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首页> 外文期刊>Journal of Biomechanics >Transient elastohydrodynamic lubrication analysis of metal-on-metal hip implant under simulated walking conditions.
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Transient elastohydrodynamic lubrication analysis of metal-on-metal hip implant under simulated walking conditions.

机译：模拟行走条件下金属对金属髋关节植入物的瞬态弹性流体动力润滑分析。

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摘要

The transient elastohydrodynamic lubrication (EHL) analysis was performed in this study for a typical metal-on-metal bearing employing a polyethylene backing underneath a metallic cup inlay under dynamic operating conditions of load and speed representative of normal walking. A ball-in-socket configuration was adopted to represent the articulation between the femoral head and the acetabular cup. The governing Reynolds and elasticity equations were solved simultaneously by using both finite difference and finite element methods. The predicted transient film thickness from the present study was compared with the estimation based on the quasi-static analysis. It was found that the polyethylene backing employed in the typical metal-on-metal hip bearing, combined with dynamic squeeze-film action, significantly improved the transient lubricant film thickness under cyclic walking and consequently a fluid film lubrication regime was possible for smooth bearing surfaces with an average roughness less than 0.005microm.
机译：在这项研究中，对典型的金属对金属轴承进行了瞬态弹性流体动力润滑（EHL）分析，该轴承是在动态载荷和速度（代表正常行走）的动态工作条件下，在金属杯嵌体下方使用聚乙烯作为支撑的。采用球窝结构来代表股骨头和髋臼杯之间的关节。同时使用有限差分法和有限元法同时求解了控制雷诺数和弹性方程。本研究的预测瞬态膜厚度与基于准静态分析的估计值进行了比较。结果发现，典型的金属对金属髋关节轴承中使用的聚乙烯背衬结合动态挤压膜作用，可以显着改善循环行走过程中的瞬态润滑剂膜厚度，因此，对于光滑的轴承表面，可以采用流体膜润滑方式平均粗糙度小于0.005微米。

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