Publication detail

Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor

NÁHLÍK, L. ŠESTÁKOVÁ, L. HUTAŘ, P.

Czech title

Odhad zdánlivé lomové houževnatosti keramických laminátů založený na zobecněném faktoru hustoty deformační energie

English title

Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor

Type

conference paper

Language

en

Original abstract

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. The procedure can contribute to enhancing of reliability and safety of the structural ceramic or generally of layered composites with strong interfaces.

Czech abstract

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.

English abstract

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. The procedure can contribute to enhancing of reliability and safety of the structural ceramic or generally of layered composites with strong interfaces.

Keywords in Czech

vrstevnaté konstrukce, zbytkové napětí, bimateriálové rozhraní, hustota deformační energie, lomová houževnatost, keramický kompozit

Keywords in English

layered structures, residual stress, flaw tolerance, bimaterial interface, strain energy density, fracture toughness, ceramic composite.

RIV year

2008

Released

02.09.2008

Publisher

VUTIUM Brno

Location

Brno

ISBN

9781617823190

Book

17th European Conference on Fracture

Pages from–to

1522–1529

Pages count

8

BIBTEX


@inproceedings{BUT31228,
  author="Luboš {Náhlík} and Lucie {Malíková} and Pavel {Hutař},
  title="Estimation of apparent fracture toughness of ceramic laminates based on generalized strain energy density factor",
  booktitle="17th European Conference on Fracture",
  year="2008",
  month="September",
  pages="1522--1529",
  publisher="VUTIUM Brno",
  address="Brno",
  isbn="9781617823190"
}