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-  2016 

关节软骨的微摩擦接触力学特性

DOI: 10.3871/j.1004-7220.2016.02.124

Keywords: 关节软骨,摩擦接触力,探针修饰,粗糙度
Articular
,cartilage,Frictional,contact,force,Probe,modification,Surface,roughness

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Abstract:

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100 μm/s时,试样与探针之间的摩擦力增速很快;当速度从100 μm/s增加到300 μm/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 microscopy (AFM). Methods Modification was conducted on the silicon nitride probes of AFM by the 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 of human and bovine cartilage also increased gradually. When the sliding speed increased from 0 to 100 /s, the friction force between specimens and probes increased quickly; when the sliding speed increased from 100 /s to 300 /s, the friction force increased slowly. Conclusions Articular cartilage had an obvious fibrous structure in its surface. There was a direct relationship between the surface roughness of articular cartilage and the measuring range. When the load or sliding speed increased, the friction forces of 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 developing wear-resistant materials for medical artificial joints.

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