Constitutive equations in nonlinear viscoelasticity of glassy polymers based on the concept of traps
DOI: 10.1002/PEN.11211
关键词: Constitutive equation 、 Composite material 、 Amorphous solid 、 Viscoelasticity 、 Polyester 、 Relaxation (physics) 、 Nonlinear system 、 Computer simulation 、 Polymer 、 Materials science
摘要: Constitutive equations are derived for the nonlinear viscoelastic response of amorphous polymers. The model treats a glassy polymer as an ensemble independent relaxing regions that randomly hop in their cages being thermally activated. Rearrangement occurs when flow unit reaches some liquid-like state. Stress-strain relations verified using experimental data tensile relaxation tests polyester resins with two types flexibilizers. Fair agreement is demonstrated between observations and results numerical simulation.
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