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                <term xml:lang="fr">calcul numérique</term>
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              <p>Ce travail est consacré à la simulation numérique de la propagation d’une fissure dans un matériau dont la rupture résulte de la création, la croissance et la coalescence de vides. Le comportement du matériau est décrit via un modèle de type Gurson prenant en compte les effets combinés de l’écrouissage, de l’adoucissement thermique, de la viscoplasticité et de l’endommagement ductile. La méthode des éléments finis étendus a été retenue pour décrire les conséquences des discontinuités fortes induites par la présence d’une fissure dans le maillage. Un critère basé sur un paramètre lié à l’endommagement en pointe de fissure est proposé afin de propager la fissure pré-existante. Considérant quelques simplifications, le travail présenté reproduit la propagation d’une fissure en 2D résultant de la croissance de vides induits par l’endommagement.</p>
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