Detail publikace

Odhad zdánlivé lomové houževnatosti keramických laminátů

NÁHLÍK, L. ŠESTÁKOVÁ, L. HUTAŘ, P.

Český název

Odhad zdánlivé lomové houževnatosti keramických laminátů

Anglický název

Estimation of apparent fracture toughness of ceramic laminates

Typ

článek v časopise - ostatní, Jost

Jazyk

en

Originální abstrakt

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.

Český abstrakt

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.

Anglický abstrakt

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.

Klíčová slova anglicky

Strain energy density factor, Apparent fracture toughness, Ceramic composite, Bi-material

Rok RIV

2009

Vydáno

03.09.2009

Nakladatel

Elsevier

Místo

Amsterdam

ISSN

0927-0256

Časopis

COMPUTATIONAL MATERIALS SCIENCE

Ročník

46

Číslo

3

Strany od–do

614–620

Počet stran

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"
}