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The accelerated characterization of viscoelastic composite materials
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
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.