Design sensitivity analysis applied to injection molding for optimization of gate location and injection pressure / K. K. Kabanemi in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 3 (09/2002) . - p. 254-264 Titre : Design sensitivity analysis applied to injection molding for optimization of gate location and injection pressure Type de document : texte imprimé Auteurs : K. K. Kabanemi, Auteur ; J.-F. Hétu, Auteur ; A. Derdouri, Auteur Année de publication : 2002 Article en page(s) : p. 254-264 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this work, we develop a numerical simulation method to optimize the injection molding process using the design sensitivity analysis (DSA). The optimization concerns the filling stage and focuses on the location of gates in the mold cavity as well as the injection pressure profile, in order to minimize the fill time. Since the problem to be solved involves transient flow with free surface (flow front), the direct differentiation method is used to evaluate the sensitivities of the Hele-Shaw, filling fraction and energy equations with respect to the design variables used in the analysis. The search domain parameterization is coped with using B-spline functions. Sensitivity and state equations are solved by means of finite element method. The proposed numerical approach is combined with the sequential linear and quadratic programming method of the design optimization tools (DOT) to find new design variables at the end of each complete filling simulation. Starting from any initial gate locations and injection pressure profile, the iterative optimization procedure enables us to find the optimal gate locations together with the optimal injection pressure profile. Finally, numerical results involving complex mold geometries are presented and discussed to assess the validity and robustness of the proposed method. Note de contenu : - Basic equations of injection molding : Hele-Shaw approximation - Numerical discretization - DSA-based approach and optimization - Algorithm DOI : 10.3139/217.1692 En ligne : https://drive.google.com/file/d/14svlimdPnr4Ek-a1nrP-shtFqs7qfyoL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16012 [article]

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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)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 86-92 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3094 [article]

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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)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 4 (09/2006) . - p. 386-392 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2816 [article]

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Numerical simulation of a thermoviscoelastic frictional problem with application to the hot-embossing process for manufacturing of microcomponents / K. K. Kabanemi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 174-184 Titre : Numerical simulation of a thermoviscoelastic frictional problem with application to the hot-embossing process for manufacturing of microcomponents Type de document : texte imprimé Auteurs : K. K. Kabanemi, Auteur ; J. P. Marcotte, Auteur ; J.-F. Hétu, Auteur ; M. Worgull, Auteur ; M. Heckele, Auteur Année de publication : 2009 Article en page(s) : p. 174-184 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Hot embossing is a compression molding technique used for high replication accuracy of small features. One of the most sensitive phases of the process is the de-embossing stage during which the patterned part has to be demolded. In this paper, the demolding stage is considered as a frictional contact problem between a rigid mold insert and a viscoelastic polymer sheet as it deforms and cools inside a mold under an applied force. The contact is modeled with a modified Coulomb's law of dry friction while a generalized Maxwell model is used to describe the polymer behavior during embossing, cooling and de-embossing stages. The heat transfer between the mold insert and the patterned polymer sheet is solved through a domain decomposition method. A finite element approximation based on a penalized technique is proposed and analyzed. The purpose of this modeling approach is to predict dimensional stability and residual shape of microcomponents in the hot embossing process. Such a prediction will allow one to assign appropriate processing conditions that minimize geometrical imperfections and increase replication accuracy. DOI : 10.3139/217.2227 En ligne : https://drive.google.com/file/d/1bzr4tIXABbqlRP-0xBGfT1uLTTyQNQ9X/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5249 [article]

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Three-dimensional filling and post-filling simulation of polymer injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 291-301 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 handle DOI : 10.3139/217.1643 En ligne : https://drive.google.com/file/d/1M8PaqJMLWGmtzEOlNvIZGakWe6dZDVAn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15913 [article]

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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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Three-dimensional numerical modeling of co-injection molding / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

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Three-dimensional numerical simulation of segregation in powder injection molding / F. Illinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 2 (05/2008)  

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Three-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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