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

Knechtel, Mathias C. ; Garcia, Daniel E. ; Rödel, Jürgen ; Claussen, Nils (1993)
Subcritical Crack Growth in Y-TZP and Al2O3-Toughened Y-TZP.
In: Journal of the American Ceramic Society, 76 (10)
doi: 10.1111/j.1151-2916.1993.tb04001.x
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 1993
Autor(en): Knechtel, Mathias C. ; Garcia, Daniel E. ; Rödel, Jürgen ; Claussen, Nils
Art des Eintrags: Bibliographie
Titel: Subcritical Crack Growth in Y-TZP and Al2O3-Toughened Y-TZP
Sprache: Englisch
Publikationsjahr: Oktober 1993
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Jahrgang/Volume einer Zeitschrift: 76
(Heft-)Nummer: 10
DOI: 10.1111/j.1151-2916.1993.tb04001.x
Kurzbeschreibung (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.

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: 15 Jun 2012 08:29
Letzte Änderung: 11 Mär 2013 09:49
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