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A unified finite element model for the injection molding process

Identifieur interne : 004705 ( Main/Exploration ); précédent : 004704; suivant : 004706

A unified finite element model for the injection molding process

Auteurs : E. J. Holm [Norvège] ; H. P. Langtangen [Norvège]

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Abstract

We present a simulation model for the injection molding process. A 2D Hele-Shaw approximation is adopted for the polymer flow between two flat plates, whereas the moving polymer-air front is handled by a level-set-like method. The 3D heat equation is solved using finite elements in the flow plane, a spectral method in the perpendicular direction, and finite differences in time. A domain imbedding technique enables simplified treatment of complex mold geometries. Local mesh refinement is applied to improve the numerical accuracy in the vicinity of the polymer-air front. The main advantage of the model is that a common 2D finite element mesh can be used for all the equations. Using object-oriented programming, the compound simulator is efficiently implemented as an assembly of separate simulators for each partial differential equation (PDE) in the model. A case study regarding a simplified model problem, which contains the principal physical effects in the injection molding process, is discussed. We also present simulation results for a more engineering-oriented example concerning the filling of a mold for a computer keyboard


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<term>Free boundary problem</term>
<term>Gas liquid interface</term>
<term>Heat transfer</term>
<term>Hele Shaw cell</term>
<term>Injection molding</term>
<term>Mesh generation</term>
<term>Mold filling</term>
<term>Non-Newtonian fluids</term>
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<term>Mécanique fluide numérique</term>
<term>Méthode élément fini</term>
<term>Moulage injection</term>
<term>Polymère</term>
<term>Fluide non newtonien</term>
<term>Cellule Hele Shaw</term>
<term>Génération maille</term>
<term>Méthode raffinement</term>
<term>Simulation numérique</term>
<term>Remplissage moule</term>
<term>Interface gaz liquide</term>
<term>Champ température</term>
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