Injection molding of fibre reinforced thermoplastics : Integration of fibre orientation and mechanical properties computations / H. Miled in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 547-556 Titre : Injection molding of fibre reinforced thermoplastics : Integration of fibre orientation and mechanical properties computations Type de document : texte imprimé Auteurs : H. Miled, Auteur ; L. Silva, Auteur ; T. Coupez, Auteur ; Jean-François Agassant, Auteur Année de publication : 2012 Article en page(s) : p. 547-556 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anisotropie Composites à fibres -- Moulage par injection Composites à fibres -- Propriétés mécaniques Composites à fibres courtes Composites thermoplastiques -- Moulage par injection Distribution et orientation des fibres Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection molding is widely used to process short fibre reinforced thermoplastics. The quality and especially the mechanical properties of the resulting part are linked to the mold conception (for example the gate(s) and the venting port(s) locations) and to the processing parameters which will govern fibre orientation distribution. Fibre orientation modelling is based on the well known Folgar and Tucker equation. The models differ one from another by the interaction parameter, the closure approximation and by the coupling with the rheology of the reinforced melt. Quantitative comparison with experiments is very tedious and generally limited to simple part geometries (plaque or disk). As a consequence, in complex geometries, fibre orientation distribution is experimentally checked using several techniques and the resulting anisotropic thermo-mechanical properties are computed using various homogenization theories. In this paper, we propose a first integrated approach of the injection molding of fibre reinforced thermoplastics starting from rheology of the material, orientation equation, interaction parameter and closure approximation. The resulting local fibre orientation distribution is then used in two ways in order to predict the mechanical properties of the part: first, using classical analytical homogenization theories, but based on the computed orientation tensor and not on an experimental one, and then, using numerical homogenization which consists in generating a Representative Elementary Volume (REV), determining its unidirectional mechanical properties and finally, in computing directly the anisotropic properties of the part. Note de contenu : - Fibre orientation calculation - Thermo-elastic anisotropic computation - Direct numerical simulation - Application to a plaque with complex gate geometry DOI : 10.3139/217.2602 En ligne : https://drive.google.com/file/d/1KDx14h4RnDYOWi6dz98Ptp8ndCgdRwlK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16632 [article]

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