Ligament material behavior is nonlinear, viscoelastic and rate-independent under shear loading
Ligament material behavior is nonlinear, viscoelastic and rate-independent under shear loading
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DOI：
10.1016/s0021-9290(02)00041-6
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发表时间：
2002-07-01
影响因子：
2.4
通讯作者：
Bonifasi-Lista, C
中科院分区：
文献类型：
--
作者：
Weiss, JA;Gardiner, JC;Bonifasi-Lista, C
韧带的材料性能是由它的成分、它们的组织和它们之间的相互作用决定的。阐明韧带多轴材料行为的起源。我们研究了准静态和速率相关加载条件下韧带对剪切载荷的响应。应力松弛试验表明，该组织在剪切过程中具有高度粘弹性，在应力松弛的30分钟内，峰值载荷下降超过40%。应力松弛响应不受三十年剪切应变速率变化的影响。13和130%/s)。开发了一种新的参数估计技术来确定最能描述每个试件对剪切的实验响应的材料系数。采用基于有限元程序功能评估的非线性优化策略，对简单剪切试验中实验测量的夹钳位移和反作用力进行了分析。具有指数矩阵应变能的横向各向同性材料可以很好地拟合实验载荷-位移曲线，人体MCL的剪切模量随着剪切应变的增加而显着增加(p
The material behavior of ligament is determined by its constituents, their organization and their interaction with each other. To elucidate the origins of the multiaxial material behavior of ligaments. we investigated ligament response to shear loading under both quasi-static and rate-dependent loading conditions. Stress relaxation tests demonstrated that the tissue was highly viscoelastic in shear, with peak loads dropping over 40% during 30 min of stress relaxation. The stress relaxation response was unaffected by three decades of change in shear strain rate (1.3. 13 and 130%/s). A novel parameter estimation technique was developed to determine material coefficients that best described the experimental response of each test specimen to shear. The experimentally measured clamp displacements and reaction forces from the simple shear tests were used with a nonlinear optimization strategy based around function evaluations from a finite element program. A transversely, isotropic material with an exponential matrix strain energy provided an excellent fit to experimental load-displacement curves, The shear modulus of human MCL showed a significant increase with increasing shear strain (p