HAL Id: hal-01495800
https://hal.archives-ouvertes.fr/hal-01495800
Submitted on 26 Mar 2017
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Identification de la loi de comportement cristallin du Zirconium à partir de la réponse locale et globale d’un
polycristal
Halim Haddadi, Abdellah Salahouelhadj
To cite this version:
Halim Haddadi, Abdellah Salahouelhadj. Identification de la loi de comportement cristallin du Zir- conium à partir de la réponse locale et globale d’un polycristal. 8e Colloque national en calcul des structures, CSMA, May 2007, Giens, France. �hal-01495800�
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CNRS-LPMTM (UPR 9001) – Université Paris 13 – Institut Galilée 99, avenue J.-B. Clément, 93430 Villetaneuse, France
haddadi@lpmtm.univ-paris13.fr
RÉSUMÉ. Le but de ce travail est l’identification des paramètres de la loi de comportement cristallin du Zirconium grade 702 en minimisant une fonction coût globale qui représente la somme pondérée de deux fonctions coût. La première fonction représente l’écart entre la courbe σ - ε expérimentale macroscopique et celle provenant d’un calcul EF polycristallin réalisé sur un VER. La deuxième fonction coût représente l’écart entre les champs de déformations expérimentaux mesurés par corrélation d’images de microgrilles, et ceux simulés sur une microstructure réelle caractérisée par EBSD.
ABSTRACT. The aim of this study is the identification of the parameters of the crystalline behavior law of Zirconium by minimizing a global cost function which is the sum of two cost functions. The first function represents the difference between the experimental macroscopic stress-strain curve and the one coming from a crystalline finite element calculation realized on a RVE. The second cost function represents the difference between the experimental strain fields by digital image correlation technique of deformed micro-grids, and those simulated on a real microstructure characterized by EBSD.
MOTS-CLÉS: Identification, Polycristal, Méthode des Eléments Finis, Elastoviscoplasticité.
KEYWORDS: Identification; Polycrystals ; Finite Element Analysis; Elastoviscoplasticity.
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