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Bridging stresses in sintered reaction-bonded Si3N4 from COD measurements

Fett, Theo and Munz, D. and Kounga Njiwa, Alain Brice and Rödel, Jürgen and Quinn, G. D. (2005):
Bridging stresses in sintered reaction-bonded Si3N4 from COD measurements.
In: Journal of the European Ceramic Society, pp. 29-36, 25, (1), ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2004.03.005],
[Article]

Abstract

Crack opening displacement measurements on a sintered reaction-bonded Si3N4 ceramic obtained in bending tests with edge-V-notched specimens were evaluated. A procedure is proposed which allows a straight-forward evaluation of the experimental results in order to obtain the bridging stresses as a function of crack opening displacements. Bridging stresses up to 160 MPa were found acting over a distance of about 0.4 μm. In addition crack profile measurements were performed for Vickers indentation cracks which could approximately be described by use of the bridging relation obtained.

Item Type: Article
Erschienen: 2005
Creators: Fett, Theo and Munz, D. and Kounga Njiwa, Alain Brice and Rödel, Jürgen and Quinn, G. D.
Title: Bridging stresses in sintered reaction-bonded Si3N4 from COD measurements
Language: English
Abstract:

Crack opening displacement measurements on a sintered reaction-bonded Si3N4 ceramic obtained in bending tests with edge-V-notched specimens were evaluated. A procedure is proposed which allows a straight-forward evaluation of the experimental results in order to obtain the bridging stresses as a function of crack opening displacements. Bridging stresses up to 160 MPa were found acting over a distance of about 0.4 μm. In addition crack profile measurements were performed for Vickers indentation cracks which could approximately be described by use of the bridging relation obtained.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 25
Number: 1
Uncontrolled Keywords: Si3N4; Toughness and toughening; Fracture
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2004.03.005
Identification Number: doi:10.1016/j.jeurceramsoc.2004.03.005
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