Comparison of Oil Film Thickness on Rolling Motion and Sliding Motion

用光学干涉法观察了钢球与蓝宝石圆盘间形成的弹流油膜。在这项研究中，采用石蜡基础油，合成油和牵引油的润滑剂。研究了滑动速度对油膜的影响。实验结果表明，滑动比的增大有减小油膜厚度的趋势，润滑油的流体性质影响油膜厚度减小的速率。这一实验结果可以用考虑粘性加热效应和Eyring粘度效应的弹流润滑理论计算来解释。

The elastohydrodynamic oil films formed between a steel ball and a sapphire disk were observed by an optical interference method. In this study, a paraffin base oil, a synthetic oil and a traction oil were adopted for lubricants. Then the influence of a sliding velocity on the elastohydrodynamic film of each oil was investigated. The experiment makes it evident that the increase of the sliding ratio tends to reduce the film thickness, and fluid properties of the oils influence the rate of the film thickness reduction. This experimental result can be explained by the theoretical calculation of the elastohydrodynamic lubrication which takes account of the effect of the viscous heating and the effect of the eyring viscosity.