粗糙表面基于G-W接触的三维瞬态热结构耦合

TRANSIENT COUPLED THERMO-MECHANICAL ANALYSIS OF ROUGH SURFACE BASED ON G-W MODEL

工程表面是粗糙的,其对磨损有较大影响。为了研究磨损过程的热动力学,文中基于G-W(Greenwood-Wil-liamson)接触模型,将两个粗糙表面简化为一规则形状微凸体与一理想平面,分析在移动热源作用下接触面的边界条件,着重考虑摩擦滑动过程中两物体的弹性变形以及摩擦接触温度与接触区域应力的耦合问题,利用热—结构顺序耦合建立三维瞬态有限元计算模型。从而揭示粗糙表面滑动摩擦副的温度和热应力分布规律,为进一步研究热—机械失效问题及磨损机理奠定理论基础。

In real engineering, the surfaces are rough. To study the thermodynamics during sliding wear, based on G-W（Green- wood-Williamson） contact model, a thermo-structure coupling model for the rough surface sliding friction is established. In this model, two sliding rough surfaces are simplified to a smooth one and a rough one which has regular asperities. And the boundary condition of the moving source is considered. The model integrates the heat flux coupling between the sliding surfaces and allows the analysis of the effects of elastic deformation. From the numerical analysis the transient stress/temperature fields of the rough surfaces during frictional sliding are obtained. This gives further study on the thermo-mechanical failure and the wear mechanism for theoretical basis.