Identification de fonction seuils non quadratiques pour la modélisation de l'hydroformage

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*ARCELOR, Centre de Recherche Auto Applications, route de S

Leu, 60160 Montataire, France

patrick.duroux@arcelor.com joel.wilsius@arcelor.com

**Université de Technologie de Compiègne Laboratoire Roberval FRE 2833

BP 20529, 60205 Compiègne, France

RÉSUMÉ. La fonction seuil Hill’48 est largement utilisée dans les codes éléments finis car son identification est assez aisée à partir d’essais de traction simples. Cependant, dans le cas de l’hydroformage de tubes, des différences importantes entre simulation et expérience ont pu être notées. Ces écarts montrent que le modèle de Hill décrit mal l’état de traction plane qui est prédominant en hydroformage. C’est pourquoi d’autres fonctions seuil ont été testées.

Dans le cadre de ce travail, une méthode d’identification inverse basée sur différents essais expérimentaux représentatifs du procédé d’hydroformage a été utilisée pour déterminer les paramètres des modèles.

ABSTRACT

MOTS-CLÉS: Hydroformage, Elastoplasticité, Anisotropie, Identification inverse, Hill, Barlat.

KEYWORDS: Hydroforming, Elastoplasticity, Anisotropy, Inverse Identification, Hill, Barlat.

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