Mechanical Properties of the Spinal Ligaments of Primates. 1. Cyclic Loading. 2. Mathematical Modeling.
Abstract
This report is composed of two parts covering the response of spinal ligaments to cyclic creep and a mathematical model of those ligaments to a specified strain history. Four ligaments of the spine of rhesus monkey and baboon were selected for testing with test samples taken at different vertebral levels. The cyclic creep tests on ligaments from three rhesus monkeys and two baboons were preceded by single extension failure tests on ligaments from two rhesus monkeys to establish a range of static failure. In Part 2, a mathematical constitutive equation was developed using a linear viscoelastic model for individual fibers and a distribution function to include the effects of fiber distribution, orientation and initial length. Material constants and the distribution function were determined by numerical solution of the constitutive integral equation using the fastest strain rate data. Analytical and experimental results were compared for selected human spinal ligament samples. This research completes an initial investigation of the mechanical properties of spinal ligaments from the lower extremities. Research of this nature is necessary to understand the mechanism of injuries in aircrewmen that result from exposure to vibratory loading environments and high stress or strain rates during escape and crash episodes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1983
- Accession Number
- ADA125540
Entities
People
- Arnold R. Slonim
- Robert P. Hubbard
- Robert Wm. Little
Organizations
- Michigan State University