Summary
Constitutive equations are derived for nonisothermal loading of glassy polymers at finite strains. The model is based on the theory of temporary networks in a version of the concept of adaptive links. The specific mechanical energy of a temporary network is determined with account for the potential energies of deformation for individual links and the energy of interaction between them. Stress-strain relations and a differential equation for the evolution of temperature are obtained using the laws of thermodynamics. As examples, we study uniaxial extension of a bar and simple shear of a layer. Explicit formulas are derived for the temperature drops prior to necking of specimens. Good agreement is demonstrated between experimental data for polycarbonate at room temperature and predictions of the model.
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Drozdov, A.D. The temperature drops in glassy polymers while strained. Acta Mechanica 139, 171–199 (2000). https://doi.org/10.1007/BF01170189
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DOI: https://doi.org/10.1007/BF01170189