Lathabai, Srinivasarao ; Rödel, Jürgen ; Lawn, Brian R. (1991)
Cyclic Fatigue from Frictional Degradation at Bridging Grains in Alumina.
In: Journal of the American Ceramic Society, 74 (6)
doi: 10.1111/j.1151-2916.1991.tb04109.x
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
ension—tension cyclic loading tests have been conducted on a coarse-grained alumina ceramic that exhibits toughnesscurve behavior by grain-interlock bridging. Fatigue effects are observed in the regions of both short cracks, using indentation flaws, and long cracks, using compact-tension specimens. A true mechanical fatigue effect is demonstrated by running the tests below the static fatigue limit. A custom-made device for in situ observation of crack propagation in the scanning electron microscope enables us to identify bridge degradation as a cause of the fatigue process. “Wear” debris cumulates at the sliding intergranular frictional contact points, indicating a loss of traction at the junction. The basis of a fracture mechanics model describing the effect of this frictional degradation in reducing crack-tip shielding is outlined and fitted to the data. It is suggested that the bridge degradation fatigue mechanism may be widespread in polycrystalline ceramics with pronounced toughness curves.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1991 |
| Autor(en): | Lathabai, Srinivasarao ; Rödel, Jürgen ; Lawn, Brian R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Cyclic Fatigue from Frictional Degradation at Bridging Grains in Alumina |
| Sprache: | Englisch |
| Publikationsjahr: | Juni 1991 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 74 |
| (Heft-)Nummer: | 6 |
| DOI: | 10.1111/j.1151-2916.1991.tb04109.x |
| Kurzbeschreibung (Abstract): | ension—tension cyclic loading tests have been conducted on a coarse-grained alumina ceramic that exhibits toughnesscurve behavior by grain-interlock bridging. Fatigue effects are observed in the regions of both short cracks, using indentation flaws, and long cracks, using compact-tension specimens. A true mechanical fatigue effect is demonstrated by running the tests below the static fatigue limit. A custom-made device for in situ observation of crack propagation in the scanning electron microscope enables us to identify bridge degradation as a cause of the fatigue process. “Wear” debris cumulates at the sliding intergranular frictional contact points, indicating a loss of traction at the junction. The basis of a fracture mechanics model describing the effect of this frictional degradation in reducing crack-tip shielding is outlined and fitted to the data. It is suggested that the bridge degradation fatigue mechanism may be widespread in polycrystalline ceramics with pronounced toughness curves. |
| Freie Schlagworte: | fatigue; friction; degradation; grains; bridging |
| 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: | 13 Jun 2012 13:41 |
| Letzte Änderung: | 05 Mär 2013 10:01 |
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