旋转支承钢轮应力分析

Stress Analysis of Turntable Support Wheels

摘要:

以Hertz弹性接触理论和曲梁理论为基础，分析了回转支承空心钢轮的圆周应力对轮轨接触von Mises应力峰值及其位置的影响，通过采用平面应变有限元的进一步分析表明，降低钢轮截面梁高可以提高钢轮的径向柔度，同时圆周应力可以有效地抑制接触正应力,提高钢轮接触强度，但可能使钢轮接触区内von Mises应力峰值点从中间向两侧分离，导致应力循环次数翻倍,影响疲劳强度.至于对接触区内钢轮的剪应力和钢轨的von Mises应力，截面梁高的变化对峰值和位置的影响则不大.

Abstract:

Based on the Hertz contact theory and curve beam theory,an analysis is made of the influence of the circumferential stress of the turntable support hollow wheels on the von Mises stress peak value and location of the wheelrail contact.A further analysis with planer strain finite element shows that the decreasing wheel section height can improve the wheel flexibility,contact normal stress is suppressed and the wheel strength is enhanced.On the other hand,the peak location of von Mises stress may split from central contact area,as a result,the stress circulation is doubled and wheel fatigue strength is affected.As for the wheel shear stress and rail von Mises stress,the variation of wheel section height has little influence on the peak value and location.