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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