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A thermodynamic theory on the nonlinear viscoelasticity of glassy polymers, 1. Constitutive equation
Author(s) -
Cho Kwang Soo,
Kim Sang Yong
Publication year - 2000
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/1521-3919(20000701)9:6<328::aid-mats328>3.0.co;2-5
Subject(s) - viscoelasticity , constitutive equation , polymer , disclination , nonlinear system , materials science , yield (engineering) , thermodynamics , statistical physics , physics , composite material , liquid crystal , optoelectronics , quantum mechanics , finite element method
We have developed a nonlinear viscoelastic constitutive equation, which can predict the yield behavior of polymers. This constitutive equation results from the viewpoints that the plastic flow of glassy polymers can be described by a soliton, which is expected to unify the existing concepts for viscoelasticity and yield of glassy polymers, such as dislocation, disclination and free volume. Although our approach is based on molecular concepts and irreversible thermodynamics, it is phenomenological.