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Modélisation détaillée des soudures par point et laser pour simuler la rupture des assemblages automobiles

Abstract : Due to their slowness and their high cost, the classical methods of experimental characterization about the welded joints’ stress carrying capacity are unsatisfying for industrial purposes. This work provides, for different materials and several sheet thicknesses, an alternative approach based on the construction and on the validation of a volumic numerical model of spot-welds and Laser welds using the finite element method. Firstly, two methods of welded joint’s mechanical properties’ characterization as well as damage and rupture parameters are presented. Secondly, using the material model of Gurson- Tvergaard-Needleman, the welds’ behaviour under quasi-static and dynamic load cases has been simulated and compared with the experimental results. This comparison showed a satisfying correlation not only for the rupture’s pattern but also for the “force vs. displacement” curve characteristic of the weld. Finally, using the Laser-weld’s detailed model, two case studies have been realized to estimate respectively the consequence of geometrical and mechanical imperfections on the weld’ stress carrying capacity and to evaluate the “transferability” of mechanical data from a given Laser weld’s geometry to another one
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Submitted on : Tuesday, November 10, 2020 - 11:28:33 AM
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  • HAL Id : tel-02997791, version 1


Emmanuel H. J. Lamouroux. Modélisation détaillée des soudures par point et laser pour simuler la rupture des assemblages automobiles. Génie mécanique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, UVHC, (France), 2007. Français. ⟨NNT : 2007VALE0044⟩. ⟨tel-02997791⟩



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