关节软骨的微摩擦接触力学特性  

Micro-frictional contact force properties of articular cartilage

作　　者：李锋[1] 王成焘[2] 

机构地区：[1]青岛科技大学机电工程学院,青岛266061 [2]上海交通大学机械与动力工程学院,上海200240

出　　处：《医用生物力学》2016年第2期124-128,共5页Journal of Medical Biomechanics

基　　金：国家重点基础研究发展计划(973计划)(2011CB706600);山东省博士后创新项目专项资金(201203029);青岛科技大学科研启动基金项目(0022642)

摘　　要：目的使用修饰后的原子力显微镜(atomic force microscopy,AFM)探针研究关节软骨的微摩擦接触力学性能。方法使用微操作器对AFM氮化硅探针进行修饰处理,具体操作为在探针上粘贴玻璃微球作为针尖,然后使用修饰后的探针研究人体和牛关节软骨的微摩擦接触力学性能。结果人体和牛软骨的粗糙度分别为(68.63±6.22)、(50.16±6.47)nm,随着载荷的增大,人体和牛软骨的摩擦力逐渐增大。当探针滑动速度从0增加到100μm/s时,试样与探针之间的摩擦力增速很快;当速度从100μm/s增加到300μm/s时,摩擦力上升缓慢。结论软骨表面具有明显的纤维状结构,软骨的粗糙度与测量范围直接相关。随着速度或载荷的增大,人体和牛软骨的摩擦力增大,变化范围相同。探讨关节软骨在微摩擦试验中的力学和摩擦学性能表现,对于认识软骨损伤机制和医用人工关节抗磨材料的开发具有重要意义。Objective To study the frictional contact force properties of articular cartilage by modified silicon probes of the atomic force micro-scopy（ AFM）. Methods Modification was conducted on the silicon nitride probes of AFM by micromanipulator,and the glass microsphere was glued on the probe by glass adhesive as the pinhead.Micro-tribology properties of human and bovine articular cartilage were then investigated by using the modified AFM probes. Results With the increase of load,the friction force on human and bovine cartilage also increased gradually. When the sliding speed increased from 0 to 100 μm / s,the friction force between the specimens and probes increased very quickly; when the sliding speed increased from 100 μm / s to 300 μm / s,the friction force increased but slowly. Conclusions Articular cartilage obviously has fibrous structure in its surface. The experiment shows a direct relationship existing between the surface roughness of articular cartilage and the measuring range.When the load or sliding speed increases,the friction forces in both human and bovine cartilage show an increase with the same variation range. The investigation on mechanical and tribological properties of articular cartilage in micro-frictional experiment will contribute to understanding the injury mechanism of articular cartilage and help to develop wear-resistant materials for medical artificial joints.

关 键 词：关节软骨 摩擦接触力 探针修饰 表面粗糙度 

分 类 号：TH117.1[机械工程—机械设计及理论] R318.01[医药卫生—生物医学工程]