【摘要】 采用高精密微动试验台外加体液恒温循环装置,在一定法向载荷和不同位移幅值条件下,研究了天然活性人股骨皮质骨对纯钛的微动摩擦磨损行为。试验结果显示:随位移幅值的增加,股骨皮质骨的微动运行状态从部分滑移向完全滑移状态转变,详细讨论了不同位移幅值下摩擦因数随循环次数的演变规律。微观观察表明:接触表面处于部分滑移状态时损伤轻微,而在完全滑移状态下磨损较严重。人股骨皮质骨的磨损机理主要表现为磨粒磨损和微骨折导致的剥层剥落。微动磨痕的深度随位移幅值的增加而增加,而且磨痕深度与摩擦因数有很好的对应关系。研究认为控制植入体/骨界面的微动幅度有利于提高皮质骨抗微动损伤的能力。更多还原

【Abstract】 Under tangential fretting and imitating human physiological solution conditions, the fretting behaviors of axial cortical bone from fresh human femur are investigated by sliding against pure titanium ball counterpart. The friction logs and friction coefficients of cortical bone are calculated. The fretted surfaces of the cortical bone are analyzed by means of laser confocal scanning microscopy. The results show that the friction logs for cortical bone change with cycles from elastic partial slip, plastoelastic partial slip to gross sliding respectively. And the evolution of friction coefficients in each fretting condition is also compared statistically. The fretting damage in the elastic partial slip is slight. But the abrasive wear and micro-fracture are observed in the plastoelastic partial slip and gross sliding regions. The wear depth increase with cycles and well related to the friction coefficient of cortical bone in each fretting condition. To reduce the fretting damages of bone, it is advisable to control the displacement amplitude at bone-implant interface.更多还原