钢中最大夹杂尺寸的评估与疲劳强度的预测

ESTIMATION OF THE MAXIMUM INCLUSION SIZE IN STEEL AND PREDICTION OF ITS FATIGUE STRENGT

采用两种极值统计方法 (statisticsofextremvalues ,SEV ;generalizedParetodistribution ,GPD)对某一商用 42CrMo钢的最大夹杂尺寸进行评估 ,并且预测其对应的疲劳强度。与实验结果比较发现 ,两种方法预测的夹杂大小及疲劳强度和超声疲劳实验的结果接近 。

The fatigue behavior and other mechanical properties are influenced by the maximum inclusion in steel. Two methods relating statistics of extremes, i.e., statistics of extreme values (SEV) and generalized Pareto distribution (GPD) are adopted to estimate the maximum inclusion size and the fatigue strength of 42CrMo steel. Comparing with the experimental results, it shows that the estimated results of the two methods are in according with the experimental results. And it also shows that the estimations of the SEV method are more close to the experimental result in small volume of steel.