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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hinduja, Srichand
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Topics
Publications (14/14 displayed)
- 2021A Review on Microcellular Injection Mouldingcitations
- 2010Image processing methods for online measurement in radial-axial ring rolling
- 2009Investigating the feasibility of DLC-coated twist drills in deep-hole drillingcitations
- 2006Effect of MQL on the tool life of small twist drills in deep-hole drillingcitations
- 2006Boundary element stress analysis for bi-metallic dies in pressure diecastingcitations
- 2006Boundary element stress analysis for copper-based dies in pressure die castingcitations
- 2006Bi-metallic dies for rapid die castingcitations
- 2006Experimental investigation into the thermal behavior of copper-alloyed dies in pressure die castingcitations
- 2006The performance of small diameter twist drills in deep-hole drillingcitations
- 2002Optimization for boiling heat transfer determination and enhancement in pressure die castingcitations
- 2001Novel cooling channel shapes in pressure die castingcitations
- 2000An experimental and numerical investigation into the thermal behavior of the pressure die casting processcitations
- 2000Determination of heat transfer coefficients using a 1-d flow model applied to irregular shaped cooling channels in pressure diecastingcitations
- 2000Predicting heat extraction due to boiling in the cooling channels during the pressure die casting processcitations
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article
Boundary element stress analysis for bi-metallic dies in pressure diecasting
Abstract
The rate of heat extraction during the pressure die-casting process is central to both the quality and the cost of the finished castings. Energy-extraction rates in traditional steel dies are principally dictated by the cooling arrangement but also by the resistance path offered by the die. It has recently being shown that modification to cooling channel shapes and position can enhance sub-cooled nucleate boiling and substantially increase energy-extraction rates. Reducing the thermal resistance of the coolant boundary layer means that a significant proportion of the thermal resistance path becomes attributable to the die steel. Replacing the steel with copper can greatly improve heat extraction rates. This paper is concerned with the development of an efficient structural model for the analysis of bi-metallic copper-alloy steel dies. A cyclic boundary element stress model has been developed so that stress levels can be predicted and examined in both the copper and steel parts of the die. The stress model is based on the 3D thermoelastic boundary element method and produces stresses and deformation due to both mechanical and thermal loads on the system. The collocation based boundary element method is used for the prediction of transient stress fields over a thermally stabilised casting cycle. A novel approach called the simplex method is used to evaluate domain integrals that appear in the boundary integral formulation due to the presence of a transiently varying thermal field. This method involves meshing the domain with tetrahedral elements and then applying recursive radial integration to these tetrahedral elements. Repetitive application of the recursive scheme effectively reduces the initial volume integral to line integrals. Excellent accuracy is obtained with this method. In order to validate the model predicted strain fields are compared with strain gauge measurements obtained on a purpose built rig designed to be representative of the casting process and on a production die. © 2005 Elsevier B.V. All rights reserved.