35. Critical Frontal Process Zone Evaluation of Aluminum Titanate/Alumina Based Ceramics by SEVNB Technique

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Chun-Hong Chen and
  2. Hideo Awaji

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch35

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Chen, C.-H. and Awaji, H. (2004) Critical Frontal Process Zone Evaluation of Aluminum Titanate/Alumina Based Ceramics by SEVNB Technique, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch35

Author Information

  1. Nagoya Institute of Technology, Nagoya, Japan, 466 8555

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • frontal process zone;
  • sigle-edge v-notched beam;
  • ceramics;
  • polycrystallinc alumina;
  • aluminum titanate ceramics

Summary

This paper describes the frontal process zone (FPZ) toughening mechanism that generates intrinsic fracture toughness in polycrystalline ceramics. The estimation of the critical size of the FPZ of ceramics is proposed using a single-edge V-notched beam (SEVNB) technique. A three-point flexure test has been carried out with aluminum titanate ceramic samples with sharp V-shaped notches with the notch depth ranging from 70 μ m to 2000 μ m. The critical local stress is analyzed at a critical distance from the notch tip. The critical local stress approximates to the flexural strength of specimens (without notch) and hence the critical size of FPZ is estimated. This concept is based on the local fracture criterion depending on the linear fracture mechanics. The critical size of the FPZ, the fracture toughness, and the flexural strength are also estimated for several monolithic ceramics and alumina-based nanocomposites. The relation between the FPZ and mechanical properties of materials is discussed for those materials, and the results reveal that both the strength and the critical size of the FPZ are essential factors for improving the fracture toughness of ceramics.