摘要
采用PX-100高频疲劳试验机,采用升降法在振动频率为100~120 Hz、拉-压对称应力的条件下测定车轮轮辐钢S500LF的疲劳极限,并用数理统计方法分析确认疲劳极限为291 MPa.此值作为母体50%存活率下的疲劳极限估计量时,以95%的置信度,相对误差不超过±5%.在测定的疲劳极限基础上,采用多试样法测得不同应力水平下的疲劳寿命,据此绘制出应力-寿命关系曲线,通过回归得到应力-寿命曲线方程.对试样断口进行了理论分析,结果表明试验钢韧性良好.
An experiment was carried out on the high frequency fatigue testing machine PX-100 and with the method of progressively increasing/decreasing stress to determine the fatigue limit of wheel spoke steel S500LF on the condition that the vibration frequency was 100~120 Hz and the tensile-compressive stress was symmetrical.The fatigue limit was 291 MPa by the mathematical statistical analysis.When this value was used as an estimator of the maternal 50%survival rate,the relative error was no more than±5%with a confidence level of 95%.The fatigue life at different stress levels was measured by the multi-sample method according to the measured fatigue limit.Based on this,the S-N relation curve was drawn and the S-N curve equation was regressed.Besides,the fracture of the samples was analyzed theoretically,and the result shows the good toughness of the test steel.
作者
高彩茹
朱长友
张大伟
杜林秀
GAO Cai-ru;ZHU Chang-you;ZHANG Da-wei;DU Lin-xiu(State Key Laboratory of Rolling Technology and Automation,Northeastern University,Shenyang 110819,China;Sheet Research Institute,Shougang Research Institute of Technology,Beijing 100043,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第8期1148-1152,共5页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2015AA03A501).
