Material constants for a finite element model of the intervertebral disk with a fiber composite annulus.
Material constants for a finite element model of the intervertebral disk with a fiber composite annulus.
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DOI：
10.1115/1.3138575
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发表时间：
1986-02
期刊：
影响因子：
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通讯作者：
R. Spilker;D. Jakobs;Albert B. Schultz
中科院分区：
文献类型：
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作者：
R. Spilker;D. Jakobs;Albert B. Schultz
建立了包含相邻两个椎体和中间椎间盘的人体脊柱节段的简单轴对称有限元模型。该模型包含四个亚结构：一个代表每个椎体，纤维环和髓核。在非轴对称荷载作用下，采用半解析技术保持二维分析的计算经济性。环形材料被表示为层状纤维增强复合材料。本文描述了表征环空各向异性层的材料常数的选择。结果表明，可以选择一组材料常数，从而使模型预测的圆盘在压缩、扭转、剪切和力矩载荷下的总行为与实验测量的圆盘行为的平均值和范围相一致。它还检查了不同的环形材料性能的影响。
A simple axisymmetric finite element model of a human spine segment containing two adjacent vertebrae and the intervening intervertebral disk was constructed. The model incorporated four substructures: one to represent each of the vertebral bodies, the annulus fibrosus, and the nucleus pulposus. A semi-analytic technique was used to maintain the computational economies of a two-dimensional analysis when nonaxisymmetric loads were imposed on the model. The annulus material was represented as a layered fiber-reinforced composite. This paper describes the selection of material constants to represent the anisotropic layers of the annulus. It shows that a single set of material constants can be chosen so that model predictions of gross disk behavior under compression, torsion, shear, and moment loading are in reasonable agreement with the mean and range of experimentally measured disk behaviors. It also examines the effects of varying annular material properties.