Title page for ETD etd-09162009-040212

Type of Document Dissertation
Author Griffith, William I.
URN etd-09162009-040212
Title The accelerated characterization of viscoelastic composite materials
Degree PhD
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Brinson, Halbert F. Committee Chair
Henneke, Edmund G. II Committee Member
Holzer, Siegfried M. Committee Member
Meirovitch, Leonard Committee Member
Smith, Charles W. Committee Member
  • Composite materials
Date of Defense 1980-04-05
Availability restricted

A brief review of necessary fundamentals relative to composite materials and viscoelasticity is provided. Subsequently the accelerated characterization techniques of Time Temperature Superposition and Time Temperature Stress Superposition are treated in detail. An experimental procedure for applying the latter to composites is given along with results obtained on a particular T300/934 graphite/epoxy. The accelerated characterization predictions are found in good agreement with actual long term tests. A postcuring phenomenon is discussed that necessitates thermal conditioning of the specimen prior to testing. A closely related phenomenon of physical aging is described. The effect of each on the glass transition temperature and strength is discussed.

Creep rupture results are provided for a variety of geometries and temperatures for T300/934 graphite/epoxy. The results are found to compare reasonably with a modified kinetic rate theory.

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