点接触润滑状态转化的实验观察

利用球-盘接触润滑油膜厚度的光干涉测量法，通过卷吸速度或载荷的改变实验研究了弹性流体动力润滑与流体动力润滑转化过程中油膜厚度的变化规律。实验结果显示这2种润滑状态之间存在明显的过渡区。与已有的理论一致，在弹性流体动力润滑区和流体动力润滑区，油膜厚度与卷吸速度或载荷在对数坐标中呈直线关系。在两者的过渡区，固体表面的弹性变形量随卷吸速度或载荷的变化发生明显的变化，油膜厚度与速度或载荷的关系不再为对数坐标中简单的线性关系。使用已有的润滑状态区理论不能得到实验观测到的润滑状态的转化过渡区。

Experimental Study of Lubrication Regime Transition in Concentrated Lubricated Contacts

The transition between elastohydrodynamic lubrication and hydrodynamic lubrication in a ball-disc contact was experimentally studied. Different lubrication regimes were achieved by applying different loads and entrainment speeds. The results show that there is a transition region between the elastohydrodynamic lubrication and hydrodynamic lubrication regimes. In elastohydrodynamic lubrication and hydrodynamic lubrication, the film thickness bears a linear relationship to the entrainment speed or the load in a log-log scale. However, in the transition region due to the obvious change in elastic deformation with entrainment speeds or loads, there is not a linear relationship between the film thickness and entrainment speeds or loads in a log-log scale. The experimental transition region cannot be predicted by the existing theory for lubrication regime identification.