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Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor
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SYSNO ASEP 0318827 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor Title Odhad zdánlivé lomové houževnatosti keramických laminátů založený na zobecněném faktoru hustoty deformační energie Author(s) Náhlík, Luboš (UFM-A) RID, ORCID
Šestáková, Lucie (UFM-A)
Hutař, Pavel (UFM-A) RID, ORCIDSource Title Proceedings of 17th European Conference on Fracture. - Brno : VUTIUM Brno, 2008 / Pokluda J. ; Lukáš P. ; Šandera P. ; Dlouhý I. - ISBN 978-80-214-3692-3 Pages s. 1522-1529 Number of pages 8 s. Publication form CD-ROM - CD-ROM Action ECF17 - European Conference on Fracture /17./ Event date 02.09.2008-05.09.2008 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords layered structures ; residual stress ; flaw tolerance ; bimaterial interface ; strain energy density ; fracture toughness ; ceramic composite Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects KJB200410803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2009
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