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The Physics of Deformation and Fracture of Polymers by Ali Argon

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4 Small-strain elastic response

4.1 Overview

At temperatures sufficiently below the glass transition and under stresses well below the plastic yield stress to be defined later, all polymers exhibit reversible elastic behavior, which is quite often anisotropic, particularly when it relates to a polymer product that has undergone substantial prior deformation processing.

We differentiate between two limiting forms of elastic response in polymers. In all cases, applied stresses produce an increase in free energy in the polymer. In the low-temperature realm, well below the glass-transition temperature, the change in free energy will be stored, overwhelmingly, as internal energy, whereas at temperatures close to and above the glass transition ...

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