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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part J. Journal of engineering tribology >Finite element analysis of elastohydrodynamic lubrication in an artificial hip joint under squeeze film motion using fluid-structure interaction method
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Finite element analysis of elastohydrodynamic lubrication in an artificial hip joint under squeeze film motion using fluid-structure interaction method

机译：用流体 - 结构相互作用法在挤压膜运动下挤压膜运动中弹性流体动力学润滑的有限元分析

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摘要

Classical approach for elastohydrodynamic lubrication problems contains solution of Reynolds and elasticity equations simultaneously, where elasticity equation was derived based on semi-infinite solid assumption. Fluid-structure interaction method which uses finite element formulation is another alternative approach for elastohydrodynamic lubrication problems. Present study contains two sections: first finite element method was used to evaluate accuracy of semi-infinite assumption for deformation in an artificial joint cup for a verity of material and geometrical properties. Then fluid-structure interaction method was used to simulate an artificial hip joint lubrication under squeeze film motion and efficiency and accuracy of this method was speculated by comparing the results to a previously done work. In the first section, deformation of a cup under Hertzian contact was calculated by finite element software ADINA. Various combinations of cup thickness, material properties, and dimensions of contact ellipse were modeled and results compared to the answer of semi-infinite assumption and column method for the same problem. Then a ball-in socket configuration for an artificial hip joint was modeled by an ultra-high-molecular-weight polyethylene cup and a Stainless Steel ball in the same software. Fluid film pressure and thickness were extracted from the results and compared to a previous study. Results for deformation of cup show that semi-infinite assumption and column method do not lead to acceptable accuracy for geometrical conditions of artificial hip joint. For fluid-structure interaction analysis of squeeze film motion, at first time steps, pressure distribution shows differences with the previous work, but at last time steps, fluid film pressure matches the previous study. For all time steps, film thickness of fluid-structure interaction method is higher than what was reported by previous work. The main reason is that no mesh independency check was performed for previous work, while for this study mesh independency of answers was analyzed by creating two other models.
机译：弹性流体动力学润滑问题的经典方法含有雷诺和弹性方程的溶液同时，其中基于半无限实心假设来得出弹性方程。使用有限元制剂的流体结构相互作用方法是弹性流体动力学润滑问题的另一种替代方法。目前的研究含有两个部分：第一种有限元方法用于评估半无限假设的精度，以便在人工关节杯中变形，以实现材料和几何特性的结构。然后使用流体结构相互作用方法来模拟挤出膜的人工髋关节润滑，并通过将结果与先前完成的工作进行比较来推测该方法的效率和准确性。在第一部分中，通过有限元软件Adina计算了赫兹联系人下的杯子的变形。与相同问题的半无限假设和柱法的答案相比，建模杯厚度，材料特性和尺寸的各种组合，结果和结果相比。然后，用于人工髋关节的球形插座构造由同一软件中的超高分子量聚乙烯杯和不锈钢球进行建模。从结果中提取流体膜压力和厚度并与先前的研究相比。杯子变形的结果表明，半无限的假设和柱法不会导致人造髋关节的几何条件可接受的准确性。对于挤压薄膜运动的流体结构相互作用分析，在第一次步骤中，压力分布显示与先前的工作差异，但最后一次步骤，流体膜压力与先前的研究相匹配。对于所有时间步骤，流体结构相互作用方法的薄膜厚度高于以前的工作报告的薄膜厚度。主要原因是没有对以前的工作执行网格独立性检查，而通过创建另外两个模型，对此研究答案的网格独立性。

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