study of overload effects on increased fatigue life by meshless local petrov-galerkin method and experimental test

In this paper, the effect of overload on the fatigue life of the c(t) carbon steel astm-a193 samples is investigated. for numerical study, a meshless local petrov-galerkin (mlpg) method is used to predict fatigue crack propagation for cyclic loading with overload. for this purpose, the effective stress intensity factor (sif) is introduced as a function depending on cyclic load in the presence of variable amplitude. sif has been calculated by enriching the weight function. then, the fatigue crack propagation equation is calculated with and without overload. in this study, the mlpg method is extended for predicting fatigue crack propagation rate when an overload occurs. the results show the effect of overload delay on the next cycles. finally, for evaluating this numerical method, experimental methods are applied. the result from the mlpg method has a good agreement with the experimental result.