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Constitutive equations in nonlinear viscoelasticity of glassy polymers based on the concept of traps
Author(s) -
Drozdov Aleksey D.
Publication year - 2000
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.11211
Subject(s) - viscoelasticity , materials science , constitutive equation , polymer , nonlinear system , amorphous solid , polyester , relaxation (psychology) , composite material , stress relaxation , thermodynamics , mechanics , creep , crystallography , physics , psychology , social psychology , chemistry , quantum mechanics , finite element method
Constitutive equations are derived for the nonlinear viscoelastic response of amorphous polymers. The model treats a glassy polymer as an ensemble of independent relaxing regions that randomly hop in their cages being thermally activated. Rearrangement occurs when a flow unit reaches some liquid‐like state. Stress‐strain relations are verified using experimental data in tensile relaxation tests for polyester resins with two types of flexibilizers. Fair agreement is demonstrated between observations and results of numerical simulation.