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Comportement mécanique de soudures en alliage d’aluminium de la série 7xxx : de la microstructure à la modélisation de la rupture

Abstract : The electron beam welding of 7xxx series alloys leads to modification of their microstructureand consequently of their mechanical behavior. This study aimed toformulate a constitutive law including damage for welded structures by a local approachof fracture. For this purpose, the weld microstructure and the resulting mechanicalproperties have been characterized. The relationship between fine scaleprecipitate distribution and plastic properties has been established, as well as therelationship between coarse precipitation and micro-mechanisms of damage. Thefinite elements model takes into account the plastic behavior of the different zonesand reproduces the damage behavior of the fusion zone, which is the weakest linkof the structure due to evaporation of alloying elements during welding. This modelhas been validated in a large variety of stress conditions (sample geometry, notch).
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Quentin Puydt. Comportement mécanique de soudures en alliage d’aluminium de la série 7xxx : de la microstructure à la modélisation de la rupture. Matériaux. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENI068⟩. ⟨tel-01686325⟩

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