Original title: Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor
Translated title: Odhad zdánlivé lomové houževnatosti keramických laminátů založený na zobecněném faktoru hustoty deformační energie
Authors: Náhlík, Luboš ; Šestáková, Lucie ; Hutař, Pavel
Document type: Papers
Conference/Event: ECF17 - European Conference on Fracture /17./, Brno (CZ), 2008-09-02 / 2008-09-05
Year: 2008
Language: eng
Abstract: [eng] [cze]
The paper presented deals with fracture behavior of ceramic laminates. Assumptions of the linear elastic fracture mechanics and small scale yielding are considered. In this frame the residual stresses in individual layers of Al2O3/5vol.%t-ZrO2 (ATZ) and Al2O3/30vol.%m-ZrO2 (AMZ) are determined. The procedure based on generalization of Sih's strain energy density factor to the case of a crack touching the interfaces between two dissimilar materials is used for determination of effective values of stress intensity factor at material interfaces.Important increase of the fracture toughness at AMZ/ATZ interface was predicted in comparison to the fracture toughness of individual material components. Predicted values were compared with data available in literature and mutual good agreement was found. Procedure suggested can be used for estimation of resistance to crack propagation of multilayered structures and its design. Článek se zabývá lomovým chováním keramických laminátů. Předpokládá se platnost lineární elastické lomové mechaniky. Je použita metoda založená na hodnotě zobecněného faktoru hustoty deformační energie pro určení efektivní hodnoty součinitele intenzity napětí na rozhraní. Data jsou srovnávána s hodnotami uváděnými v literatuře a jsou s nimi v dobré shodě. Publikovaná procedura může být využita ke stanovení zdánlivé lomové houževnatosti vrstevnatých materiálů.
Keywords: bimaterial interface; ceramic composite; flaw tolerance; fracture toughness; layered structures; residual stress; strain energy density
Project no.: CEZ:AV0Z20410507 (CEP), KJB200410803 (CEP)
Funding provider: GA AV ČR
Host item entry: Proceedings of 17th European Conference on Fracture, ISBN 978-80-214-3692-3

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0168137

Permalink: http://www.nusl.cz/ntk/nusl-39708


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Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers