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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.
Key
words: Fretting wear Femur Cortical bone Implant
CLC No: TQ174
国家自然科学基金(50275126,
50305030)、中国博士后科学基金(2003033526)和四川省重点科技攻关(03SG022)资助项目. Received 20040913,
received in revised form 20050301
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