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flatness defects

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Modélisation numérique du flambage des plaques minceset applications au laminage
Sami Abdelkhalek, Hamid Zahrouni, Michel Potier-Ferry, Pierre Montmitonnet, Nicolas Legrand, Pascal Buessler
Journal:

Mechanics & Industry / Volume 10 / Issue 3-4 / May 2009

Published online by Cambridge University Press:

05 August 2009, pp. 305-309

Print publication:

May 2009
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Dans certains procédés de mise en forme, tel que le laminage, l'apparition des contraintes résiduelles est inévitable et peut engendrer le flambage qui se traduit en défauts géométriques. Ceci exige la modélisation de ce phénomène d'instabilité mécanique afin de bien définir la forme et l'amplitude de ces défauts. Cela nécessite un modèle complet ayant des capacités pour le calcul du post-flambage. Dans le présent article, on présente un modèle de flambage possédant la faculté de détecter la charge critique de flambage et la forme post-flambée d'une plaque sous contraintes résiduelles. Des applications à des cas académiques et un cas de laminage seront aussi traités.