高速动力车轴应力谱分析及疲劳寿命可靠性预测

Stress spectrum analysis and fatigue life prediction about wheel axle of high-speed power car

结合车辆系统在随机轨道谱激励下的动力响应与疲劳强度理论,以"中华之星"高速动力车轴为例,建立了动车系统的非线性动力学模型,仿真车辆在典型线路上的运行特性,获取作用于轮轴上的随机载荷谱。引入车轴材料的非线性本构关系,进行轮轴的有限元分析,得到车轴关键部位的应力时间历程,对其进行统计分析后得到各危险点的应力谱。在此基础上,运用局部应力应变法和累积损伤理论进行了车轴疲劳寿命估算和可靠性分析,得到不同可靠度下的疲劳寿命。当可靠度为0.9时,其疲劳寿命为16年。

Combining the dynamic fatigue strength theory,the wheel the nonlinear dynamics model typical railway was simulated, Based on the nonlinear random response of vehicle under the excitation axl of the e of China Star high-speed pow power car was set up, the ru and the random loads acte cyclic constitution of the ax the wheelset was established, the stress time history of random loads was calculated, and the stress spectrum of h er car of track sp was taken ec as nning property of trum with example, vehicle on ~btained. model of nder the obtained ory, the ility was d on vehicle wheelsets were o le material, the finite element key region of the wheelset u azard sections of the axle was by statistical analysis. Using fracture mechanics theory and accumul fatigue life of the axle was predicted, and its reliability was analysed. 0.9, the fatigue life was 16 years. 7 tabs, 4 figs, 15 refs.