Contact analysis of ultrahigh molecular weight polyethylene articular plate in artificial knee joint during gait movement.
Contact analysis of ultrahigh molecular weight polyethylene articular plate in artificial knee joint during gait movement.
复制标题
人工膝关节中超高分子量聚乙烯关节板步态运动过程中的接触分析
DOI：
10.1115/1.2796020
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Yasuda
中科院分区：
文献类型：
--
作者：
H. Ishikawa;H. Fujiki;K. Yasuda
为了解人工膝关节用超高分子量聚乙烯（UHMWPE）关节板的磨损机理，采用循环塑性本构方程分析了步态运动时关节板的循环接触行为。本文采用二维平面应变模型，通过对两个部件的弹塑性压痕分析计算出的接触应力分布进行平移，模拟股骨和胫骨部件的接触行为。分析模型采用解剖型人工膝关节，研究了接触面形状对钢板磨损行为的影响。结果表明，摩擦副的磨损不仅发生在摩擦副的表面，也发生在摩擦副的亚表面，摩擦副的磨损行为与接触面的形状密切相关。利用该方法可以设计出最佳的接触面形状。
To understand the wear mechanism of the ultrahigh molecular weight polyethylene (UHMWPE) articular plate used in artificial knee joints, the cyclic contact behavior of the plate during gait movement was analyzed using the constitutive equation for cyclic plasticity. In this study, two-dimensional plane strain model was employed and the contact behavior of femoral and tibial components was simulated by translating the contact stress distribution which was calculated from elasto-plastic indentation analysis of two components. For analytical model, the anatomical type artificial knee joint was employed and the effect of the shape of contact surface on the wear behavior of the plate was investigated. As a result, it was clarified that the wear of the plate should occur both from the surface and the subsurface of the plate and the wear behavior of the plate should be closely related with the shape of contact surface. Then the optimum shape of contact surface could be designed using this method.