Karaseva, Olga (2005) Déformations élastiques des presses de forgeage et calcul parallèle. PhD thesis Mécanique Numérique, ENSMP - CEMEF Centre de Mise en Forme des Matériaux, ENSMP.
Abstract
To improve the precision of numerical simulations of cold forging processes a model of press deflection is introduced in Forge3® software. The press deformations are the result of a combined stiffness of the piece-tools-press that evolves during the forging process since the piece's geometry changes. Applying the virtual work principle to the whole system, the couples equations arise that determine the velocity/pressure field for the part and the tools, and also six additional degrees of freedom for rigid body motion that represent the deflection of the press. Account for this model in some industrial applications was found justified and efficient. The comparison of the simulation results with the experimental data has shown an excellent accordance, thus validating the model proposed and its implementation in Forge3® software. The second part of this work concerns the parallel computation and in particular the domain decomposition methods. On the base of two classical DD methods, the Schur complement method and FETI method, a new hybrid approach is proposed. It is better suited to the mix velocity/pressure formulation existing in Forge3®. The aspects of preconditioning and rigid body modes are as well treated. The results obtained while a performance study of these three methods for the Forge3® applications are very promising.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Fourment, Lionel |
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| Date: | December 2005 |
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| Board of examiners: | Roux, François-Xavier and Lanteri, Stéphane and Boyer, Jean-Claude and Beraudo, Christine and Digonnet, Hugues |
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| Ecole Doctorale: | ED 364 SCIENCES FONDAMENTALES ET APPLIQUEES |
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| Discipline: | Mécanique Numérique |
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| Collection (Fonds): | ENSMP |
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| Institution: | ENSMP |
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| Department: | ENSMP - CEMEF Centre de Mise en Forme des Matériaux |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Cold forging, Forging presses, Press deformation, Parallel computation, Domain decomposition, Feti, Hybrid method, Mix velocity, Pressure formulation, Forgeage à froid, Presses de forgeage, Déformation de presse, Calcul parallèle, Décomposition de domaine, Feti, Méthode hybride, Formulation mixte en vitesse, Pression |
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