Cohesive zone model for intergranular slow crack growth in ceramics: influence of the process and the microstructure - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Modelling and Simulation in Materials Science and Engineering Année : 2011

Cohesive zone model for intergranular slow crack growth in ceramics: influence of the process and the microstructure

Résumé

Ceramic polycrystals are prone to slow crack growth (SCG) which is stress and environmentally assisted, similarly to observations reported for silica glasses. The kinetics of fracture are known to be dependent on the load level, the temperature and the relative humidity. In addition, evidence is available on the influence of the microstructure on the SCG rate with an increase in the crack velocity with decreasing the grain size. Crack propagation takes place beyond a load threshold, which is grain size dependent. We present a cohesive zone model for the intergranular failure process. The methodology accounts for an intrinsic opening that governs the length of the cohesive zone and allows the investigation of grain size effects. A rate and temperature-dependent cohesive model is proposed (Romero de la Osa M, Estevez R et al 2009 J. Mech. Adv. Mater. Struct. 16 623-31) to mimic the reaction-rupture mechanism. The formulation is inspired by Michalske and Freiman's picture (Michalske and Freiman 1983 J. Am. Ceram. Soc. 66 284-8) together with a recent study by Zhu et al (2005 J. Mech. Phys. Solids 53 1597-623) of the reaction-rupture mechanism. The present investigation extends a previous work (Romero de la Osa et al 2009 Int. J. Fracture 158 157-67) in which the problem is formulated. Here, we explore the influence of the microstructure in terms of grain size, their elastic properties and residual thermal stresses originating from the cooling from the sintering temperature down to ambient conditions. Their influence on SCG for static loadings is reported and the predictions compared with experimenta

Domaines

Matériaux
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Dates et versions

hal-00640167 , version 1 (10-11-2011)

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Citer

M.R. de La Osa, R. Estevez, Christian Olagnon, Jérome Chevalier, C. Tallaron. Cohesive zone model for intergranular slow crack growth in ceramics: influence of the process and the microstructure. Modelling and Simulation in Materials Science and Engineering, 2011, 19 (7), pp.074009. ⟨10.1088/0965-0393/19/7/074009⟩. ⟨hal-00640167⟩
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