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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。
A weighted least square method for fitting the fatigue S-N curve is proposed. The weight of the fitted points under each stress level is inversely proportional to the length of the mean confidence interval. The results of two examples show that the proposed method considers the physical properties of dispersion of S-N curve well.