人皮质骨径向微动损伤有限元分析与试验验证  

Finite Element Analysis and Experimental Validation of Human Femur Cortical Bone Radial Fretting

作　　者：刘娟[1] 沈火明[1] 蔡振兵[2] 朱旻昊[2] 

机构地区：[1]西南交通大学力学与工程学院,四川成都610031 [2]西南交通大学牵引动力国家重点实验室摩擦学研究所,四川成都610031

出　　处：《润滑与密封》2010年第9期13-17,共5页Lubrication Engineering

基　　金：国家重点基础研究发展计划项目(973计划)(2007CB714704);国家自然科学基金资助项目(50775192);中央高校基本科研业务费专项资金资助(44)

摘　　要：对骨哈佛氏系统径向微动进行有限元分析,分析结果显示:哈佛氏管、环骨板处和穿过环骨板和骨间质组织等多处有应力集中现象发生,高的应力梯度可导致哈佛氏骨管处、环骨处和骨间质组织等多处裂纹的萌生;高载荷条件下,穿过骨间质,联接相邻骨单位的较大塑性区也是裂纹萌生的原因。采用球-平面接触模式,在高精度液压伺服微动实验机上,对人股骨皮质骨的轴向断面的径向微动行为进行试验研究。用位移-载荷曲线对其动力学进行分析;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3种典型裂纹,即放射状裂纹、环状裂纹和联接裂纹。有限元分析和试验分析结果具有很好的一致性,试验结果充分验证有限元分析。Modeling and analysis were taken for Haversian system using FEM sott ware. Analytical results indicate that stress concentration which occurrs in the Haversian canal or around circumferential lamellas or cross the circumferential lamellas and the interstitial tissues could lead to mierocrack initiation of multi-areas. In addition, microcrack could occur in the result of a rather large plastic area which crosses interstitial bone and connected adjacent osteon under high load condition. Radial fretting behaviors of the fresh human axial femur compact bone were investigated under a fiat-on-ball configuration in high accuracy hydraulic servo fretting experimental machine. The kinetics behaviors of the compact bone were revealed by the force-displacement curves. The surface damage was analyzed combined with the examinations by laser confocal scanning microscopy （LCSM） and scanning electron microscopy （SEM） . The results show that three typical types of cracks-radial microcrack, annular microcrack and interstitial microcrack are observed. The test results and the FEM analysis results are of good consistency, and the experimental results adequately proof FEM analysis.

关 键 词：股骨密质骨 径向微动 裂纹 有限元分析 

分 类 号：TH117.1[机械工程—机械设计及理论]