Modélisation simplifiée des processus de laminage

Abstract : The initial aim of the thesis was to propose a new simplified model for rolling allowing a rapid calculation, if possible, in real time, so that the model would eventually integrate into a management tool production machines. This model should not neglect the elastic deformations in order to be applied to the study of phenomena associated with the change in bandwidth or flatness phenomena. It must also be open enough that we can integrate the description of microstructure of polycrystalline material and possibly take into account the deformation of rolling rolls. To achieve this goal, we proposed to build a simplified semi-analytical model of rolling. In this type of model, the gradient of global transformation can be multiplicatively decomposed of the first local transformation "plastic" which transforms the initial local neighborhood of in the relaxed configuration, and the second local transformation "elastic" which transforms the relaxed configuration in the current configuration. This decomposition is the basis of thermodynamic analysis of the mechanical evolution when the material undergoes large elastoplastic transformations, which provides the concepts of internal forces and necessary variable state to write this behavior. We showed two approaches to the analytical calculation of the mechanical fields when the history of was known in the neighborhood of particle .We then proposed to study a particular class of elastoplastic evolution that we called "simple radial" and we showed that the evolutions followed the principle of minimum energy. Finally, we conjectured that this principle can be extended in steady state, which allowed to build a simplified model of the rolling process
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Huy Le Dang. Modélisation simplifiée des processus de laminage. Autre. Université Paris-Est, 2013. Français. ⟨NNT : 2013PEST1121⟩. ⟨pastel-00966940⟩

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