聚乙烯人工髋臼的摩擦学性能研究

TRIBOLOGICAL PROPERTY STUDY OF POLYETHYLENE ACETABULUM

本文对聚乙稀—钛合金人工关节进行了摩擦学性能研究,制作了不同分子量和结晶形态的超高分子量聚乙烯试样,测定了它们的机械物理性能。运用弹性流体动力润滑理论,分析了不同分子量(?)白构成润滑膜的能力,制作了'环—环'摩擦副试样,在磨损试验机上进行了'磨损量-时间'关系测定,并观察了三维表面形貌。结果表明:在经历跑合过程后,聚乙烯试样的磨损量均匀增长,而钛合金试样磨损量呈现周期性的波动,但摩擦系数始终保持一平稳数值。

In this. paper, the tribological properties of artificial hip joint with polyethylene acetabulum and titanium alloy femoral head are studied. Several ultra high molecular weight polyethylene samples with different molecular weight, molecular structure and morphology are used. The mechanical-physical properties of these samples are measured. According to the measured value of different elastic modulus, using the theory of elastic hydrodynamic lubrication, the capacity forming lubricant film of eacetabulums with different molecular weight is analyzed. Applying the 'ring-ring' friction set test pieces, the rela tionship between wear quantity and time is determined on the wear test machine, and the change of the three-dimensional shaps of friction surface is also measured. The results indicate that the wear quantity of the polyethylene sample is increased homologically after running in, while the wear quantity of titanium alloy fluctuates cyclically, and its coefficient of friction keeps stable from beginning to end.