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- W2174338768 abstract "During the last years many researchers put so much effort to design layered structures combiningdifferent materials in order to improve low fracture toughness and mechanical reliability of the ceramics. It hasbeen proven, that an effective way is to create layered ceramics with strongly bonded interfaces. After thecooling process from the sintering temperature, due to the different coefficients of thermal expansion ofindividual constituents of the composite, significant internal residual stresses are developed within the layers.These stresses can change the crack behaviour. This results to the higher value of so-called apparent fracturetoughness, i.e. higher resistance of the ceramic laminate to the crack propagation. The contribution deals with adescription of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is toclarify crack behaviour in the compressive layer and provide computational tools for estimation of crackbehaviour in the field of strong residual stresses. The crack propagation was investigated on the basis of linearelastic fracture mechanics. Fracture parameters were computed numerically and by author’s routines. Finiteelement models were developed in order to obtain a stress distribution in the laminate containing a crack and tosimulate crack propagation. The sharp change of the crack propagation direction was estimated using Sih’scriterion based on the strain energy density factor. Estimated crack behaviour is qualitatively in a goodagreement with experimental observations. Presented approach contributes to the better understanding of thetoughening mechanism of ceramic laminates and can be advantageously used for design of new layered ceramiccomposites and for better prediction of their failure." @default.
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- W2174338768 date "2015-09-28" @default.
- W2174338768 modified "2023-10-17" @default.
- W2174338768 title "Estimation of stepwise crack propagation in ceramic laminates with strong interfaces" @default.
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- W2174338768 doi "https://doi.org/10.3221/igf-esis.34.12" @default.
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