Volume changes in glassy polymers
作者： A. D. Drozdov
关键词: Modulus 、 Polymer 、 Stress relaxation 、 Viscoelasticity 、 Composite material 、 Constitutive equation 、 Poisson's ratio 、 Compressibility 、 Volume (thermodynamics) 、 Materials science
摘要: Constitutive equations are derived for compressible glassy polymers at non-isothermal loading with finite strains. The model is based on the theory of temporary networks in its version adaptive links concept. stress–strain relations applied to analysis uniaxial extension a viscoelastic bar. Explicit formulas developed time-dependent Young's modulus and Poisson's ratio bar small Results numerical simulation compared experimental data polycarbonate, polyethylene, poly(methyl methacrylate). It demonstrated that (i) longitudinal stresses do not affect specific free volume region linear viscoelasticity strains up about 0.2%, cause substantial changes nonlinear 1.0%; (ii) latter case, increment free-volume fraction proportional increase volume.
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