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Design sensitivity analysis for the optimization of the injection molding process / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)
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Titre : Design sensitivity analysis for the optimization of the injection molding process Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; D. Pelletier, Auteur ; J.-F. Hétu, Auteur Année de publication : 2005 Article en page(s) : p. 86-92 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper presents an application of the Continuous Sensitivity Equation Method (CSEM) for the optimization of the injection molding process and its three-dimensional (3D) simulation by the finite element method. Finding the proper combination of process parameters such as injection speed, and melt and mold temperatures is critical to achieving a part that minimizes warpage and has the desired mechanical properties. Very often a successful design in injection molding comes at the end of a long trial and error process. Design Sensitivity Analysis (DSA) can help manufacturers improve their designs and can produce substantial savings in terms of both time and money. This work explores the ability of sensitivity analysis to predict the effects of design parameters on the performance of an injection molding process.
The paper presents results of a 3D finite element solution of the filling stage of the injection molding process. Sensitivities of the solution with respect to different process parameters are computed using the continuous sensitivity equation method. Solutions are shown for the nonisothermal filling of a rectangular plate with a polymer melt behaving as a non-Newtonian fluid. The paper presents the equations for the sensitivity of the velocity, pressure and temperature and their solution by a finite element method. Sensitivities of the solution with respect to the injection speed, the melt and mold temperatures and to the heat transfer coefficient at the cavity/mold interface are shown.DOI : 10.3139/217.1864 En ligne : https://drive.google.com/file/d/17OoMfEOckT_cHDM0OiangOqqXXUN4d_7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3094
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 86-92[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000687 - Périodique Bibliothèque principale Documentaires Disponible Numerical simulation of the effect of processing parameters on the flow behavior and breakthrough phenomenon in co-injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)
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Titre : Numerical simulation of the effect of processing parameters on the flow behavior and breakthrough phenomenon in co-injection molding Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2006 Article en page(s) : p. 386-392 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this work, a three-dimensional finite element flow analysis code is used to study the flow behavior during sequential co-injection molding. Non-Newtonian, non-isothermal flow solutions are obtained by solving the momentum, continuity and energy equations. Two additional transport equations are solved for tracking polymer/air and skin/core polymers interfaces. Solutions are presented for the filling of a spiral-flow mould for which experimental measurements are available. The numerical approach is shown to predict the core advance stage during which the core flow front catches up on the skin flow front and the core expansion phase when the flow fronts of core and skin materials advance together without breakthrough. The breakthrough phenomenon is also predicted and the numerical solution is in good agreement with the experiment. Those phenomena are hard to predict numerically and to our knowledge this is the first attempt at simulating the three-dimensional melt behavior during core expansion and core breakthrough. The predicted flow front behavior is compared to the experimental observations for various skin/core melt temperature, skin/core viscosity ratio, and core injection delay. Simulation results are in good agreement with experimental data and indicate correctly the trends in solution change when processing parameters are changing. DOI : 10.3139/217.0121 En ligne : https://drive.google.com/file/d/18cIgio3cLrinkkeutyMtE4YvVlFJwIC0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2816
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Code-barres Cote Support Localisation Section Disponibilité 005535 - Périodique Bibliothèque principale Documentaires Disponible Thermal flow instability in metal injection molding : experiment and simulation / J. F. Stevenson in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)
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Titre : Thermal flow instability in metal injection molding : experiment and simulation Type de document : texte imprimé Auteurs : J. F. Stevenson, Auteur ; F. Ilinca, Auteur Année de publication : 2006 Article en page(s) : p. 198-210 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Metal injection molding (MIM) is similar to plastic molding in many respects, but MIM compounds (metal powders with polymer binders) are more susceptible to thermally induced flow instability because of their higher thermal diffusivity. The flow patterns for a 17-4PH MIM compound were observed and simulated for mold filling through a diaphragm gate over a range of filling times and melt-mold interface temperatures. Simulation predicted the observed free annular jet and internal voids in the molded part and also predicted that initial contact with the outside wall of the gate would eliminate