人皮质骨的体外径向微动行为及其有限元分析研究  

Research on radial fretting behavior of human femur cortical bone in vitro

作　　者：蔡振兵[1] 高姗姍[2] 于海洋[2] 朱旻昊[1] 

机构地区：[1]西南交通大学材料先进技术教育部重点实睑室摩擦学研究所。四川成都610031 [2]四川大学华西口腔医学院,四川成都610041

出　　处：《Journal of Life Sciences》2008年第4期8-11,17,共5页生命科学（英文版）

基　　金：本文得到国家自然科学基金（项目编号：30572064）、教育部新世纪优秀人才计划（项目编号：NCE7-04-0885）和重点科技项目（项目编号：106137）资助.

摘　　要：在高精度液压伺服微动试验机上，用水平面接触方式，采取体外试验方法，对人股骨皮质骨的轴向断面的径向微动行为进行了研究。用F-D曲线对其动力学追行了分析；采用LCSM、SEM等方法对磨痕进行观测分析。结果表明：径向微动条件下，在股骨密质骨中可观察到三种典型裂纹，即放射形裂纹、环状裂纹和贯通裂纹。在试验载荷为100N-300N时，表面产生微裂纹和组织体剥落是皮质骨径向微动的主要损伤机制。用ANSYs9．0软件封骨哈佛氏系统进行了建模，分析结果显示，呈同心圆排布的哈佛氏管处发生应力集中；间骨板的应力大于环骨板的应力；环骨板外层的应力逐级大于内层的应力。研究显示．骨单位比骨间暂组织有更强的抗径向微动损伤性能．In this study, the fretting behaviors of the femur cortical bone were investigated under a flat-on-ball configuration in vitro at a high precision hydraulic pressure servo fretting test system. Testes of radial fretting have been carried out under the varied imposed normal loads. The kinetics behaviors of the cortical bone under two fretting conditions combined with the examinations by Laser Confocal Scanning Microscopy （LCSM）, Scanning Electron Microscopy （SEM） were analyzed in detail. The worn morphologies of radial fretting indicated that micro-cracks and particle detachment occurred primarily at the edge of contact zone. Three types crack configurations were observed, the damage mechanisms of human femur cortical bone under radial fretting conditions which presented the delamination and cracking were outlined. The Haversian system was simulated and analyzed by ANSYS 9.0 software. The FEM result showed that stress concentration occurred around the canal. It was found that Haversian system played an important role in the two fretting damage models of compact bone. Circumferential lamella had a better feature of resistance to fretting damage than interstitial lamella.

关 键 词：微动损伤 径向微动 股骨皮质骨 裂纹 有限元分析 

分 类 号：Q8[生物学]