An open-source framework for the computer aided design of complex profile extrusion dies / Ananth Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 276-285 Titre : An open-source framework for the computer aided design of complex profile extrusion dies Type de document : texte imprimé Auteurs : Ananth Rajkumar, Auteur ; L. L. Ferras, Auteur ; C. Fernandes, Auteur ; Olga. S. Carneiro, Auteur ; A. Sacramento, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2018 Article en page(s) : p. 276-285 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Filières d'extrusion Fluides, Mécanique des Matières plastiques -- Extrusion Modèles numériques Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : This work presents a new design procedure for improving the flow distribution in complex profile extrusion dies. The proposed approach is based on open source software and aims to motivate both academics and industrials to consider numerical methodologies in their future developments. A new solver was implemented in OpenFOAM computational library in order to model the steady non-isothermal flow of inelastic fluids. The developed code was verified with the Method of Manufactured Solutions. The capability of the proposed design procedure was experimentally assessed with an industrial case study, and the results obtained suggest that the computational based design aid is an excellent alternative to the usual experimental trial-and-error procedure used in industry. Note de contenu : - DIE-DESIGN METHODOLOGY - NUMERICAL MODELLING CODE IMPLEMENTATION VERIFICATION : Governing equations - Solver verification - CASE STUDY : Material characterization - Design of a new extrusion die DOI : 10.3139/217.3516 En ligne : https://drive.google.com/file/d/1YenL_DR0pFFF9byXyQVUlPxdMMJ20jOQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30575 [article]

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Modeling of plasticating injection molding - experimental assessment / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 558-569 Titre : Modeling of plasticating injection molding - experimental assessment Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; J. M. Nóbrega, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2014 Article en page(s) : p. 558-569 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Matières plastiques -- Moulage par injection Modèles mathématiques Plastification Index. décimale : 668.9 Polymères Résumé : A computational model for the description of polymer flow during the plasticating phase of the injection molding process is proposed. The polymer behavior is determined during the dynamic and static phases of the process. The model takes into account the backwards movement of the screw, the presence of a non-return valve and the conduction of heat during the idle times. Results for the dynamic and static phases of the plasticization are presented. The model is also used to study the influence of some important operative process parameters, such as, screw speed, backpressure, barrel temperatures and injection chamber length. The assessment of the computational results is made experimentally by comparing the average temperature calculated with measurements made in front of the screw nozzle using both, an IR camera and an IR thermometer. The differences between the computational and the IR camera measurements are below 5%. Note de contenu : - PLASTICATING IN INJECTION MOLDING : 1. Injection cycle - 2. System geometry - 3. Operating conditions - 4. Polymer properties - MATHEMATICAL MODEL : 1. Global model - 2. Plasticating phase - 3. Stationary phase - CASE STUDY - RESULTS AND DISCUSSION : 1. Plasticating results - 2. Experimental assessment DOI : 10.3139/217.2862 En ligne : https://drive.google.com/file/d/1PKnPdBFRT5VmulZYMftvN5VzzdUn6_eu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22221 [article]

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Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 213-223 Titre : Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2012 Article en page(s) : p. 213-223 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes génétiques Matières plastiques -- Moulage par injection Systèmes de refroidissement Index. décimale : 668.9 Polymères Résumé : The cooling process in polymer injection molding is of great importance as it has a direct impact on both productivity and product quality. In this paper a Multi-objective Optimization Genetic Algorithm, denoted as Reduced Pareto Set Genetic Algorithm with Elitism (RPSGAe), was applied to optimize both the position and the layout of the cooling channels in the injection molding process. The optimization model proposed in this paper is an integration of genetic algorithms and Computer-Aided Engineering, CAE, technology applied to polymer process simulations. The main goal is to implement an automatic optimization scheme capable of defining the best position and layout of the cooling channels and/or setting the processing conditions of injection moldings. In this work the methodology is applied to an L-shape molding with the aim of minimizing the part warpage quantified by two different conflicting measures. The results produced have physical meaning and correspond to a successful process optimization. Note de contenu : - Development of the optimization system - Case study - Results : Analysis of modelling results - Processing conditions optimization results - Cooling channels design optimization results - Optimization with cold runners - Simultaneous processing conditions and cooling channels design optimization results DOI : 10.3139/217.2511 En ligne : https://drive.google.com/file/d/1XWEoOP36g342emr4YzfxniQiKx5VVpUz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14689 [article]

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