Étude et modélisation numérique 3D par éléments finis d'un procédé de traitement thermique de tôles embouties après chauffage par induction : Application à un renfort de pied central automobile

Abstract : Heat treatment of steel after localised induction heating is now a widespread process - especially in the automotive industry. This process has proved its reliability in the context of massive parts, but the distortions generated are still often insufficiently controlled when dealing with thin sheets. PSA-Peugeot-Citroen is interested in the analysis and understanding of the phenomena involved, as well as the numerical simulation of such processes. It is therefore within this framework and in within a partnership between PSA and CEMEF that this work has taken place, using as an application the heat treatment of centre pillars. Such a complex process requires the understanding of heat transfer, solid mechanics, metallurgy, electromagnetism, and their mutual interactions for heating as well as cooling. This work lies at the crossroads of several disciplines such as thermomechanics and electromagnetism, as well as numerical methods and experimental study. It follows various projects carried out in the laboratory dealing with heat transfer or mechanics, as well as a previous thesis focused on a coupled numerical model for quenching. It is also a first 3D approach for induction heating processes and related multiphysics couplings. The presentation of this work is divided into three main parts. We first describe the industrial context, the problematic and the previous studies carried out on this process, getting then to experimental studies conducted within this work: one is aimed at the industrial process and the other on a simplified model we have developed in order to understand better the physical phenomena which create distortions. These experimental studies, which have provided us with many results, underscore the need for a numerical model in order to gat a better in-depth understanding of the physics involved in the process. We then have three chapters devoted to the finite element models developed and used in our computer tool in order to simulate the coupled problems: heat transfer/electromagnetism, solid mechanics/metallurgy as well as the whole coupled structure. The third and last part of this report deals on one hand with the setting up of a semi-industrial cases as well as material parameters identification, and on the other hand with numerical results obtained and their comparison with experimental results. This model enables us to estimate in a first approach the distortions undergone by a thin structure during localized induction heat treatment. The present computer tool provides us with a solid basis for future developments enabling us to tackle with complex industrial problems.
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David Cardinaux. Étude et modélisation numérique 3D par éléments finis d'un procédé de traitement thermique de tôles embouties après chauffage par induction : Application à un renfort de pied central automobile. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1560⟩. ⟨tel-00345259⟩

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