Residual strength and life prediction of composites based on static strength distribution parameters
To reveal the relationship of residual strength and fatigue life with initial static strength distribution parameters,calculation models of residual strength and fatigue life based on initial static strength distribution parameters are constructed.The number of layers,ply thickness and ply angle of the composite structure are not involved in the process of model construction,so the models have strong adaptability.The model parameters can be obtained from a static test and a residual strength test,thus the test cost of the proposed method is lower than that of a fatigue test.The residual strength and fatigue life are related to the variation coefficient and distribution parameters of the initial static strength.When the initial static strength obeys the Weibull distribution,the fatigue life also obeys the Weibull distribution,which can provide a reference for fatigue reliability.The example shows that the maximum error of the residual strength calculation result is-1.58％and the fatigue life fits well with the test data.
万方数据
维普
