摘要
通过加权最小二乘法拟合各应力水平疲劳寿命的分布参数,通过对疲劳寿命的均值和标准差与应力水平的线性回归分析,得到回归后的各应力水平的疲劳寿命均值及标准差,并应用其反求疲劳寿命分布的统计参数,进而获得具有高度线性相关性的各寿命分位点数据,拟合不同置信度下的P-S-N曲线。通过应用本文方法和国标方法对实验数据的拟合结果对比分析,本文方法拟合的P-S-N曲线具有较高的精度,并且得到相对保守的结果。通过回归分析后得到了统计参数与应力水平的函数,为应用应力-寿命干涉模型计算系统可靠度提供了基础。
Distribution parameters are obtained by the weighted least square method for each stress level,then the means and standard deviations of fatigue life data are calculated at different stress levels.By the linear regressions between the means/standard deviations and stress levels,the distribution parameters are recalculated according to the means and standard deviations after the linear regressions.Then,the fatigue life data with any reliability can be calculated according to the distribution parameters and the P-S-N curves can be fitted.By the comparisons with other methods,the fitting P-S-N curves have a great accuracy and relatively conservative results.The linear regression functions can be used to obtain the distribution parameters of any stress level for the reliability calculation using the dissimilar-dimension interference model.
作者
白恩军
杨超杰
Bai En-jun;Yang Chao-jie(School of Automotive and Transportation,Shenyang Ligong University,Shenyang 110159)
出处
《内燃机与配件》
2022年第22期102-104,共3页
Internal Combustion Engine & Parts
基金
辽宁省教育厅科学技术研究资助项目(LG202022)。
