牛膝关节软骨的摩擦行为研究

采用UMT．2型微观多功能测试系统，在试验环境为牛血清，法向加载应力0．8MPa，加载时间从5s到60min变化条件下分别测定了牛膝关节软骨在静态加载和滑行时的法向位移以及滑行时的摩擦系数．结果表明：上、下软骨间的法向位移与加载时间呈非线性增加；滑行时法向位移影响软骨间摩擦系数，启动摩擦系数高于平坦滑行过程中的摩擦系数；滑行速率对软骨摩擦系数的影响较小，加载时间越长，法向位移越大，所对应的启动摩擦系数越大；加载时法向位移和滑行时启动摩擦系数具有类似的变化趋势．

Research on Friction Behavior om Bovine Knee Articular Cartilage

Normal displacement of articular cartilage was measured under static load and in sliding, and friction coefficient was measured in sliding using UMT-2 Multi-Specimen Test System. Lubricant was bovine serum, normal loading stress was 0.8 MPa, and loading duration for tests lasted from 30 s to 60 min. Normal displacement between the bovine cartilages increased nonlinearly with loading time. Normal displacement in sliding influenced friction coefficient between bovine cartilages process, and sliding speeds played a less , friction coefficient at start-up was much higher than that in smooth sliding role on friction coefficient. The longer the loading time, the more the normal displacement, and the more the friction coefficient at start-up. Variation trends of friction coefficient at start-up to loading time was similar to that for normal displacement.