摘要
为研究振动载荷对腰椎间盘力学性能的影响,采用有限元方法,对人体腰椎间盘L3/L4节段在不同振动频率和振动幅值作用下的力学响应进行仿真分析,并与静载荷下的响应进行比较.发现:振动幅值相同时,振动都不同程度地增大了腰椎间盘的蠕变,振动频率越高,蠕变越大;振动幅值越大,振动频率对蠕变的影响越明显.椎间盘组织的Mises应力受振动频率的影响较小;孔隙压力随着振动频率的增加下降速度有所降低.应变增大时,应力松弛随频率的增加略有减小.因此长期处于振动载荷下,特别是频率较高时,更容易造成纤维环损伤.
In order to study the effect of vibration load on the mechanical properties of lumbar intervertebral disc,the mechanical responses of L3/L4 segment of human lumbar intervertebral disc under different vibration frequencies and amplitudes were simulated by finite element method. It was compared with the response under static load. The results showed that the vibration increased the creep strain of the lumbar intervertebral disc in different degrees at the same vibration amplitude. The higher the vibration frequency was,the greater the creep. The effect of vibration frequency on creep was more obvious with vibration amplitude increasing. The Mises stress of intervertebral disc tissue was slightly affected by vibration frequency. The decrease rate of pore pressure was reduced with the increase of vibration frequency. When the strain increased,stress relaxation decreased slightly with the increase of frequency. Therefore,long-term vibration load is more likely to damage the fiber ring,especially a high-frequency vibration.
作者
朱松峰
杨秀萍
栾义超
刘清
张春秋
ZHU Song-feng;YANG Xiu-ping;LUAN Yi-chao;LIU Qing;ZHANG Chun-qiu(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education（Tianjin University of Technology）,School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《天津理工大学学报》
2018年第5期56-60,共5页
Journal of Tianjin University of Technology
基金
国家自然科学重点基金(11432016)
国家自然科学基金(11672208
81272046)
关键词
腰椎间盘
力学性能
振动载荷
有限元法
intervertebral disc
mechanical property
vibration load
finite element method
