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Journal of Materials Science

, Volume 43, Issue 6, pp 2077–2081 | Cite as

Mode-II shielding-curve of Al2O3 from measurement of cone crack angles

  • Theo FettEmail author
  • Gabriele Rizzi
  • Michael J. Hoffmann
  • Rainer Oberacker
  • Susanne Wagner
Letter
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Many ceramic materials exhibit the effect of an increasing crack growth resistance during crack extension. Especially in the case of coarse-grained materials, cracks generally follow the grain boundaries, leave the original crack plane and produce a crack-face roughness. In the theoretical analysis forces transmitted by local links between the two crack faces are smoothed and replaced by so-called continuous bridging stresses acting against the crack opening. As the consequence of such bridging stresses, there exists a shielding stress intensity factor term that shields the crack tip partially from the applied loads. This effect as a reason for the occurrence of R-curves is well documented in literature for cracks under pure mode-I loading conditions [1].

In addition it has to be expected that crack-face interactions will also affect crack extension under pure or superimposed mode-II loading as for instance outlined in literature for frictional crack-face interactions [2, 3, 4]. In [5]...

Keywords

Stress Intensity Factor Crack Length Cone Angle Shear Traction Applied Stress Intensity Factor 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Theo Fett
    • 1
    • 2
    Email author
  • Gabriele Rizzi
    • 1
  • Michael J. Hoffmann
    • 2
  • Rainer Oberacker
    • 2
  • Susanne Wagner
    • 2
  1. 1.Institut für Materialforschung IIForschungszentrum KarlsruheKarlsruheGermany
  2. 2.Institut für Keramik im MaschinenbauUniversität KarlsruheKarlsruheGermany

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