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Simulation and verification of master S-N curves of titanium alloy welded structures based on bootstrap method
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Simulation and verification of master S-N curves of titanium alloy welded structures based on bootstrap method
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Simulation and verification of master S-N curves of titanium alloy welded structures based on bootstrap method
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Journal Article
Simulation and verification of master S-N curves of titanium alloy welded structures based on bootstrap method
2022
Overview
In the small sample fatigue test space, in order to obtain the master S-N curves of each reliability of the titanium alloy welded structures. Firstly, the Bootstrap method is combined with the equivalent structural stress to determine the minimum number of samples under each level of equivalent structural stress, and the appropriate resampling times are obtained through residual analysis. Secondly, based on the fatigue test data of titanium alloy welded joints with different plate thicknesses, materials, types and stress ratios, the linear regression model of master S-N curves are determined by using the traditional group method and Bootstrap method, and its reliability is 99%, 95%, 84%, and 50% respectively. Finally, the comparative analysis shows that the titanium alloy fatigue test samples obtained by Bootstrap method tends to be more stable, which improves the fitting degree of the titanium alloy fatigue life test data and the accuracy of the fatigue life prediction when the sample is small. A more accurate regression model of the master S-N curves of titanium alloy welded structures was obtained and verified.
Publisher
SAGE Publications,Sage Publications Ltd,SAGE Publishing
