Chapter 29. Fracture Toughness by the Surface Crack in Flexure (SCF) Method

  1. John B. Wachtman Jr.
  1. Carl A. Tracy1 and
  2. George D. Quinn2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch29

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Tracy, C. A. and Quinn, G. D. (1994) Fracture Toughness by the Surface Crack in Flexure (SCF) Method, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch29

Author Information

  1. 1

    Fluid Management Co. Wheeling, IL 60090

  2. 2

    National Institute of Standards and Technology Gaithersburg, MD 20899

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • fracture toughness;
  • mechanical characterization;
  • surface crack in flexure;
  • knoop indentations;
  • controlled-surface flaw

Summary

The surface crack in flexure (SCF) method was used to evaluate the fracture toughness of ten advanced ceramics including alumina, silicon carbide, silicon nitride, titanium diboride, zirconia, and a whisker-reinforced alumina. Knoop indentations were used to create artificial flaws in flexure specimens. Residual stress zones were removed by polishing. Specimens were fractured in flexural loading, the precrack sizes measured, and fracture toughness computed using the Newman-Raju stress intensity shape factors.