A generalized temperature-dependent, non-Newtonian Hele-Shaw flow in injection and compression moulding

Steinbach, JÃ¶rg

doi:10.1002/(sici)1099-1476(19970925)20:14<1199::aid-mma910>3.0.co;2-5

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…Morris [13] has also analysed the stability of thermo-viscous Hele-Shaw flows and applied the results to magma flows in geological systems. Steinbach [14] has applied a Hele-Shaw flow model to the injection and compression moulding of plastics, but not considered instability of the flow. Wylie and Lister [15] show that temperature dependent viscosity can cause flow instability and apply this to lava flows erupting to a free surface.…”

Section: Model Assumptionsmentioning

confidence: 99%

Instability in filling thin walled continuous castings

Deam

Bednarz

Stokes

2005

Modelling Simul. Mater. Sci. Eng.

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A model of the fluid flow in a thin walled continuous caster is proposed. The stability of the flow is considered when the viscosity is temperature dependent. Mathematically the model can be described as a Hele-Shaw cell with heat loss. A condition for the growth of an uneven flow distribution in the cell is derived. This condition is related to the change in viscosity with the temperature of the liquid metal being cast, and the rate at which it is being cooled. An unstable flow distribution in the mould makes the continuous casting process difficult to control and can cause ‘lock-ups’ and ‘breakouts’.

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Section: Model Assumptionsmentioning

confidence: 99%

Instability in filling thin walled continuous castings

Deam

Bednarz

Stokes

2005

Modelling Simul. Mater. Sci. Eng.

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“…However, the conventional CAE packages such as C-Mold and MoldFlow are based on a generalized hele-shaw (GHS) model in which xy-dimensional elements are used to represent the three-dimensional geometry neglecting the inertia and the gap-wise velocity component for polymer melt flow in the thin plate [3,4] . Due to these limits of GHS model, the filling behavior of micro pattern can not be predicted.…”

Section: Introductionmentioning

confidence: 99%

Filling Behavior of Polymer Melt in Micro Injection Molding for V-Grooves Pattern

Kim¹,

Kim²

2014

Journal of the Korean Society of Manufacturing Technology Engin

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ARTICLE INFO ABSTRACTArticle history:This study uses two numerical approaches to analyze the filling behavior of micro patterns on micro-injection molding for V-grooves pattern which cannot be simulated with conventional CAE packages. The parametric studies have been performed to examine the fidelity of micro patterns with respect to temperature, pressure, inlet velocity and pattern location on the mold according to the boundary condition from the macro pressure and velocity data which can be obtained by conventional CAE packages. Through these numerical approaches, the filling behavior of polymer melt in micro patterns can be understood, the quality of replication can be predicted, and the V-groove pattern can be shaped uniformly during the process of injection molding.

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Penalty formulation for postfilling analysis during injection molding

Kang

Kim

Lee

2007

Numerical Methods in Fluids

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SUMMARYWe propose an approximate method that can simulate the packing stage during the injection molding using the penalty parameter method. In order to account for the compressibility effect, an update scheme based on similarity between the slightly compressible and the penalty formulations is proposed. The method allows for solving the entire injection molding process using a single algorithm with the penalty method in spite of the transition from the incompressible regime during the filling stage into the compressible regime for the packing stage. Several test cases have been presented to prove the validity of the method. It has been shown that the accuracy of the proposed method is identical to that of the mixed method.

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A generalized temperature-dependent, non-Newtonian Hele-Shaw flow in injection and compression moulding

Cited by 5 publications

References 33 publications

Instability in filling thin walled continuous castings

Instability in filling thin walled continuous castings

Filling Behavior of Polymer Melt in Micro Injection Molding for V-Grooves Pattern

Penalty formulation for postfilling analysis during injection molding

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