机械科学与技术2011，Vol.30Issue(11)：1951-1954,4.
不同载荷频率条件下300M钢疲劳性能研究
Studying on Fatigue Properties of 300M Steel with Different Load Frequencies
摘要
Abstract
With the ultrasonic fatigue test system with the frequency of 20 kHz and the conventional fatigue test system with the frequency of 20 Hz,the fatigue tests of 300 M steel under the stress ratio of are performed in 105~109 cycles and 103~106 cycles respectively.The curves in 103 and 109 cycles are obtained.The test results show that： the fatigue life of the 300 M steel increases with decreasing its stress level;its fatigue failure also occurs when the cycles are more than 107;the horizontal asymptote and stepwise shape of the curves do not appear.The ultrasonic hardening does not happen in the ultrasonic fatigue test;on the contrary,the fatigue properties of the 300 M steel become bad under the ultrasonic loading.Its defect size and stress level have important effects on its fatigue life.The Murakami model predicts the fatigue limit of the 300 M steel very well,its error being lower than 15%.关键词
超声疲劳/300M钢/S-N曲线/超声强化Key words
ultrasonic fatigue/300 M steel/S-N curve/ultrasonic hardening分类
矿业与冶金引用本文复制引用
刘东星,薛红前,邵闯,唐兴龄..不同载荷频率条件下300M钢疲劳性能研究[J].机械科学与技术,2011,30(11):1951-1954,4.基金项目
国家自然科学基金 （）
教育部留学人员科研启动基金项目资助 （）
