Chapter 12. Dynamic Fracture Toughness and Microstructural Fracture Mechanisms in Ceramics

  1. John B. Wachtman Jr.
  1. T. Kishi,
  2. N. Takeda and
  3. B. N. Kim

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch12

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Kishi, T., Takeda, N. and Kim, B. N. (1990) Dynamic Fracture Toughness and Microstructural Fracture Mechanisms in Ceramics, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch12

Author Information

  1. Research Center for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • dynamic fracture;
  • ceramics;
  • microcracking;
  • transformation;
  • incubation

Summary

The dynamic fracture toughness of ceramics was evaluated by the strain-gauge method, the applicability of which was demonstrated by the two-dimensional dynamic finite element method. Five kinds of ceramics were tested: Al2O3, ZrO2 (TZP), Si3N4, Sic, and sialon. The fracture toughness of Al2O3 and TZP increased with increasing loading rate, while that of the others remained almost constant. For Al2O3, the increased toughness was explained by microcracking and branching near the precrack tip. In TZP, on the other hand, transformation to the monoclinic phase contributed to the increased toughness.