Chapter 4. Hertzian Indentation Stress Statistics in Microstructurally Tailored Sialons

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. K. C. Hoff1,
  2. J. R. Hellmann1 and
  3. R. Yeckley2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch4

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Hoff, K. C., Hellmann, J. R. and Yeckley, R. (2006) Hertzian Indentation Stress Statistics in Microstructurally Tailored Sialons, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch4

Author Information

  1. 1

    The Pennsylvania State University University Park, PA

  2. 2

    Kennametal Inc. Latrobe, PA

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • microstructurally;
  • PAC;
  • MTS;
  • disp

Summary

Contact damage behavior of microstructurally tailored Yb–SiAlON ceramics under a spherical indenter was examined. Environmental scanning electron microscopy and optical microscopy were used to characterize the Hertzian contact damage. Four different microstructures with different α–SiAl0N contents and grain morphology were evaluated for initiation of ring cracking. Onset of cracking was interrogated using acoustic emission spectroscopy and correlated to elastic failure models. Results indicated that a finer grain size distribution lead to a higher characteristic strength. From this study it was concluded that a fine grain size distribution is needed for high Hertzian contact strength.