The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios R_s-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios R_s-l of “∞”-shape, but less affected by loads.

人工关节的复杂运动与假体材料的磨损机理密切相关，尤其是对运动路径敏感的聚合物假体。在本文中，选择“软-软”全聚合物 XLPE/PEEK 来研究运动路径对摩擦磨损性能的影响。本文基于摩擦系数和磨损形态的周期性特征，揭示了XLPE/peek在多方向运动路径下的摩擦磨损机理，获得了摩擦系数与“∞”形运动纵横比之间的定量关系。对揭示和分析“软”全聚合物在多方向运动路径下的磨损机理具有重要意义。结果表明，摩擦系数受运动路径的影响，具有周期性。而且，在多向运动路径下，PEEK的磨损主要是由于交叉剪切效应引起的磨粒磨损和粘着磨损，而XLPE的磨损主要是带有塑性堆积的磨粒磨损。此外，摩擦系数对纵横比R的影响很大“∞”形和载荷的_sl。同时，磨损形貌受“∞”形纵横比R _s-l影响较大，受载荷影响较小。