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Fracture mechanics model for subthreshold indentation flaws: II: Non-equilibrium fracture

Lathabai, S. ; Rödel, Jürgen ; Dabbs, T. ; Lawn, B. R. :
Fracture mechanics model for subthreshold indentation flaws: II: Non-equilibrium fracture.
[Online-Edition: http://dx.doi.org/10.1007/BF01130175]
In: Journal of Materials Science, 26 (9) pp. 2313-2321. ISSN 0022-2461
[Artikel], (1991)

Offizielle URL: http://dx.doi.org/10.1007/BF01130175

Kurzbeschreibung (Abstract)

In Part II of this two-part study we extend the shear-fault-microcrack model to non-equilibrium fracture, to allow for rate effects in the critical instability configurations in chemically interactive environments. The ldquocalibratedrdquoK-fields of Part I are combined with independently evaluated crack velocity functions to determine kinetic conditions for microcrack extension. The analysis enables evaluation of (i) a time delay in radial crack pop-in from a subthreshold flaw; (ii) a time dependence in the strength characteristics, in both the subthreshold and postthreshold domains. Comparisons with delayed pop-in and strength-stressing-rate literature data for silicate glasses in moist environments indicate that the analysis is capable of quantitative predictions of kinetic characteristics. In the strength data, the model accounts for the relatively high magnitudes, scatter and fatigue susceptibilities in the subthreshold region.

Typ des Eintrags: Artikel
Erschienen: 1991
Autor(en): Lathabai, S. ; Rödel, Jürgen ; Dabbs, T. ; Lawn, B. R.
Titel: Fracture mechanics model for subthreshold indentation flaws: II: Non-equilibrium fracture
Sprache: Englisch
Kurzbeschreibung (Abstract):

In Part II of this two-part study we extend the shear-fault-microcrack model to non-equilibrium fracture, to allow for rate effects in the critical instability configurations in chemically interactive environments. The ldquocalibratedrdquoK-fields of Part I are combined with independently evaluated crack velocity functions to determine kinetic conditions for microcrack extension. The analysis enables evaluation of (i) a time delay in radial crack pop-in from a subthreshold flaw; (ii) a time dependence in the strength characteristics, in both the subthreshold and postthreshold domains. Comparisons with delayed pop-in and strength-stressing-rate literature data for silicate glasses in moist environments indicate that the analysis is capable of quantitative predictions of kinetic characteristics. In the strength data, the model accounts for the relatively high magnitudes, scatter and fatigue susceptibilities in the subthreshold region.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Materials Science
Band: 26
(Heft-)Nummer: 9
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 13 Jun 2012 13:37
Offizielle URL: http://dx.doi.org/10.1007/BF01130175
ID-Nummer: 10.1007/BF01130175
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