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

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.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1991
Accession Number
ADA243971

Entities

People

  • Victor B. Chambers

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Arrhenius Equation
  • Classification
  • Curve Fitting
  • Engineering
  • Equations
  • Frequency
  • High Temperature
  • Law
  • Materials
  • Materials Science
  • Modulus Of Elasticity
  • Probability
  • Shear Modulus
  • Standards
  • Stress Strain Relations
  • Stresses
  • Transfer Functions

Readers

  • Calculus or Mathematical Analysis
  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design

Technology Areas

  • Space