Using an optical interferometric technique, the grease film distribution under a pure rolling reciprocating motion is observed on a ball-disk test rig, to explore the transient response of grease, which is expected to fill the contact with thickener fiber and run for a long time under steady-state conditions. It is found that the reciprocating motion reduces the accumulation of the thickener fiber gradually with time. The maximum film thickness forms around the stroke ends. After 1,000 working cycles, very severe starvation occurs so that either the central or minimum film thickness becomes nearly constant over one working period. Thus, the life of grease lubrication under a transient condition is far below that under steady-state conditions. However, it is also found that by selecting a smaller stroke length, the thickener fiber spreads out in the contact instead of being removed from the contact at the 1,000th working period. When increasing the maximum entraining speed of the reciprocating motion to a certain value, during which the thickener fiber is not expected to accumulate under a steady-state condition, severe starvation occurs very quickly, causing surface damage.

中文翻译：

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纯滚动往复运动时低速下脂膜的响应

使用光学干涉技术，在球盘试验台上观察纯滚动往复运动下的润滑脂膜分布，以探索润滑脂的瞬态响应，该瞬态响应有望填充增稠剂纤维并长时间运行在稳态条件下。发现往复运动随着时间逐渐减少了增稠剂纤维的积累。最大薄膜厚度在行程末端附近形成。在1,000个工作循环后，会出现非常严重的饥饿现象，因此中心或最小膜厚度在一个工作周期内几乎变得恒定。因此，在瞬态条件下脂润滑的寿命远低于稳态条件下的寿命。但是，还发现通过选择较小的行程长度，增稠剂纤维会在接点中散开，而不是在第1000个工作周期从接点中移出。当将往复运动的最大夹带速度提高到某个值（在此值期间不会在稳定状态下聚集增稠剂纤维）时，严重的饥饿会很快发生，从而导致表面损坏。