Simulation numérique de la planéité des tôles métalliques formées par laminage

Abstract : We propose in this thesis finite element models to describe buckling phenomena that are often encountered in thin sheet rolling processes. Starting with a simplified model assuming buckling mode as being harmonic in the rolling direction, the code can detect the bifurcation points and describe post-buckling behavior. The model is not intended to reflect complex rolling loads, we proposed another more complete model taking into account all components of the residual stresses and able to couple the phenomena at the upstream of the roll mill with the buckling phenomena at the downstream domain. Existing models generally treat iterative couplings between the zone under the bite and the buckling phenomena (Abdelkhalek's thesis) or direct coupling but it is limited to represent buckling modes (Counhaye's thesis). In this thesis, we propose a direct coupling between the upstream of the roll mill and the downstream domain using a rolling code LAM3 to describe the bite and a shell model to describe buckling phenomena in the downstream domain of the sheet. We used Arlequin method which is one of the most flexible coupling techniques to couple both models. This method leads to a partition of the space, each model being valid in a part of the domain. Both models should be considered valid in intersection of two zones. The key points are the definitions of a moving coupling zone, of a relevant coupling operator and of a simple procedure to build varying meshes.To validate the proposed model, we performed some test cases including an industrial case and academic rolling test cases including edge-wave defects or local folds out of the roll mill. The results have been validated by comparison with experimental measurements and with reference models
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Kékéli Kpogan. Simulation numérique de la planéité des tôles métalliques formées par laminage. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0194⟩. ⟨tel-01751133⟩

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