Abstract
AbstractThe in-depth study on the performance of steel structure in the fatigue crack propagation stage is conducive to the rational use of high-strength steel. The load ratio reflecting the average stress effect has a great influence on the fatigue crack growth rate. Therefore, in this paper, Walker equation is used to fit the fatigue crack growth rate. Using Bayesian theory and Weibull distribution, the walker equation coefficients of S355 grade steel at 95% guarantee rate are obtained. Based on Walker equation, two-dimensional finite element models with different element types are used to simulate fatigue crack propagation, and the predicted results of different models are compared with the experimental data. Using the subroutine based on Walker equation, and through the extended finite element method and virtual crack closure method, the fatigue crack growth of S355 grade steel is successfully simulated.KeywordsWalker equationBayesian theoryWeibull distribution modelExtended finite element methodVirtual crack closure technique
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