Open Access
Issue
Oil & Gas Science and Technology - Rev. IFP
Volume 61, Number 6, November-December 2006
Dossier: Deformation of Solid Polymers
Page(s) 781 - 787
DOI http://dx.doi.org/10.2516/ogst:2006017
Published online 01 January 2007
Oil & Gas Science and Technology - Rev. IFP, Vol. 61 (2006), No. 6, pp. 781-787
DOI: 10.2516/ogst:2006017

Identification by Genetic Algorithm of a Constitutive Law Taking into Account the Effects of Hydrostatic Pressure and Speeds

Identification par algorithme génétique d'une loi de comportement prenant en compte les effets de vitesses et de pression hydrostatique


J.C. Grandidier1 and É. Lainé1, 2

1  Laboratory of Mechanics and Physics of Materials, ENSMA, Téléport2, 1 avenue Clément Ader, BP40109, F-86961 Futuroscope Chasseneuil - France, email: grandidier@lmpm.ensma.fr,laine@apollor.com
2  Apollor, 1 rue du Bois de la Sivrite, 54500 Vandoeuvre-lès-Nancy - France, email: laine@apollor.com


Abstract
Meeting technical specifications requires the improvement of polymeric material behaviour used in the conception of structural parts notably in the automotive sector. It is in this context that Apollor, in collaboration with several industrial groups including Basell, Renault S.A., Renault Truck, Solvay and Visteon coordinated a research and development study on the problematic of polymer behaviour at high strain speeds. The methodology of characterization adopted includes an experimental tool backed up by numeric tools to identify by inverse methods the mechanical parameters of a literature model used in computation software. Thus, effects of hydrostatic pressure and speed on different parameters have been introduced in the model. Then, an identification protocol of the model parameters has been developed. It is based on a genetic algorithm that confers high effciency.


Résumé
La satisfaction des exigences des cahiers de charges passe par l'amélioration des modèles de comportement des matériaux polymères utilisés dans la conception de pièces structurales notamment dans le secteur automobile. C'est dans ce contexte qu'Apollor, en collaboration avec de grands groupes industriels tels que Basell, Renault S.A., Renault Truck, Solvay et Visteon a mis en place une étude de recherche et développement sur la problématique du comportement des polymères subissant des grandes vitesses de déformations. La méthodologie de caractérisation adoptée s'appuie sur un outil expérimental accompagné d'outils numériques d'identification par méthodes inverses des paramètres mécaniques d'une loi de comportement à implanter dans les codes de calcul. Ainsi, les e.ets de pression hydrostatique et de vitesses sur di.érents paramètres ont été introduits dans une loi de comportement de la littérature. Ensuite, un protocole d'identification des paramètres de la loi a été développé. Il est basé sur un algorithme génétique qui lui confère toute sa robustesse.



© IFP 2006

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