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Influence of microcracking on crack-tip toughness of alumina

Kounga Njiwa, Alain Brice and Galal Yousef, Susan and Fett, Theo and Rödel, Jürgen (2005):
Influence of microcracking on crack-tip toughness of alumina.
72, In: Engineering Fracture Mechanics, (7), pp. 1011-1019, ISSN 00137944, [Online-Edition: http://dx.doi.org/10.1016/j.engfracmech.2004.09.004],
[Article]

Abstract

Al2O3-samples with different grain sizes were produced and the crack-tip toughness KI0, also called intrinsic fracture toughness, was determined using two different measurement techniques. It appeared that KI0 depends strongly on specimen grain size with the mechanistic link provided by the increase of microcrack density with grain size. Results obtained using measurements of crack opening displacements (COD) lie considerably lower than values based on a method using bending tests of pre-notched bend bars. It is suggested that the latter method relies on the use of a notch with a microcrack, which in fact is different than the behavior of a long crack alone.

Item Type: Article
Erschienen: 2005
Creators: Kounga Njiwa, Alain Brice and Galal Yousef, Susan and Fett, Theo and Rödel, Jürgen
Title: Influence of microcracking on crack-tip toughness of alumina
Language: English
Abstract:

Al2O3-samples with different grain sizes were produced and the crack-tip toughness KI0, also called intrinsic fracture toughness, was determined using two different measurement techniques. It appeared that KI0 depends strongly on specimen grain size with the mechanistic link provided by the increase of microcrack density with grain size. Results obtained using measurements of crack opening displacements (COD) lie considerably lower than values based on a method using bending tests of pre-notched bend bars. It is suggested that the latter method relies on the use of a notch with a microcrack, which in fact is different than the behavior of a long crack alone.

Journal or Publication Title: Engineering Fracture Mechanics
Volume: 72
Number: 7
Uncontrolled Keywords: Fracture; Intrinsic toughness; COD; Microcracks
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: 20 Jun 2011 11:48
Official URL: http://dx.doi.org/10.1016/j.engfracmech.2004.09.004
Identification Number: doi:10.1016/j.engfracmech.2004.09.004
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