, Les premiers instants d'endommagement en fatigue du PA66GF30 pourraient être étudiés par microtomographie-X sur des essais in-situ de fatigue. Ces résultats devraient apporter des précisions, et confirmer, ou pas, notre proposition de scénario d'endommagement en fatigue uniaxiale. Perspectives de modélisation Nous avons mis en évidence l'existence d'une triple équivalence Temps-Température-Teneur en eau sur le comportment mécanique de la matrice polyamide 6,6. Ainsi, il est possible de rendre compte de cette triple sensibilité au travers de la vitesse équivalente à une température de référence et une teneur en eau de référence, Les moyens d'essais et les niveaux atteignables de résolution sur les ligne de lumières des synchrotrons, tel que l'ESRF, sont en constante amélioration

, Des efforts de recherche doivent maintenant principalement se tourner vers la modélisation du composite. Il faut distinguer deux modélisations qui peuvent être indépendantes: ? Modélisation du comportement statique sous chargement des pièces en PA66GF30

, ? Modélisation du cycle de fatigue de référence pour la prédiction de durée de vie de la pièce en conditions de service

, Dans les deux cas, il apparait nécessaire de partir des résultats de simulation d'injection (Mold-Flow) afin de s'appuyer sur sa prédiction d'orientation des fibres. Ainsi le tenseur d'orientation d'ordre 2 serait une donnée d'entrée. Notre apport à la modélisation viendrait ensuite s'insérer

, Ce nouveau maillon de la chaîne nous permettrait d'avoir un contrôle sur la méthode d'homogénéisation appliquée, ainsi que sur les lois de comportement et les critères utilisés

, Concernant la modélisation du comportement statique, nous avons fait le choix de nous orienter vers l'utilisation d'une homogénéisation multi-échelle stochastique (type FE 2 ) sur des

, VERs éléments finis tenant compte de l'orientation des fibres, avec la loi de comportement de la matrice PA66 présentée dans ce manuscrit. Cette méthode devrait être comparée à une méthode analytique déjà existante de type Mori-Tanaka

, Notre critère s'appuyant sur une analyse énergétique du 2000 ème cycle de fatigue, nous avons besoin de cette information. La stratégie serait de modéliser uniquement ce 2000 ème cycle et de ne pas apporter d'importance au chemin emprunté pour y parvenir

, Des outils numériques ont commencé à être développés et mis en place. Cependant, par manque de temps, cet aspect numérique du projet de thèse n'a pas encore donné lieu à des résultats pouvant être présentés ici. Ce travail devra donc être poursuivi

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