机车牵引齿轮接触应力及疲劳失效微观分析

摘要

According to the real parameters of 20CrMnMo locomotive traction gear,established the finite element model of gear pair with ANSYS. The real contact stress was simulated. The results showed that the largest contact stress existed contact surface and diffusing equivocally with the shape of oval, microscopic fatigue crack was generated to a varying degree in surface. Finally fatigue failure occurred such as wear and crack. By analysis microcosmic mechanism, damaged structure was found in crack fraction. Analysis of finite element was examined rightly.%根据20CrMnMo材料的牵引齿轮真实参数,利用ANSYS软件建立有限元模型,对其接触应力进行分析得出:最大接触应力发生在齿面接触点位置,且以等值椭圆线向外扩散,使齿面产生不同程度的微裂纹,最终导致磨损和剥落等疲劳失效形式发生；通过微观组织分析,发现剥落裂纹部分的组织受损较重,验证了有限元分析的正确性.