This study develops a model for the description of surface breaking crack initiation, under starved lubrication condition. Varying from fully flooded to severely starved lubrication condition, impacts of important factors, including surface roughness, contact pressure, and lubricant viscosity, on fatigue life are examined. Surprisingly and interestingly, it is found a lower lubricant viscosity elongates fatigue life when severe starvation occurs, which is opposite to the EHL rule under fully flooded lubrication condition, stating higher viscosity leads to thicker lubrication film and improved fatigue life. However, it is in line with the experimental observation (Cann in Tribol Trans 42(4):867–873, 1999), where film thickness was shown to increase when moving from high viscosity base oil to a lower one under starvation condition.

中文翻译：

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润滑不足条件下接触疲劳建模

本研究开发了一个模型，用于描述缺乏润滑条件下的表面断裂裂纹萌生。从完全淹没到严重缺乏润滑条件，我们检查了重要因素对疲劳寿命的影响，包括表面粗糙度、接触压力和润滑剂粘度。令人惊讶和有趣的是，发现当严重饥饿发生时，较低的润滑剂粘度会延长疲劳寿命，这与完全淹没润滑条件下的 EHL 规则相反，即较高的粘度会导致更厚的润滑膜并提高疲劳寿命。然而，这与实验观察一致（Cann in Tribol Trans 42(4):867-873, 1999），其中在饥饿条件下从高粘度基础油转移到低粘度基础油时，油膜厚度会增加。