Auger D D, Dowson D, Fisher J, Jin Z M
Department of Mechanical Engineering, University of Leeds.
Proc Inst Mech Eng H. 1993;207(1):25-33. doi: 10.1243/PIME_PROC_1993_207_265_02.
Two hip joint prostheses were designed and constructed to be elastohydrodynamically equivalent producing approximately equal initial contact areas and theoretical film thicknesses. One was made from conventional UHMWPE (ultra-high molecular weight polyethylene) and the other was a cushion component which had a low modulus layer introduced into the joint space. Friction measurements were carried out on a pendulum simulator apparatus and the two joints were compared. In addition the experimental results were compared with theoretical values of friction predicted from elastohydrodynamic lubrication theory. Values for the friction factor at peak load and peak velocity in the cushion cup (0.003-0.009) were much lower than in the UHMWPE cup (0.017-0.042). The low friction values in the cushion cup are consistent with fluid film lubrication in the contact with the thin lubricating film being preserved by microelastohydrodynamic action.
设计并制造了两种髋关节假体，使其在弹性流体动力学方面等效，产生大致相等的初始接触面积和理论膜厚。一种由传统的超高分子量聚乙烯（UHMWPE）制成，另一种是在关节间隙中引入了低模量层的缓冲部件。在摆式模拟器装置上进行了摩擦测量，并对这两种关节进行了比较。此外，还将实验结果与根据弹性流体动力润滑理论预测的摩擦理论值进行了比较。缓冲杯在峰值载荷和峰值速度下的摩擦系数值（0.003 - 0.009）远低于超高分子量聚乙烯杯（0.017 - 0.042）。缓冲杯中的低摩擦值与接触中的流体膜润滑一致，薄润滑膜通过微弹性流体动力作用得以保留。