the jet, thereby reducing voids and surface defects. Parts made using a mold with a thicker gate verified these predictions. For combinations of operating conditions and mold geometry that gave large thermally induced viscosity gradients, both observation and simulation showed unstable, asymmetric flow. In these cases, flow slowed and stopped in one region of the gate and accelerated in other regions. When the flow was inherently unstable, simulations predicted an exponential growth in maximum temperature differences at symmetric locations in the mold gate. Based on 34 experimental observations and 102 simulations, a boundary was established between regions of stable and unstable flow in terms of the dimensionless Graetz number Gz (ratio of heat conduction time to fill time) and B, a dimensionless ratio indicating the sensitivity of viscosity to temperature differences in the mold. To establish a common basis for comparison of simulation and experiment, the melt-mold interface temperature was estimated using a heat transfer coefficient, which was a fixed value for experiment and a parameter for simulation. DOI : 10.3139/217.1908 En ligne : https://drive.google.com/file/d/1g5ud0P7fbFQcAdB0JDOuJV2Uu6gVrkYk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2915
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Code-barres Cote Support Localisation Section Disponibilité 004675 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional filling and post-filling simulation of polymer injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)
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Titre : Three-dimensional filling and post-filling simulation of polymer injection molding Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2001 Article en page(s) : p. 291-301 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper presents a finite element solution algorithm to solve polymer injection molding problems. The methodology solves the momentum, mass and energy conservation equations in three-dimensions. Packing and cooling stages of the injection molding process are modeled by considering compressibility effects. The procedure is aimed at processes in which three-dimensional effects are important. The method is also shown to be effective for thin parts. The performance of the proposed approach is measured on the injection of a plate for which experimental data are available. The procedure is also applied to a thick 3D part. The method results in accurate solutions and it is a useful tool to quantify the material behaviour on cases otherwise difficult to investigate. Note de contenu : - GOVERNING EQUATIONS : Flow and heat transfer equations - Compressibility modeling - Tracking of the polymer flow front during filling - Frozen layer and shrinkage computation
- SOLUTION ALGORITHM : Momentum-continuity equations - Energy equation - Front tracking equation
- NUMERICAL RESULTS : Filling and post-filling analysis of a plate (Material properties, State equation, Numerical situations) - Packing simulation for a car door handleDOI : 10.3139/217.1643 En ligne : https://drive.google.com/file/d/1M8PaqJMLWGmtzEOlNvIZGakWe6dZDVAn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15913
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Code-barres Cote Support Localisation Section Disponibilité 001017 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional finite element solution of the flow in single and twin-screw extruders / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)
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Titre : Three-dimensional finite element solution of the flow in single and twin-screw extruders Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2010 Article en page(s) : p. 275-286 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement tridimensionnel
Eléments finis, Méthode des
Extrudeuse bi-vis
Imagerie tridimensionnelleIndex. décimale : 668.9 Polymères Résumé : This work is aimed at the numerical modeling of the flow inside single and twin-screw extruders. Numerical solutions are obtained using a recently developed immersed boundary finite element method capable of solving the flow in the presence of complex non-stationary solid boundaries. The method is first validated against the solution obtained on a body-conforming grid for a single screw extruder and then applied to a twin-screw mixer. The time dependent single screw problem can also be solved in a rotating reference frame for which a steady state solution can be obtained. This allows the evaluation of time integration errors of the moving immersed interface algorithm. For instance the flow is considered isothermal and the material behaves as a Generalized Newtonian fluid. Because the viscosity depends on the shear rate, solutions will be shown for various rotation velocities of the screw and compared with solutions obtained on body-conforming grids. The method is shown to give very accurate results and can be used for a more in-depth investigation of the material behavior in extruders. DOI : 10.3139/217.2351 En ligne : https://drive.google.com/file/d/1iWUIP-2Z-d0vIVBdf6d6wmacgaM4k19P/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9824
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 275-286[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012380 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional numerical modeling of co-injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)
PermalinkThree-dimensional numerical study of the mixing behaviour of twin-screw elements / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
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