Tribology Letters ( IF 2.9 ) Pub Date : 2021-08-22 , DOI: 10.1007/s11249-021-01498-8 Quentin Allen 1 , Bart Raeymaekers 1
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We use soft elasto-hydrodynamic lubrication simulations to calculate the lubricant film thickness in textured hard-on-soft parallel slider bearings and compare a mass-conserving cavitation model based on the Elrod implementation of the Jakobsson, Floberg, and Olsson (JFO) theory to simplified Reynolds and half-Sommerfeld cavitation models. We determine the optimum texture design parameters that maximize the lubricant film thickness for a range of bearing operating conditions and compare the results obtained with the different cavitation models. We determine that the JFO cavitation model predicts smaller optimum texture aspect ratios than the Reynolds cavitation model, and that the difference between the lubricant film thickness calculated with the different cavitation models increases with increasing texture aspect ratio and decreasing flow factor. These results are useful to determine when the mass-conserving JFO cavitation model or the simplified Reynolds cavitation model should be employed. Furthermore, the results are relevant to designing textured hard-on-soft bearings with application in, e.g., prosthetic hip implants.
Graphic Abstract
中文翻译：
在假体髋关节植入物的背景下，考虑不同空化模型的带纹理的硬对软轴承中润滑油膜厚度的软 EHL 模拟
我们使用软弹性流体动力润滑模拟来计算带纹理的硬对软平行滑块轴承中的润滑油膜厚度，并比较基于 Elrod 实施的 Jakobsson、Floberg 和 Olsson (JFO) 理论的质量守恒空化模型，以简化的雷诺和半索末菲空化模型。我们确定了在一系列轴承工作条件下使润滑油膜厚度最大化的最佳纹理设计参数，并将获得的结果与不同的空化模型进行比较。我们确定 JFO 空化模型预测的最佳织构纵横比比雷诺空化模型更小，并且使用不同空化模型计算的润滑油膜厚度之间的差异随着织构纵横比的增加和流动系数的降低而增加。这些结果有助于确定何时应采用质量守恒 JFO 空化模型或简化的雷诺空化模型。此外，该结果与设计用于例如假体髋关节植入物的带纹理的硬对软轴承相关。
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