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            <title xml:lang="en">Experimental and numerical investigation in Friction Stir Welding. Microstructural study and thermomechanical modeling of transient boundary conditions at tool/workpiece.</title>
            <title xml:lang="fr">Étude expérimentale et numérique du procédé de soudage FSW (Friction Stir Welding). Analyse microstructurale et modélisation thermomécanique des conditions de contact outil/matière transitoires.</title>
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                <term xml:lang="en">Thermofluid modeling</term>
                <term xml:lang="fr">Alliages d’aluminium</term>
                <term xml:lang="fr">Modélisation thermofluide</term>
                <term xml:lang="fr">"onion rings"</term>
                <term xml:lang="fr">Banded structure</term>
                <term xml:lang="fr">Friction Stir Welding</term>
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              <p>Friction Stir Welding is a solid state joining process developed for transport applications as aerospace and naval. Since its introduction, a large number of investigations have been carried out but the process is not fully controlled. This work including experimental section in which welds have been generated by trigonal tool. The microstructure of these welds has been correlated with the material flow during the process. By understanding the material flow, the transient thermofluid model developed in the second section has been significantly enriched. This modeled has been developed for predicting the microstructure of the weld, especially, the "onion rings". Finally, the occurrence of "onion rings" has been correlated with the maximal strain rate reached by any particle in the weld seam, simulated by the model. However, the velocity has been refined at the vicinity of the tool through the trigonal pin modelling. This was helpful to move the material not only by friction but also by obstacle at the interaction tool/material. The above approach should enable, in this work layout, a better local thermomechanical description and consequently microstructural.</p>
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              <p>Le soudage FSW (Friction Stir Welding) est un procédé de soudage en phase solide pressenti pour des applications de transport en générale aérospatial et naval. Malgré le nombre considérable d’études qui ont été réalisées depuis son avènement en 1991, le contrôle du procédé n’est pas encore effectif.Ce travail a consisté en une partie expérimentale visant à la génération, par un outil trigone, de joints soudés dont la microstructure a été corrélée à l’écoulement de matière pendant le procédé. La connaissance de cet écoulement de matière a permis dans la deuxième partie d’enrichir le modèle thermofluide développé en périodique pour prédire la microstructure des joints de soudure FSW, notamment les "onion rings". Finalement, l’occurrence des "onion rings" a été corrélée à la vitesse de déformation maximale atteinte par les particules de la zone soudée, prédite par le modèle. Par ailleurs, un travail d’affinement du champ de vitesse en voisinage du pion est réalisé en modélisant l’outil trigone. Ce qui permet en plus de l’interaction (entrainement) outil/matière par frottement, d’intégrer une interaction par obstacle. Cette approche devrait permettre, en perspectives de ce travail, une meilleur description thermomécanique locale et par voie de conséquence microstructurale.</p>
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