Flow behavior of PP-polymer nanocomposites in capillary and injection molding dies / E. Mitsoulis in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 2 (05/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 2 (05/2017) . - p. 217–226 Titre : Flow behavior of PP-polymer nanocomposites in capillary and injection molding dies Type de document : texte imprimé Auteurs : E. Mitsoulis, Auteur ; M. Battisti, Auteur ; A. Neunhäuserer, Auteur ; L. Perko, Auteur ; W. Friesenbichler, Auteur Année de publication : 2017 Article en page(s) : p. 217–226 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Matériaux hybrides Modèles mathématiques Polypropylène Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : For simulation of thin-wall injection molding, accurate viscosity data measured at shear rates up to 800,000 s?1 and more are important, but not available in any commercial material database. Such data can be measured on conventional injection molding machines with the help of a rheological mold, which is constructed like a standard injection mold with interchangeable dies. It enables operators to measure viscosity in time on their own machines at practically relevant shear rates (from 102 s?1 to 2 × 106 s?1). A special feature allows measuring the pressure dependency of viscosity using closed-loop counter pressure control. Experimental data are evaluated taking into account the melt temperature rise due to dissipative heating. Using capillary dies having different diameters, D, and length-to-diameter L/D ratios, a full rheological characterization has been carried out for a polypropylene-filled nanocomposite, and the experimental data have been fitted both with a viscous model (Cross) and a viscoelastic one (the Kaye – Bernstein, Kearsley, Zapas/Papanastasiou, Scriven, Macosko or K-BKZ/PSM model). Four injection molding dies have been also used to reach apparent shear rates up to 800,000 s?1. Particular emphasis has been given on the pressure-dependence of viscosity. It was found that only the viscoelastic simulations were capable of reproducing the experimental data well, while any viscous modeling always underestimates the pressures, especially at the higher apparent shear rates and L/D ratios. Note de contenu : - EXPERIMENTAL : Materials and rheological methods - MATHEMATICAL MODELING : Governing equations - Non-isothermal modeling - Pressure-dependent modeling - METHOD OF SOLUTION - RESULTS AND DISCUSSION : Rheological Characterization - Capillary dies simulations - Injection molding dies simulations DOI : 10.3139/217.3328 En ligne : https://drive.google.com/file/d/17EVfOTzl5DKh5qpJZWHxtG-8HLktWEaf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28501 [article]

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