摘要
提出了一种拟合材料疲劳 S-N曲线的加权最小二乘法 ,各应力水平下的拟合点的权重反比于均值置信区间的长度。两个算例结果表明 :本文方法较好地考虑了 S-N曲线分散性的物理特性。
An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coincides with the physical characteristics of the fatigue life scatter. Two examples demonstrate the method. It is shown that the method has better accuracy and reasonableness compared with the usual least square method.
基金
中国博士点基金 (2 0 0 2 0 2 870 2 2 )资助项目
航空科学基金 ((0 3 A5 2 0 0 5 ) )资助项目~~
