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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Steady-state elastohydrodynamic lubrication analysis of a metal-on-metal hip implant employing a metallic cup with an ultra-high molecular weight polyethylene backing
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Steady-state elastohydrodynamic lubrication analysis of a metal-on-metal hip implant employing a metallic cup with an ultra-high molecular weight polyethylene backing

机译：带有超高分子量聚乙烯背衬的金属杯的金属对金属髋关节植入物的稳态弹性流体动力润滑分析

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摘要

The elastohydrodynamic lubrication (EHL) analysis was carried out in this study for a 28 mm diameter metal-on-metal hip prosthesis employing a metallic cup with an ultra-high molecular weight polyethylene (UHMWPE) backing under a simple steady state rotation representing the flexion/extension during walking. Both Reynolds and elasticity equations were coupled and solved numerically by the finite difference method. The elastic deformation was determined by means of the fast Fourier transform (FFT) technique using the displacement coefficients obtained from the finite element method. Excellent agreement of the predicted elastic deformation was obtained between the FFT technique and the conventional direct summation method. The number of grid points used in the lubrication analysis was found to be important in predicting accurate film thicknesses, particularly at low viscosities representative of physiological lubricants. The effect of the clearance between the femoral head and the acetabular cup on the predicted lubricant film thickness was shown to be significant, while the effect of load was found to be negligible. Overall, the UHMWPE backing was found not only to reduce the contact pressure as identified in a previous study by the authors (Liu et al, 2003) but also significantly to increase the lubricant film thickness for the 28mm diameter metal-on-metal hip implant, as compared with a metallic mono-block cup.
机译：本研究针对直径为28 mm的金属对金属髋关节假体进行了弹性流体动力润滑（EHL）分析，该假体使用具有超高分子量聚乙烯（UHMWPE）背衬的金属杯，在简单的稳态旋转下代表弯曲/步行时伸展。雷诺方程和弹性方程都通过有限差分法进行耦合和数值求解。弹性变形是通过快速傅立叶变换（FFT）技术使用从有限元方法获得的位移系数确定的。 FFT技术和常规直接求和方法之间获得了很好的预测弹性变形一致性。发现在润滑分析中使用的网格点数对于预测准确的膜厚非常重要，尤其是在代表生理润滑剂的低粘度情况下。股骨头和髋臼杯之间的间隙对预测的润滑膜厚度的影响被证明是显着的，而负荷的影响却可以忽略不计。总体而言，发现超高分子量聚乙烯衬底不仅降低了作者先前研究中确定的接触压力（Liu等，2003），而且还显着增加了直径为28mm的金属对金属髋关节植入物的润滑膜厚度，与金属整体杯相比。

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