Asymmetric Creep Behavior of Ceramics

Title & Authors
Asymmetric Creep Behavior of Ceramics
Lim, H.J.; Jung, J.W.; Han, D.B.; Kim, K.T.;

Abstract
Asymmetric creep behaviors of ceramics under high temperature were investigated. Based on the Norton's power-low creep equation, multidirectional creep equations were proposed for general geometric loading conditions. The proposed equations were implemented into finite element program (ABAQUS) to simulate creep behaviors of ceramics in complicated loading conditions. The calculated results were compared with experimental data for uniaxial compression of Si-SiC C-ring and flexure of Si-SiC and $\small{Al_2O_3}$ in the literature. The finite element results agreed well with experimental data when the principal stresses are smaller than the threshold stress for creep damage. A good agreement was also obtained for damage zone in Si-SiC bending creep specimen compared with experimental data.
Keywords
Asymmetric Creep;Alumina;Bending;FEM;Cavity;
Language
Korean
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