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), pp. 2681-2684. ISSN 0002-7820,
[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. ; Garcia, Daniel E. ; Rödel, Jürgen ; 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 of the journal: | 76 |
| Issue 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 |
| URL / URN: | 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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