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Thermodynamics of dissipative materials with entropic elasticity
Author(s) -
Astarita Gianni
Publication year - 1974
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.760141012
Subject(s) - viscoelasticity , dissipative system , thermodynamics , elasticity (physics) , materials science , second law of thermodynamics , entropy (arrow of time) , constitutive equation , thermoelastic damping , non equilibrium thermodynamics , thermodynamic free energy , mechanics , classical mechanics , physics , thermal , finite element method
Polymer solutions and melts can both dissipate mechanical energy in flow, as well as accumulate elastic energy. If the assumption is made that elastic energy can be accumulated only through a decrease of conformational entropy, the general thermodynamic theory for non‐linear viscoelastic materials simplifies considerably. In particular, though no generality is lost as far as the constitutive equation for stress is concerned, the energy equation, which allows in principle a calculation of temperature distributions arising from frictional heating and heat removal, reduces to the usual form which is valid for viscous materials.