Advertisement

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. FettEmail author
  • 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 

References

  1. 1.
    Pezzotti G, Muraki N, Maeda N, Satou K, Nishida T (1999) J Am Ceram Soc 82:1249CrossRefGoogle Scholar
  2. 2.
    Kounga Njiwa AB, Fett T, Rödel J, Quinn GD (2004) J Am Ceram Soc 87:1502CrossRefGoogle Scholar
  3. 3.
    Kruzic JJ, Cannon RM, Ager JW III, Ritchie RO (2005) Acta Mater 53:2595CrossRefGoogle Scholar
  4. 4.
    Jelitto H, Felten F, Swain MV, Balke H, Schneider GA (2007) J Appl Mech 74:1197CrossRefGoogle Scholar
  5. 5.
    Fett T, Fünfschilling S, Hoffmann MJ, Oberacker R, Jelitto H, Schneider GA (2008) J Am Ceram Soc 91:3638 CrossRefGoogle Scholar
  6. 6.
    Fett T, Kounga Njiwa AB, Rödel J (2005) Eng Fract Mech 72:647CrossRefGoogle Scholar
  7. 7.
    Schneider GA, Fett T (2006) J Ceram Soc Jpn 114:1044CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • S. Fünfschilling
    • 1
  • T. Fett
    • 1
    Email author
  • 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

Personalised recommendations