疲劳寿命实验曲线拟合方法选择研究

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Investigations on Selection of Method to Fit Lab-Test Fatigue Life Curve

Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 疲劳寿命的分散性影响其实验曲线拟合方法的选择,通过引入极差离散系数CR,根据实验所取的不同应变水平或者应力水平下对应的CR最大值的大小,确定曲线拟合采用的最优拟合方式,并采用该原则对疲劳寿命实验数据进行曲线拟合。拟合结果表明,拟合方法选取原则有利于优化疲劳寿命实验曲线拟合。
- 疲劳寿命分散性 /
- 极差离散系数CR /
- 疲劳寿命实验曲线拟合方法
Abstract: The scatter of fatigue life is a factor considered for fitting lab-test fatigue life curves.By leading into diversity coefficient CR,the rule of selection of method to fit lab-test fatigue life curve was established with the value of maximum CR correspond to kinds of S/N the experiment used.Lab-test fatigue life data was fitted to curves according to the rule,and it indicates that the rule can improve the curve fitting.
- Scatter of fatigue life /
- Diversity coefficient CR /
- Method to fit lab-test fatigue life curve