Advanced finite element 3D injection molding / L. Silva in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 265-273 Titre : Advanced finite element 3D injection molding Type de document : texte imprimé Auteurs : L. Silva, Auteur ; J. Mauffrey, Auteur ; T. Coupez, Auteur ; Jean-François Agassant, Auteur ; C. Gruau, Auteur Année de publication : 2005 Article en page(s) : p. 265-273 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this paper, we present aspects and examples relating to Rem3D, a 3D finite element software dedicated to the computation of the entire injection molding cycle (filling, packing and cooling). Recent developments are presented, namely mesh generation and adaptation driven by a local natural metric, compressible Stokes and temperature solvers, as well as a multidomain approach. As an example of the application of Rem3D, computations have been compared with well instrumented experiments for a complex mold geometry. DOI : 10.3139/217.1888 En ligne : https://drive.google.com/file/d/1rgw_7bsUv04JhW3Xre5WoWx-jY1_SOj_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3063 [article]

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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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Structure development in injection molding / J. Smirnova in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 178-185 Titre : Structure development in injection molding : A 3D simulation with a differential formulation of the kinetic equations Type de document : texte imprimé Auteurs : J. Smirnova, Auteur ; Jean-Marc Haudin, Auteur ; J.-L. Chenot, Auteur ; B. Monasse, Auteur ; L. Silva, Auteur Année de publication : 2005 Article en page(s) : p. 178-185 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The purpose of the present work is to introduce a crystallization law into Rem3D, a 3D code written in C++ and dedicated to the injection molding of polymers. We kept the basic hypotheses of Avrami’s model and cast the kinetic equations into a differential system that is solved numerically. The variation of the density of potential nuclei with temperature is taken into account. Furthermore, the distribution of mean spherulite sizes can be deduced from the calculations. The second part of the paper is an experimental study of crystallization in well-controlled conditions (2D, isothermal or constant cooling-rate). It establishes a procedure for the determination of the nucleation and growth parameters used in the theoretical model, and gives a first validation of this model. Finally, the crystallization equations are introduced into Rem3D, in order to assess the feasibility of our new approach. Some typical results concerning the evolution of the transformed volume fraction in injection-molded parts are presented. DOI : 10.3139/217.1873 En ligne : https://drive.google.com/file/d/1g_0Bi-rQei21aYdF2fLHNmTclWCrnS0F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3078 [article]

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