期刊
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
卷 27, 期 7, 页码 979-999出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1056789517719117
关键词
S-N curves; mixture distribution; Bayes inference; fatigue limit; damage mechanics
资金
- National Natural Science Foundation of China [51675324]
- Fund for Talents Development by the Shanghai Municipality, China
This article aims at modeling unified S-N curves based on multifailure modes and stress ratios. Heterogeneous mixture distributions are used to describe life distribution of multifailure modes. Bayes clustering is applied to cluster failure data to avoid convergence to global optima. Derived from regression analysis, failure data are compensated by nonrandom error. The relationship between distribution parameters and stress is established, and the ultimately unified probabilistic S-N curve is modeled. Two assumptions are presented to modify an original S-N curve model with varied stress ratios. The first one is to take into account the effects of low-amplitude load exercising, which we call results in the pseudo-fatigue damage. The other one is to set up probability density function of fatigue limit considering uncertainty. Combined with material parameters modification, thus a new modified and unified S-N curves model is available for not only researchers, but engineers as well.
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