216 Nonlinear Viscoelastic Deformation Modelling for Glassy Engineering Polymers

概要

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A new 3-D physically based constitutive model, capable of capturing the response of isotropic glassy polymers more faithfully than has been possible hitherto, was developed. It is based on an existing constitutive model proposed by Dooling, Buckley and Hinduja, but extends it to encompass the well-known deformation-induced structural evolution characteristic of glasses. The new model has been shown to correctly describe the material deformation behaviour in the nonlinear viscoelastic regime, under a variety of loading histories and different modes of deformation, including the enhanced recovery after removal of load, and stress drop after yield, with the same set of parameters. Furthermore, the model produces the right effect of varying stress invariants, a feature which has not been shown before by any other constitutive model for glassy polymers. The paper outlines the model, and illustrates how it may be applied and fitted to experimental data, by reference to the case of glassy poly (methyl methacrylate) (PMMA) in the region well below its glass transition.
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