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Optimisation d'opérations industrielles de pliage par la méthode des éléments finis

Abstract : Apparently, bending seems to be a basic sheet metal forming process. Nevertheless, the current technical part complexity implies accurate industrial bending processes. Springback phenomenon which occurs in complex parts upon tools removal can't be easily predicted. This problem is typical in mechanics: to find the right blank geometry depending on the boundary conditions imposed in terms of efforts and displacements. It means solving differential equations in regard with time and space variables, whose initial conditions are given by the volume boundary conditions. The chosen plasticity model and its identification are crucial for the quality of the solution. The general problem complexity is reduced as much as possible thanks to simplifying assumptions. The reduced equations integration is performed in an analytical way or thanks to a simplified numerical integration. However, the needed assumptions are too restrictive and the implementation is reduced to textbook cases. Industrial bending process can only be modelled by finite element code. The latter reproduces phenomena encountered during industrial bending processes: anticlastic curvature, neutral layer shifting, coining… A discussion is conducted to find out in which conditions a 2D simulation, that allows shorter calculation time, can be applied. These reliable models are used coupled with modal analysis methods of form errors to optimize tools.
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Virginie Pouzols. Optimisation d'opérations industrielles de pliage par la méthode des éléments finis. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENA002⟩. ⟨tel-00722228⟩

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