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Study of aspherical femoral head aiming long-life artificial hip joint

非球面股骨头瞄准长寿命人工髋关节的研究

基本信息

批准号：
16560124
负责人：
IMADO Keiji
金额：
$ 2.05万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560124/
关键词：
Artificial joint Contact pressure Slide Track Conformal contact Euler Angles Angular Velocity Euler Angles FEM coefficient of friction Machining Direction contact temperature

项目摘要

To improve lubricating condition in artificial joint, it is necessary to know the magnitude of contact stress. In this study, some parametric equations were derived to calculate contact pressure in conformal contacts. The results obtained from the equations were confirmed to agree with that of FEM calculation.Influence of contact pressure distribution on the coefficient of friction was investigated for some polymeric bearings in dry and lubricated conditions. Reciprocal pin on plate sliding test and Soda pendulum type sliding tests were carried out. It was found that the contact pressure distribution has a significant effect on the coefficient of friction in lubricated condition. The coefficient of friction became smaller when the pin was sliding with the lower contact pressure side ahead. The coefficient of friction in dry conditim does not depend on sliding direction regardless of contact pressure distribution.The effect of an orientation of grinding direction of the surface to sliding direction on the coefficient of friction was also studied by using a reciprocal sliding tester. It was found that the coefficient of friction became smallest in the case of sliding direction perpendicular to the grinding direction. Conversely, it became largest in the case of sliding direction parallel to the grinding direction. Furthermore a method of slide track calculation was studied by introducing angular velocity in a fixed coordinate system and a moving coordinate system as well.

为了改善人工关节的润滑状况，有必要了解接触应力的大小。在这项研究中，推导了一些参数方程来计算共形接触中的接触压力。计算结果与有限元计算结果吻合较好。研究了聚合物轴承在干摩擦和润滑状态下接触压力分布对摩擦系数的影响。进行了往复销板滑动试验和Soda摆杆式滑动试验。结果表明，在润滑条件下，接触压力分布对摩擦系数有显著影响。摩擦系数随着销轴接触压力较低一侧的向前滑动而减小。在干摩擦条件下，无论接触压力分布如何，摩擦系数都不依赖于滑动方向，并利用往复滑动试验机研究了表面磨削方向与滑动方向的取向对摩擦系数的影响。结果表明，当滑动方向垂直于磨削方向时，摩擦系数最小。相反，在滑动方向平行于磨削方向的情况下，它变得最大。在此基础上，研究了在固定坐标系和运动坐标系下引入角速度的滑动轨迹计算方法。