动车组空心车轴应力强度因子研究  

Study on Stress Intensity Factors of EMU Hollow Axles

作　　者：余海峰 吴兴文[2] 梁树林[1] 池茂儒[1] YU Haifeng;WU Xingwen;LIANG Shulin;CHI Maoru(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031 [2]西南交通大学机械工程学院,成都610031

出　　处：《机械科学与技术》2024年第1期117-124,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家重点研发计划(2018YFE0201401-01);国家自然科学基金项目(51805450);中国科协青年人才托举工程项目(2019QNRC001);四川省基础研究计划(2020YJ0075)。

摘　　要：为研究动车组空心车轴应力强度因子,首先分析了车轴应力强度因子的影响因素,建立了含裂纹车轴有限元模型,并使用叠加法求解不同载荷下的应力强度因子。然后采用应力外推法和位移外推法计算了应力强度因子,并将计算结果与文献形状因子公式法进行对比。最后根据应力强度因子的一般解析式和位移外推法的计算结果,使用五次多项式对形状因子函数进行拟合,通过设置不同的裂纹深度和载荷验证了形状因子函数和解析式的适用性。结果表明该方法对于求解同一载荷模式下的车轴应力强度因子具有一定的参考价值。In order to study the stress intensity factors(SIFs)for hollow axle of EMU,the influencing factors of the axle SIFs were firstly analyzed.The finite element model for axle with crack was established,and the superposition method was used to evaluate SIFs under different loads.Then,the SIFs were calculated by using the stress extrapolation method(SEM)and displacement extrapolation method(DEM),and the calculation results were compared with that by using the shape factor formula method.Finally,a fifth⁃order polynomial was used to fit the shape factor function according to the general analytical formula of SIFs and calculation results via DEM.The applicability of the shape factor function and the analytical formula was verified by setting the different crack depths and loads.The results indicated the present method had certain reference value for calculating SIFs of axle under the same load mode.

关 键 词：应力强度因子 有限元 叠加法 应力外推法 位移外推法 形状因子 

分 类 号：U270.33[机械工程—车辆工程]