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Thermodynamic theory of the viscoelasticity and yield of glassy polymers: Internal time theory
Author(s) -
Cho Kwang Soo,
Kim Sang Yong
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12364
Subject(s) - viscoelasticity , thermodynamics , yield (engineering) , constitutive equation , entropy production , materials science , polymer , entropy (arrow of time) , nonlinear system , physics , composite material , quantum mechanics , finite element method
A nonlinear viscoelastic constitutive equation of glassy polymers has been developed on the basis of the internal time and irreversible thermodynamics of internal variables. The constitutive equation is a generalization of spring–dashpot models and describes the yield behavior of glassy polymers. With this constitutive equation, the rate of entropy production has been determined to show a peak near the yield. We propose a new yield criterion, that yield occurs at the maximum rate of entropy production. The yield criterion is almost equivalent to that of peak stress and a thermodynamic interpretation of yield. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2400–2411, 2003