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Approche multi-échelle de l’hétérogénéité de déformation du dioxyde d’uranium

Type
Communications avec actes
Author
SOULACROIX, Julian
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
MICHEL, Bruno
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
GATT, Jean-Marie
92792 CEA-Direction de l'Energie Nucléaire [CEA-DEN]
KUBLER, Régis
211915 Mechanics surfaces and materials processing [MSMP]
BARRALLIER, Laurent
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/8334
Date
2013

Abstract

Le dioxyde d’uranium est le combustible nucléaire de référence pour la filière des réacteurs à eau pressurisée en France. Une étude expérimentale du comportement mécanique de ce matériau montre qu’il est le lieu d’une déformation hétérogène, c’est-à-dire d’une déformation plastique localisée, à l’échelle macroscopique. Des simulations numériques montrent que l’apparition et la forme de la localisation dépendent du comportement local du matériau, de la sollicitation appliquée, des conditions aux limites, mais aussi de la description initiale de la microstructure, et notamment la prise en compte d’une hétérogénéité initiale du matériau.

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