Abstract
The influence of pre-orientation on the natural draw ratio achieved in necking has been studied for poly(ethylene terephthalate). The results are analysed with the aid of the non-Gaussian theory of rubber elasticity assuming that the amorphous phase behaves as a network formed by entanglements of chains. A model for separating the influence of amorphous and strain-induced crystalline regions on deformation is proposed and compared with the pseudo-affine model.
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