Material Constants for a Finite Element Model of the Intervertebral Disk With a Fiber Composite Annulus

[+] Author and Article Information
R. L. Spilker

Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, N.Y. 12180

D. M. Jakobs

Danley Machine Company, Chicago, Ill. 60612

A. B. Schultz

Department of Mechanical Engineering and Engineering Mechanics, University of Michigan, Ann Arbor, Mich. 48109

J Biomech Eng 108(1), 1-11 (Feb 01, 1986) (11 pages) doi:10.1115/1.3138575 History: Received June 01, 1983; Revised August 21, 1985; Online June 12, 2009


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.

Copyright © 1986 by ASME
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