Numerical Analysis for Contact Mechanics of Coating Rolling Bearing
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摘要: 基于有限元软件MSC.Marc,建立了单涂层三维圆柱滚子轴承数值计算模型,对接触力学进行了理论分析。研究了不同涂层厚度、不同涂层/基体弹性模量比及不同载荷作用下,涂层轴承接触应力、等效应力及最大切应力布和变化情况。分析结果表明:表面涂层并不能消除滚子端部的应力"边缘效应";随涂层弹性模量的增大,等效应力随之增大,而法向接触应力几乎没有变化,最大剪切应力值不断增大,但所处位置没有变化;适当选择弹性模量较小的涂层,对于提高滚动轴承的疲劳寿命是有利的;随着涂层厚度的增加,等效应力增加而接触应力减小;沿接触中心线方向,接触表面的应力值随涂层厚度的增加而减小;涂层越薄,涂层/基体界面应力变化梯度越大;工作载荷对于涂层轴承的接触应力和等效应力影响规律相似,界面应力随载荷增大而增加。Abstract: Based on finite element with coating were established and software MSC. Marc, the specific simulation model its contact mechanics were analyzed. This paper stress, contact stress and shear stress distribution of cylindrical roller corresponding ing/substrate Young's modulus ratio, different coating thickness and different loading of cylindrical rothng beanng studied the axial equivalent respectively to different coat-by finite element simulation. The simulation results show that the coating cannot reduce or avoid the "sharp edge effect" of stress on the roller end. The axial equivalent stress increases with the increasing of the ratio of coating/substrate Young's modulus. But the ratio of coating/substrate Young's modulus has less effect on the axial contact stress distribution. The peak value of maximum shear stress on coating/substrate increases but the location has no change. With the increasing of coating thickness, the equivalent stress increases, while the contact stress decreases and the surface contact stress decreases. The less thickness may result in the higher interface stress gradient of coating/substrate system. The loading has the same effect on the distribution of equivalent stress and contact stress. And the interface stresses increase with increase of loading.
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Key words:
- coating /
- rolling bearing /
- numerical simulation /
- contact mechanics /
- equivalent stress
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