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Journal of Materials Science

, Volume 44, Issue 1, pp 335–338 | Cite as

Determination of the crack-tip toughness in silicon nitride ceramics

  • S. Fünfschilling
  • T. Fett
  • M. J. Hoffmann
  • R. Oberacker
  • H. Jelitto
  • G. A. Schneider
Letter
Fracture in most ceramic starts from natural cracks with sizes a 0 in the order of a few 10 μm introduced during the processing of these materials. A crack in a component starts to propagate when the externally applied stress intensity factor K appl exceeds the so-called crack-tip toughness K I0. In the absence of an increasing crack growth resistance, the strength σ c is exclusively governed by K I0 according to
$$ \sigma_{\text{c}} = \frac{{K_{\text{I0}} }}{{Y\sqrt a_{0} }},\quad Y \cong 1.3 $$

Keywords

Stress Intensity Factor Y2O3 Silicon Nitride Notch Root Radius Silicon Nitride Ceramic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • S. Fünfschilling
    • 1
  • T. Fett
    • 1
  • M. J. Hoffmann
    • 1
  • R. Oberacker
    • 1
  • H. Jelitto
    • 2
  • G. A. Schneider
    • 2
  1. 1.Institut für Keramik im MaschinenbauUniversität KarlsruheKarlsruheGermany
  2. 2.Institut für keramische HochleistungswerkstoffeTechnische Universität Hamburg-HarburgHamburgGermany

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