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Influence of microcracking on crack-tip toughness of alumina

Kounga Njiwa, Alain Brice ; Galal Yousef, Susan ; Fett, Theo ; Rödel, Jürgen (2005)
Influence of microcracking on crack-tip toughness of alumina.
In: Engineering Fracture Mechanics, 72 (7)
doi: 10.1016/j.engfracmech.2004.09.004
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2005
Autor(en): Kounga Njiwa, Alain Brice ; Galal Yousef, Susan ; Fett, Theo ; Rödel, Jürgen
Art des Eintrags: Bibliographie
Titel: Influence of microcracking on crack-tip toughness of alumina
Sprache: Englisch
Publikationsjahr: Mai 2005
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Engineering Fracture Mechanics
Jahrgang/Volume einer Zeitschrift: 72
(Heft-)Nummer: 7
DOI: 10.1016/j.engfracmech.2004.09.004
Kurzbeschreibung (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.

Freie Schlagworte: Fracture; Intrinsic toughness; COD; Microcracks
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 20 Jun 2011 11:48
Letzte Änderung: 05 Mär 2013 09:48
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