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Modélisation de la propagation des fissures courtes en fatigue dans le cas du 316L

Published online by Cambridge University Press:  24 December 2010

Reda Yahiaoui  and
Bachir Ait Saadi
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Abstract

L’expérience a démontré que la fissure fatale n’est pas nécessairement la plus grande relevée à un moment donné de la fatigue d’un matériau et qu’elle peut être la résultante d’autres microfissures. Ainsi, le dommage (par fatigue) est souvent associé au développement et à la croissance de microfissures en surface. L’avantage de considérer une population de fissures comme facteur physique d’endommagement est que les longueurs de fissures et leur nombre sont des données quantifiables qui peuvent être mesurées en surface du matériau. La présente étude est conduite dans ce sens et vise à caractériser l’endommagement et son évolution par la mesure de la densité de fissures en surface. Un modèle numérique, basé sur des principes aléatoires de génération de fissures, de leur propagation et de leur interaction mutuelle, est proposé. Il est ensuite appliqué dans le cas du 316L à température ambiante et pour des déformations plastiques égales à 8 × 10-3, 4 × 10-3 et 8 × 10-4.

Keywords

Fatiguefissures courtesdurée de viedensité de fissurescoalescence316LFatigueshort cracksfatigue lifetimecrack densitycoalescence316L
Type
Research Article
Information
Mechanics & Industry , Volume 11 , Issue 5 , September 2010 , pp. 379 - 384
Copyright
© AFM, EDP Sciences 2010

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