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A Novel Technique for Estimation of Critical Frontal Process Zone Size in Ceramics

[+] Author Affiliations
Seong-Min Choi, Masato Okamoto, Hideo Awaji

Nagoya Institute of Technology, Nagoya, Japan

Paper No. GT2002-30508, pp. 103-107; 5 pages
doi:10.1115/GT2002-30508
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

A novel technique for estimating the critical size of the frontal process zone in ceramics was proposed using a single-edge V-notched beam (SEVNB) test method. A three-point flexure test was carried out on a silicon nitride and two kinds of graphite test specimens with sharp V-shaped notches whose depths varied from 20 to 1,500 μm. The critical local stress was calculated at a critical distance from the notch tip. The critical size of the frontal process zone was determined as the distance between the notch tip and the point where the critical local stress had the same value as the flexural strength of test specimens without notches. The relationship among the critical size of the frontal process zone, the fracture toughness, and the flexural strength was discussed.

Copyright © 2002 by ASME
Topics: Ceramics

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