升降法试验C-R-S曲线及疲劳极限研究  

Study on C-R-S curves of up-and-down test and fatigue limit stress

作　　者：边新孝[1] 李威[1] 邱丽芳[1] 谈嘉祯[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083

出　　处：《北京科技大学学报》2010年第3期380-383,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50375018)

摘　　要：为获得安全可靠的疲劳极限,提出了处理升降法试验数据置信限-可靠度-应力(C-R-S)曲线方法.把升降法的应力水平和可靠度作为随机变量,进行了最优分布检验和参数估计,确定置信限,按三参数Weibull分布、采用最小二乘法拟合C-R-S曲线,获得具有一定置信限和可靠度的疲劳极限.通过38SiMnMo调质齿轮弯曲疲劳强度升降法试验,获得置信限为95%、可靠度为99%的弯曲疲劳极限应力为283.76MPa,位于GB3480极限应力框图内,表明该方法是可行的.A technique for dealing with confidence limit-reliability-stress （C-R-S） curves of up-and-down test was presented to obtain a more accurate endurance limit.Firstly,a distribution hypothesis was tested and its parameters were estimated with regard to the random variables of stress level and reliability.According to 3-parameter Weibull distribution,C-R-S curves were fitted by the least square method.Lastly,the endurance limit was obtained concerning reliability.The endurance limit with a confidence limit of 95% and a reliability of 99% was deduced as 283.76 MPa from up-and-down test of gear tooth bending tests on the quenched and tempered alloy steel 38SiMnMo.This result falling into the square chart of Chinese standard GB3480 can verify the technique presented.

关 键 词：齿轮 疲劳极限 升降法 可靠度 置信限 

分 类 号：TB114[理学—概率论与数理统计]