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Subcritical Crack Growth in Y-TZP and Al2O3-Toughened Y-TZP

Knechtel, Mathias C. and Garcia, Daniel E. and Rödel, Jürgen and Claussen, Nils (1993):
Subcritical Crack Growth in Y-TZP and Al2O3-Toughened Y-TZP.
In: Journal of the American Ceramic Society, pp. 2681-2684, 76, (10), ISSN 0002-7820, [Online-Edition: http://dx.doi.org/10.1111/j.1151-2916.1993.tb04001.x],
[Article]

Abstract

Crack velocity curves for Y-TZP and Al2O3-toughened Y-TZP were determined for long cracks in compact tension specimens with an in situ fracture device on the stage of an optical microscope. Indications for a crack velocity threshold were found for both materials. Above this threshold, at 2.6 MPa·m1/2 for Y-TZP and 3.6 MPa·m1/2 for Al2O3-toughened Y-TZP, chemically assisted subcritical crack growth occurs over an extended regime of applied stress intensity factors of width 2.1–2.8 MPa·m1/2. It is recognized that the dependence of the shielding term on the crack-tip stress field renders transformation-toughened materials particularly susceptible to stress-corrosion cracking. This interrelation leads to the definition of a steady-state velocity at constant applied stress intensity factor. This velocity is obtained in the situation where the shielding term is fully defined by the present crack-tip stress field, not depending on prior loading history.

Item Type: Article
Erschienen: 1993
Creators: Knechtel, Mathias C. and Garcia, Daniel E. and Rödel, Jürgen and Claussen, Nils
Title: Subcritical Crack Growth in Y-TZP and Al2O3-Toughened Y-TZP
Language: English
Abstract:

Crack velocity curves for Y-TZP and Al2O3-toughened Y-TZP were determined for long cracks in compact tension specimens with an in situ fracture device on the stage of an optical microscope. Indications for a crack velocity threshold were found for both materials. Above this threshold, at 2.6 MPa·m1/2 for Y-TZP and 3.6 MPa·m1/2 for Al2O3-toughened Y-TZP, chemically assisted subcritical crack growth occurs over an extended regime of applied stress intensity factors of width 2.1–2.8 MPa·m1/2. It is recognized that the dependence of the shielding term on the crack-tip stress field renders transformation-toughened materials particularly susceptible to stress-corrosion cracking. This interrelation leads to the definition of a steady-state velocity at constant applied stress intensity factor. This velocity is obtained in the situation where the shielding term is fully defined by the present crack-tip stress field, not depending on prior loading history.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 76
Number: 10
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: 15 Jun 2012 08:29
Official URL: http://dx.doi.org/10.1111/j.1151-2916.1993.tb04001.x
Identification Number: doi:10.1111/j.1151-2916.1993.tb04001.x
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