Comparison of Oil Film Thickness on Rolling Motion and Sliding Motion

用光学干涉法观测了钢球与蓝宝石圆盘之间形成的弹流油膜。本研究采用石蜡基础油、合成油和牵引油作为润滑油。然后考察了滑动速度对各油液弹流动膜的影响。实验表明，滑移率越大，油膜厚度越小，油液性质影响油膜减薄的速度。这一实验结果可以用弹流润滑的理论计算来解释，该理论计算考虑了粘性加热的影响和Eyring粘度的影响。

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.