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.