Publication detail
Estimation of apparent fracture toughness of ceramic laminates
NÁHLÍK, L. ŠESTÁKOVÁ, L. HUTAŘ, P.
Czech title
Odhad zdánlivé lomové houževnatosti keramických laminátů
English title
Estimation of apparent fracture toughness of ceramic laminates
Type
journal article - other
Language
en
Original abstract
The paper presented deals with the fracture behaviour of ceramic laminates. The residual stresses in individual layers of Al2O3/5vol.%t-ZrO2 (ATZ) and Al2O3/30vol.%m-ZrO2 (AMZ) are determined. Assumptions concerning linear elastic fracture mechanics and small scale yielding are considered. In this frame the procedure based on a 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 the stress intensity factor on material interfaces. An important increase of fracture toughness at the AMZ/ATZ interface was predicted in comparison to the fracture toughness of individual material components. Predicted values were compared with data available in the literature and mutual good agreement was found. The procedure suggested can be used for estimation of resistance to crack propagation through multilayered structures and its design. The procedure can contribute to enhancing the reliability and safety of structural ceramics or, more generally, of layered composites with strong interfaces.
Czech abstract
Práce se zabývá odhadem tzv. zdánlivé lomové houževnatosti keramických laminátů. Je zde uvedena nová procedura umožňující odhad uvedené veličiny. Procedura je použita pro odhad zdánlivé lomové houževnatosti keramického laminátu na bázi Al2O3 a ZrO2. Výsledné hodnoty jsou srovnány s daty publikovanými v literatuře.
English abstract
The paper presented deals with the fracture behaviour of ceramic laminates. The residual stresses in individual layers of Al2O3/5vol.%t-ZrO2 (ATZ) and Al2O3/30vol.%m-ZrO2 (AMZ) are determined. Assumptions concerning linear elastic fracture mechanics and small scale yielding are considered. In this frame the procedure based on a 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 the stress intensity factor on material interfaces. An important increase of fracture toughness at the AMZ/ATZ interface was predicted in comparison to the fracture toughness of individual material components. Predicted values were compared with data available in the literature and mutual good agreement was found. The procedure suggested can be used for estimation of resistance to crack propagation through multilayered structures and its design. The procedure can contribute to enhancing the reliability and safety of structural ceramics or, more generally, of layered composites with strong interfaces.
Keywords in English
Strain energy density factor, Apparent fracture toughness, Ceramic composite, Bi-material
RIV year
2009
Released
03.09.2009
Publisher
Elsevier
Location
Amsterdam
ISSN
0927-0256
Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume
46
Number
3
Pages from–to
614–620
Pages count
7
BIBTEX
@article{BUT46862,
author="Luboš {Náhlík} and Lucie {Malíková} and Pavel {Hutař},
title="Estimation of apparent fracture toughness of ceramic laminates",
journal="COMPUTATIONAL MATERIALS SCIENCE",
year="2009",
volume="46",
number="3",
month="September",
pages="614--620",
publisher="Elsevier",
address="Amsterdam",
issn="0927-0256"
}