超高分子量聚乙烯材料的边界润滑特性研究  

Behaviours of Boundary Lubrication on Ultra-high Molecular Weight Polyethylene

作　　者：王步康[1] 董光能[2] 张金换[1] 黄世霖[1] 谢友柏[2] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]西安交通大学润滑理论及轴承研究所,陕西西安710049

出　　处：《润滑与密封》2005年第4期4-5,共2页Lubrication Engineering

基　　金：国家自然科学基金资助项目(50175088).

摘　　要：在研究人工关节材料超高分子量聚乙烯(UltrahighMolecularWeightPolyethylene,UHMWPE)磨损机理时,考虑了表面载荷引起的变形和应力状态,运用有限元技术,采用液-力耦合方法,分析了组织液对裂纹扩展的影响以及骨移植后接触磨损机理。结果表明:裂纹顶部区域符合线弹性断裂机理,这有助于更好地了解骨移植后接触区的磨损机理。In investigating the wear mechanisms of ultra-high molecular weight polyethylene (UHMWPE) for joint, the effects of surface crack were considered in the calculation of the local deformation and stress state. The stress distribution around the crack was analyzed and the influence of lubricant to the crack was studied by the coupling fluid-structure analysis using finite element method (FEM) approach. Results show that the zone around the crack front conforms to linear elastic fracture mechanics (LEFM), and it is helped to understand better the wear mechanisms of hip prosthesis contact.

关 键 词：边界润滑 超高分子量聚乙烯(UHMWPE) 液-力耦合 

分 类 号：TH117.2[机械工程—机械设计及理论]