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Méthode multigrilles pour les grandes déformations et simulation numérique du procédé de roulage

Abstract : This work deals with the numerical simulation of the metal forging processes. It is connected to two principal themes: adapting the software Forge3® to the warm ring rolling forging process and reducing the time computation of the simulation. The first chapter describes the framework and the second part is dedicated to the study of the ring rolling process. Thanks to the introduction of a new definition of the floating dies within the software, it is then possible to compute precisely the particular tool kinematics. These improvements are confirmed by a direct comparison with experimental results. Then an identification work of the thermal parameters takes place. These parameters are validated by the study of two slightly different rings. The results are very encouraging; the simulation seems to predict well the inner die's trajectory and also the temperature evolution of the outer die during a whole cycle production. These results are true for both of the different types of ring. The last part presents a new method for resolving linear system based on three-level multigrid algorithm. The multigrid solver is based on the PETSc library and an automatic mesh coarsening technique that helps obtaining node nested coarser meshes. A parametrical study is carried out in order to reach an optimized configuration of the solver. The linear rate of convergence of the method is numerically proved. We obtain substantial results on different forging cases with reduction of the linear system computation by a factor 6 for a 60000 nodes system. This corresponds to a division of the global time simulation by a factor 3.
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https://pastel.archives-ouvertes.fr/tel-00173519
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Submitted on : Thursday, September 20, 2007 - 9:29:38 AM
Last modification on : Thursday, September 24, 2020 - 5:22:54 PM
Long-term archiving on: : Friday, April 9, 2010 - 2:32:43 AM

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  • HAL Id : tel-00173519, version 1

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Benoît Rey. Méthode multigrilles pour les grandes déformations et simulation numérique du procédé de roulage. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨tel-00173519⟩

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