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Elastic behavior of porous ceramics: application to nuclear fuel materials


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Titre de la revue : Journal of Nuclear Materials Volume : 336 N° : 2-3 Pagination : 145-155 Date de publication : 01/02/2005

Type de document > *Article de revue

Mots clés >

Unité de recherche > IRSN/DPAM/SEMCA

Auteurs > BARON Daniel, GATT Jean-Marie, LAUX Didier, MONERIE Yann

Date de publication > 01/02/2005

Résumé

This study deals with the determination of effective elastic properties of random porous ceramics. Ceramic-matrix composites with bi-modal pore shape (spherical and ellipsoidal pores randomly distributed) are considered. For such a microstructure, various micro-mechanical estimates are compared to three dimensional numerical simulations based on periodic homogenization. Effective elastic moduli are derived as a function of matrix properties, porosity and pore shape. In the case of nuclear fuel ceramics, spherical and ellipsoidal pores are identified to inter-granular and intra-granular pores respectively, and obtained effective elastic properties are compared to experimental micro-acoustic data.