Keywords
Intervertebral Disc, Postmortem Interval, Stress Relaxation, Spine, Schapery Collocation
Abstract
Currently, forensic scientists are only able to determine time since death (or postmortem interval) up to the first 60 hours. This is based largely on insect activity. Herein, it is proposed to use the degradation of the intervertebral disc (IVD) after death to determine a relationship between the mechanical properties of cadaveric tissue and time since death in order to extend the 60-hour window. To that end, 1 fresh human spine and 6 pig spines were each separated into sections (6 human and 48 pig), with each section having one intact disc. The sections were buried, unearthed, and cleaned, leaving only the disc and bone. To determine the mechanical properties, each disc underwent three different tests: cyclic conditioning, compression, and stress relaxation testing. The Schapery collocation method was used to create a theoretical curve from the data for the experimental curve. Observations were made involving the corresponding k values of the curve. Although there are trends in the data for k values that approximate the experimental stress relaxation curve, a correlation could not be determined.
Notes
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Graduation Date
2005
Semester
Summer
Advisor
Conway, Ted
Degree
Master of Science in Mechanical Engineering (M.S.M.E.)
College
College of Engineering and Computer Science
Department
Mechanical, Materials, and Aerospace Engineering
Degree Program
Mechanical Engineering
Format
application/pdf
Identifier
CFE0000666
URL
http://purl.fcla.edu/fcla/etd/CFE0000666
Language
English
Release Date
August 2005
Length of Campus-only Access
None
Access Status
Masters Thesis (Open Access)
STARS Citation
Jackson, Jennifer Noelle, "Mechanical Properties Of The Intervertebral Disc As An Estimator Of Postmortem Interval" (2005). Electronic Theses and Dissertations. 452.
https://stars.library.ucf.edu/etd/452