Title: Nonlinear viscoelastic relaxations in the glass transition region
Abstract: The manufacture and use of polymer parts typically involves deformations in the melt, solidification which may include the generation of thermal stresses, and finally the deformation of the resulting polymer solid. Numerous constitutive equations have been proposed for individually describing aspects of the melt flow, solidification, and solid mechanics of amorphous polymers; however, a unified constitutive equation is needed, since the nonlinear mechanical behavior of the solid often depends upon the deformation in the melt and the details of the thermal history during solidification. The current practice of patching together different constitutive descriptions for the melt, solidification, and solid behavior is particularly problematic, when trying to model manufacturing processes for precision parts with high dimensional stability requirements. We will report on a three-dimensional nonlinear viscoelastic constitutive equation for amorphous polymers that can potentially unify the nonlinear deformation behavior in the solid, vitrification from the melt, and the melt rheology.
Publication Year: 1995
Publication Date: 1995-12-31
Language: en
Type: article
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