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Theses

Pliabilité des tôles en alliages d'aluminium pour la carrosserie automobile analyse des mécanismes d'endommagement

Abstract : The need for weight reduction in the automotive industry has led to the development of aluminum alloys for body panels on a number of mass-produced vehicles. 6xxx series alloys are selected for outer panels. These panels are often joined to inner panels by hemming. A poor surface aspect after hemming may be observed on the outer panel. In present work, the influence of manganese content and of bake hardening time on the bendability of 6xxx series alloy sheets has been analyzed. Damage mechanisms during bending of 6xxx aluminum sheets have been characterized experimentally and simulated by a mechanical model. Damage is controlled by the development of through thickness strain localization. The localization leads to the development of surface instabilities, splitting of the outermost grains and then crack propagation. The following works have been done:•strain localization has been characterized by EBSD observations,•study of strain localization by mechanical model based on microstructure,•study of grains splitting by crystal plasticity.The following results have been concluded:•the random texture allows to explain the strain localization,•spatial variation of the yield stress and overall strain hardening are the most influence material parameters which control the strain localization,•interaction between first neighbour grains controls grain splitting.
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https://tel.archives-ouvertes.fr/tel-00665574
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Submitted on : Thursday, February 2, 2012 - 11:38:07 AM
Last modification on : Friday, October 23, 2020 - 5:04:32 PM
Long-term archiving on: : Thursday, May 3, 2012 - 2:30:46 AM

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  • HAL Id : tel-00665574, version 1

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Laurent Mattei. Pliabilité des tôles en alliages d'aluminium pour la carrosserie automobile analyse des mécanismes d'endommagement. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. Français. ⟨NNT : 2011EMSE0602⟩. ⟨tel-00665574⟩

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