Comparative analysis of statistical methods on B-base values of composites
In CMH-17G,the calculation process for the B-base value single-point method has been compre-hensively updated,mainly focusing on the selection of statistical models and the correction of discrete coefficients.In order to study the statistical method of B-base value,two kinds of open-hole tensile tests of T800 carbon fiber resin matrix composites with two ply ratios are planned,and their open-hole tensile strength values in room temper-ature dry state and low temperature dry state are obtained.By studying the calculation flow of B-base value under normal distribution,Weibull distribution and log normal distribution respectively,the B-base value of composites under different statistical models are obtained.The research results show that the B-base value calculated by normal distribution is on average 3%higher than that calculated by Weibull distribution.By using the discrete coefficient correction method specified in CMH-17G compared to the uncorrected discrete coefficient,the average B-base val-ue decreased by 9%,compensating for the variability that was not manifested in the identification test and further ensuring the safety of composites structures.
万方数据
维普
