一种角磨机转子轴疲劳寿命及可靠性研究

Analysis of Fatigue Life and Fatigue Reliability of Angle Grinder Rotor Shaft

对一种角磨机转子轴在极端载荷条件工作时的疲劳寿命及可靠性进行了仿真研究。采用Creo建立有限元分析模型,导入ANSYS Workbench对转子轴各个危险截面进行应力分析;采用线性疲劳损伤理论,输入材料40 Cr的S-N寿命曲线,基于疲劳分析模块Fatigue tools对转子轴进行疲劳寿命预测;采用正态概率密度函数为疲劳可靠性的密度函数,进行疲劳可靠性分析;基于模态进行了谐响应分析。结果表明:最大应力部位及危险部位位于转子轴输出端轴承端面过渡圆弧区域,最大应力为226.19 MPa,疲劳寿命约为1.8×10~9周次,可靠度为99.42%,转子轴的静强度、疲劳寿命均满足设计要求,可靠性高及谐响应引起的振幅极不显著。

In this paper,the fatigue life and reliability of angle grinder rotor under extreme load conditions are simulated.The finite element analysis model is established by Creo,and ANSYS Workbench is imported for stress analysis of each dangerous section of the rotor shaft.Based on the linear fatigue damage theory,the S-N life curve of material 40Cr is input,and fatigue life prediction of rotor shaft is carried out based on fatigue analysis module Fatigue tools.Fatigue reliability analysis is carried out by using normal probability density function as the density function of fatigue reliability.Harmonic response analysis is based on modality.Results show that the maximum stress location and dangerous location are at the transition arc region of the bearing end of the rotor shaft output end,with the maximum stress up to 226.19Mpa,fatigue life about 1.8×109 cycles and fatigue reliability up to 99.42%.The static strength and fatigue life of the rotor shaft meet the design requirements,while the fatigue reliability is high,but the amplitude caused by the harmonic response is not significant.