| Résumé : |
Polymer processing involves both continuous (e.g., extrusion) and batch (e.g., injection molding) operations and is the main occupation of the plastics industries. The difficulty in describing adequately the rheology of these materials is their viscoelastic character, which requires sophisticated constitutive equations. To do this, different models have been proposed either of differential or integral or molecular type. The most popular these days appear to be the K-BKZ integral model and the pom-pom molecular model, which can be written in a differential form. The present work gives a comparative picture of the rheological capabilities of the K-BKZ vs. pom-pom model, and their numerical requirements for solving a benchmark problem, that of the flow of commercial LDPE melt through axisymmetric and planar abrupt contractions, for which experimental data are available. |
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Recent advances in the numerical simulation of polymer processing in LES CAHIERS DE RHEOLOGIE, Vol. XVII, N° 1 (10/2000)
