Fracture toughness and crack deflection in porous multilayered ceramics: Application to NiO-YSZ

N. Joulaee, A. Makradi, S. Ahzi, M. A. Khaleel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The arrangement of ceramic layers in laminated structures is an interesting way to enhance the flaw tolerance of brittle ceramic materials. The interfaces are expected to deflect cracks, increasing the fracture energy of the laminate compared to a monolithic material and thus raising the toughness. The target of this study is to predict the volume fraction of pores, in porous layers, required to cause crack deflection. Formulation of the fracture toughness and fracture energy as function of the material porosity is presented for random and ordered pores distribution. The effect of crack tip-flaws interaction is considered to estimate the pores volume fraction needed for crack deflection. In this work, dense and porous layers of NiO-YSZ material similar to the one used in the fuel cells technology are considered. The fracture energy of a porous material with an ordered distribution of pores shows a possibility of crack deflection at a porosity of 22.5%. However for a system with randomly distributed pores this possibility can be seen at 36% of porosity.

Original languageEnglish
Title of host publicationDiffusion in Solids and Liquids
Subtitle of host publicationHeat Transfer, Microstructure and Properties - 2nd Int. Conf. on Diffusion in Solids and Liquids, Mass Transfer, Heat Transfer, Microstructure and Properties DSL-2006
Pages69-74
Number of pages6
DOIs
Publication statusPublished - 1 Dec 2007
Event2nd International Conference on Diffusion in Solids and Liquids, DSL-2006 - Aveiro, Portugal
Duration: 26 Jul 200628 Jul 2006

Publication series

NameMaterials Science Forum
Volume553
ISSN (Print)0255-5476

Other

Other2nd International Conference on Diffusion in Solids and Liquids, DSL-2006
CountryPortugal
CityAveiro
Period26/7/0628/7/06

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Keywords

  • Crack deflection
  • Fracture energy
  • Fracture toughness
  • NiO-YSZ
  • Porosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Joulaee, N., Makradi, A., Ahzi, S., & Khaleel, M. A. (2007). Fracture toughness and crack deflection in porous multilayered ceramics: Application to NiO-YSZ. In Diffusion in Solids and Liquids: Heat Transfer, Microstructure and Properties - 2nd Int. Conf. on Diffusion in Solids and Liquids, Mass Transfer, Heat Transfer, Microstructure and Properties DSL-2006 (pp. 69-74). (Materials Science Forum; Vol. 553). https://doi.org/10.4028/0-87849-438-3.69