Probabilistic fatigue life prediction methodology for notched components based on simple smooth fatigue tests |
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| Authors: | Z R Wu X T Hu Z X Li P P Xin Y D Song |
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| Affiliation: | 1.Department of Engineering Mechanics, Jiangsu Key Laboratory of Engineering Mechanics,Southeast University,Nanjing,China;2.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,China |
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| Abstract: | The methodology of probabilistic fatigue life prediction for notched components based on smooth specimens is presented. Weakestlink theory incorporating Walker strain model has been utilized in this approach. The effects of stress ratio and stress gradient have been considered. Weibull distribution and median rank estimator are used to describe fatigue statistics. Fatigue tests under different stress ratios were conducted on smooth and notched specimens of titanium alloy TC11. The proposed procedures were checked against the test data of TC11 notched specimens. Prediction results of 50 % survival rate are all within a factor of two scatter band of the test results. |
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