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针对三参数应力-寿命模型,提出了广义P-S-N曲线参数估计的实现方法。该方法基于广义极大似然法原理,应用相关系数法和数学规划法分别求解均值曲线和均方差曲线参量,然后应用相关系数法求解概率曲线参量。通过对45钢成组法疲劳试验获得的S-N数据的分析,验证了该实现方法的有效性。
According to the three-parameter stress-life model, a method to realize the parameter estimation of generalized P-S-N curve is proposed. The method is based on the principle of generalized maximum likelihood method, the correlation curve method and the mathematical programming method are used to solve the mean curve and the mean square deviation curve parameter respectively, and then the correlation coefficient method is used to solve the probability curve parameter. Through the analysis of the S-N data obtained from the fatigue test of 45 steel grouping method, the effectiveness of this method is verified.