Elastic behavior of porous ceramics: application to nuclear fuel materials

Jean-Marie Gatt (1, 2) , Yann Monerie (1, 2) , Didier Laux (1, 2) , Daniel Baron (3)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 SESC - Service d'Etudes de Simulation du Comportement du combustibles
3 EDF - EDF

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.

Domaines: Sciences de l'ingénieur [physics]

Jean-Marie Gatt, Yann Monerie, Didier Laux, Daniel Baron. Elastic behavior of porous ceramics: application to nuclear fuel materials. Journal of Nuclear Materials, 2005, 336 (2-3), pp.145-155. ⟨10.1016/j.jnucmat.2004.09.009⟩. ⟨hal-00327841⟩