Tribology Letters ( IF 2.9 ) Pub Date : 2021-09-16 , DOI: 10.1007/s11249-021-01506-x Yaswanth Sai Jetti 1 , Alison C. Dunn 1
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The non-conforming rolling contact under high loads results in considerable plastic deformation of the surface. This surface plastic flow is studied using a twin-disk tribometer, and the observed deformation as a function of the number of rolling cycles is classified into three distinct stages. Substantial geometric changes are observed in the initial stage and during this process, the contact type changed from Hertzian to non-Hertzian in the first few cycles, and then it changed from non-Hertzian back to near Hertzian by the end of this stage. A semi-analytical model is hence used to perform the contact analysis. Special traction elements are employed near the surface discontinuities within the contact area to resolve singularities. The contact area is observed to change from elliptic to a near-rectangular shape and the evolution of the contact parameters during this process is reported. Shakedown limits are obtained at different instants of the deformation process using Melan’s theorem. It is observed that the high stresses near the surface discontinuities greatly affect the shakedown limits. The actual stress state is observed to move on a shakedown map until it goes below the shakedown limit but above the elastic limit as predicted.
Graphic Abstract
中文翻译：
使用半解析数值模型对演化非赫兹滚动接触进行振动分析
高载荷下的非一致性滚动接触导致表面相当大的塑性变形。使用双盘摩擦计研究这种表面塑性流动，观察到的变形作为滚动循环次数的函数被分为三个不同的阶段。在初始阶段观察到实质性的几何变化，在这个过程中，接触类型在前几个周期从赫兹变为非赫兹，然后在这个阶段结束时从非赫兹变回接近赫兹。因此，使用半分析模型来执行接触分析。在接触区域内的表面不连续点附近采用特殊的牵引元件来解决奇异点。观察到接触面积从椭圆形变为近矩形形状，并报告了此过程中接触参数的演变。使用梅兰定理在变形过程的不同时刻获得振动限制。据观察，表面不连续处附近的高应力极大地影响了安定限制。观察到实际应力状态在安定图上移动，直到它低于安定极限但高于预测的弹性极限。
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