A Comparison of Fractional Order Time Derivative Models of the Viscoelastic Stress Relations in Thermorheologically Complex Materials

Author

Victor B. Chambers

Date of Award

12-1991

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

Ronald L. Bagley, PhD

Abstract

The purpose of this thesis was to examine the viscoelastic behavior of thermorheologically complex materials, a typical example of which is a soft, rubbery material. Materials such as these are very useful in damping vibrations in structures, but the relaxation moduli of these materials change significantly with temperature and frequency. In the case of space structures applications where temperatures vary greatly and a stable platform is necessary, a method to predict this changing modulus is needed. The original approach was to validate a previously developed viscoelastic model, but the task expanded to include extending the model to materials with two transitions from a low modulus value to a higher value and applying thermodynamic principles to validate the extended model.

AFIT Designator

AFIT-GAE-ENY-91D-23

DTIC Accession Number

ADA243971

Comments

The author's Vita page is omitted.

Recommended Citation

Chambers, Victor B., "A Comparison of Fractional Order Time Derivative Models of the Viscoelastic Stress Relations in Thermorheologically Complex Materials" (1991). Theses and Dissertations. 7475.
https://scholar.afit.edu/etd/7475