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A simplified description of viscoelastic behavior of polymers as illustrated with biaxially‐oriented poly(ethylene terephthalate)
Author(s) -
Titomanlio G.,
Rizzo G.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760181006
Subject(s) - materials science , viscoelasticity , rheology , standard linear solid model , creep , stress relaxation , relaxation (psychology) , composite material , viscosity , poly ethylene , polymer , stress (linguistics) , ethylene , chemistry , linguistics , philosophy , catalysis , psychology , social psychology , biochemistry
Abstract A rheological model of solid polymers is proposed. Its mechanical analog is a parallel of a linear spring and a Maxwell element with variable viscosity. The viscosity of the dashpot is allowed to change with stress both directly, by an Eyring‐type mechanism, and through free volume changes according to the Doolittle equation. Predictions of the model reproduce many of the features shown, especially after yielding, by constant velocity stress‐strain, stress‐relaxation and creep data taken at room temperature on biaxially‐oriented poly(ethylene terephthalate) over a wide range of loading rates.