Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2004.tde-28072004-145944
Document
Author
Full name
Kémelli Campanharo Estacio
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2004
Supervisor
Committee
Mangiavacchi, Norberto (President)
Castelo Filho, Antonio
Vasconcellos, João Flávio Vieira de
Title in Portuguese
"Simulação do processo de moldagem por injeção 2D usando malhas não estruturadas"
Keywords in Portuguese
equação de Hele-Shaw
método de volumes finitos
moldagem por injeção
problema não isotérmico
Abstract in Portuguese
Title in English
Simulation of the 2D Injection Molding Process Using Unstructured Meshes
Keywords in English
finite volume method
Hele-Shaw equation
injetion molding
non isothermal problem
unstructured meshes
Abstract in English
Injection molding is one of the most important industrial processes for the manufacturing of thin plastic products. This process can be divided into four stages: plastic melting, filling, packing and cooling phases. The flow of a fluid characterized by high viscosity in a narrow gap is a problem typically found in injection molding processes. In this case, the flow can be described by a formulation known as Hele-Shaw approach. Such formulation can be btained from the three-dimensional conservation equation using a number of assumptions regarding the injected polymer and the geometry of the mold, together with the integration and the coupling of the momentum and continuity equations. This approach, referring to limitations of the mould geometry to narrow, weakly curved channels, is usually called 2 1/2D approach. In this work a technique for the simulation of the filling stage of the injection molding process, using this 2 1/2D approach, with a finite volume method and unstructured meshes, is presented. The modified-Cross model with Arrhenius temperature dependence is employed to describe the viscosity of the melt. The temperature field is 3D and it is solved using a semi-Lagrangian scheme based on the finite volume method. The employed unstructured meshes are generated by Delaunay triangulation and the implemented numerical method uses the topological data structure SHE - Singular Handle Edge, capable to deal with boundary conditions and singularities, aspects commonly found in numerical simulation of fluid flow.

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Publishing Date
2004-08-24

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