Non-linear viscoelastic behavior of some polymers and their composites.

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Author
Hering, Frederic Shriver
Date
1968Advisor
Kinney, G.F.
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Show full item recordAbstract
Constant load creep data were obtained for four plastics: polyethyline,
polypropylene, nylon, and polycarbonate. Viscoelastic responses of
these materials proved to be non-linear in both time and stress. An
empirical creep equation, based on a time dependent retardation rate
constant, was developed to characterize the creep behavior and good correlation
was obtained for various stress levels. By assuming the developed
relationship to be an equation of state, creep behavior of simple
composites of plastics was predicted with good results when viscoelastic
responses of the components were similar. The importance of stress-time
history is demonstrated by using the creep equation to estimate mechanical
behavior in other modes of testing. The concept of a retardation spectrum
and its application to the materials studied is considered.
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