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将关节接触简化为两弹性椭球体的接触,应用弹性流体动力润滑(Elasto-Hydrodynamic Lubrication-EHL)理论研究人类天然关节和人工关节的润滑状态.给出适用于静载、富油、低弹性模量材料的最小膜厚公式H_(min)=2.12(1-0.984e~(-0.579k)U~(0.579)W~(-0.224).由于关节实际上承受变载荷,挤压膜对关节的润滑有重要作用,为此本文进而提出称谓“动载弹性流体动力润滑”的关节润滑模型.应用这个模型,研究了人在行走时髋关节的润滑情况.研究结果表明,在一个行走周期内,髋关节的表面约三分之一时间处于弹性流体动力(Elasto-Hydrodynamic—EHD)润滑;三分之一时间处于混合润滑;其余时间处于边界润滑.这就是说,润滑状态是随时间而变化的.
Elasto-Hydrodynamic Lubrication-EHL (EHL) theory is used to study the lubrication status of human natural joints and artificial joints.According to the theory of Elasto-Hydrodynamic Lubrication-EHL (EHL) The minimum thickness of the material H_min = 2.12 (1-0.984e ~ (-0.579k) U ~ (0.579) W ~ (-0.224) .Because the joint is actually subjected to variable load, the squeeze film on the joint lubrication This article put forward the joint lubrication model named “Dynamic Elastohydrodynamic Lubrication” .This model is used to study the lubrication of the hip joint when walking.The results show that in a walking cycle , The surface of the hip joint is elastically hydraulically lubricated (Elasto-Hydrodynamic-EHD) for about a third of the time; hybrid lubrication is performed for one-third of the time; and the boundary lubricates for the rest of the time. That is, the state of lubrication changes over time of.