. The square ratio of front and back loads is presented as a new load interaction factor and embedded into the conventional toughness exhaustion model; thus, this improved model can reflect the load sequence and interaction effect simultaneously. Moreover, 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 the proposed model is accurate. Furthermore, accuracy and efficiency of the time‐varying fatigue reliability analysis using the proposed model is validated using experimental data from a carbon steel test and a helical compression spring test.
- Subjects
CARBON steel; HELICAL springs; FATIGUE cracks
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2021, Vol 44, Issue 12, p3482
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13585