加载速率对关节软骨变形特性影响的研究  

INVESTIGATION ON ARTICULAR CARTILAGE DEFORMATION PROPERTIES AFFECTED BY LOADING RATES

作　　者：钱善华 刘利国 倪自丰 葛世荣[2] 靳忠民[3,4] 

机构地区：[1]江南大学机械工程学院,无锡214122 [2]中国矿业大学机电工程学院,徐州221116 [3]西安交通大学机械工程学院,西安710049 [4]利兹大学机械工程学院

出　　处：《工程力学》2013年第12期298-304,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50535050;51205168);摩擦学国家重点实验室开放基金项目(SKLTKF12B09)

摘　　要：通过对不同加载速率下关节软骨变形特性的研究,探讨关节软骨在异常应力下的损伤机制。在UMT-2多功能试验机上开展三种加载速率下关节软骨的压缩试验,并建立相应的有限元模型。在线性加载下,关节软骨的弹性模量随应变经历了先急剧下降后缓慢增加的变化;有限元模拟的应变与试验测定的应变的偏差低于0.025;当加载速率为0.01MPa/s和0.0067MPa/s时,软骨弹性模量和孔隙压力的差异较小,但与加载速率0.02MPa/s对应的弹性模量和孔隙压力的差异较为显著。加载速率对软骨变形和孔隙压力有着显著影响,但当加载速率低于某一值时,软骨变形对加载速率的依赖性降低,其研究结果有助于深入理解在异常应力速率下关节软骨的损伤机制。By means of the investigation on the articular cartilage deformation properties affected by the different loading rates, the injury mechanism of the natural cartilage by the abnormal stress is discussed. The compression experiment on the cartilage deformation at three loading rates was carried out on the UMT-2 multi-functional testing rig, and the corresponding finite element model was established. The results show that the elastic modulus undergoes initially a sharp decline and then a slow incline with the increase strain. The strain measured from the experiment is within 0.025 of the finite element precision. As the loading rates are 0.01MPa/s and 0.0067MPa/s, the differences of the pore pressure carried by the cartilage matrix and the elastic modulus are negligible. But as for the loading rate of 0.02MPa/s, the corresponding pore pressure and elastic modulus are markedly different. Loading rate plays a significant role on the cartilage deformation and pore pressure, but while the loading rate is below a certain value, the dependence of the cartilage deformation on the loading rate is reduced, indicating that these results could be helpful to deeply understand the injury mechanism of a cartilage matrix by the abnormal stress rate.

关 键 词：线性加载 单向压缩 有限元 弹性模量 液体承载 异常应力 

分 类 号：R318.1[医药卫生—生物医学工程]