基于表面凹陷现象的非牛顿热弹流润滑分析

Analysis of non-Newtonian Thermal Elastohydrodynamic Lubrication Based on Surface Dimple Phenomenon

求出了非牛顿流体点接触热弹流润滑问题的完全数值解,并对玻璃-钢点接触的表面凹陷现象进行了理论及实验分析.结果表明:牛顿流体模型过高地估计了温度-粘度楔效应,而Ree-Eyring非牛顿流体模型能更好地解释温度-粘度楔效应.

A complete numerical solution of the nonNewtonian thermal elastohydrodynamic lubrication (EHL) in point contact was obtained. Thus the dimple phenomenon in the point EHL contact of a glass disksteel ball was experimentally investigated using optical interferometry technique. The traction coefficient was measured, and the experimental thicknesses of the lubrication films were compared with the numerical results of the corresponding thermal Newtonian and nonNewtonian EHL solutions. Results indicate that the depth of the dimple and the traction coefficient of thermal elastohydrodynamic lubrication cannot be accurately predicted based on the Newtonian model and the effect of the temperatureviscosity wedge is overestimated in this case, while the surface dimple phenomenon can be well simulated based on ReeEyring model.