Beringhier, Marianne (2006) Distribution et transport des variables de modèles polycristallins pour la prédiction de l'anisotropie mécanique des métaux en mise en forme. PhD thesis Mécanique Numérique, ENSMP - CEMEF Centre de Mise en Forme des Matériaux, ENSMP.
Abstract
In order to predict mechanical anisotropy due to metal microstructure and to follow crystallographical texture evolution in the simulation of forming processes, we use the coupling of the FE method with a polycrystalline model. For this kind of coupling, the polycrystal is often represented by its discretized texture, which is usually considered at each integration point in the mesh, thereby generating very large computation times. In order to decrease computation time for this kind of approach, we use in this work the Lagrangian particle concept. The Lagrangian particles allow to divide the studied volume into cells. Instead of considering one texture by integration point, the texture is distributed among the integration points in a given cell. Hence, at each integration point in the mesh, only a part of the texture is considered, consequently decreasing the overall number of textures in the mesh and computation time. Moreover, remeshing is often necessary when dealing with large deformations in the context of forming processes. The use of Lagrangian particles allows the microstructural variables to be transferred from the old mesh to the new one, whereas classical interpolation methods are not appropriated for some of these variables. This Lagrangian particles based method has been validated with the following experiments: uniaxial compression of samples of a rough-cast steel exhibiting a pronounced texture in its columnar zone induced by the casting process, and compression of an aluminium alloy exhibiting a pronounced texture induced by the extrusion. The method developed in this work is presented in the general framework of large deformations processes where the material microstructural variables evolve and determine the material constitutive behaviour.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Chastel, Yvan and Loge, Roland |
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| Date: | October 2006 |
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| Board of examiners: | Busso, Esteban and Rey, Colette and Signorelli, Javier and Tommasi, Andréa |
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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: | Anisotropy, Crystallographic texture, Microstructure, Finite elements, Remeshing, Computation time, Anisotropie, Texture cristallographique, Microstructure, éléments finis, Remaillage, Temps de calcul |
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