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

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

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.

Item Type: Article
Erschienen: 1991
Creators: Lathabai, S. and Rödel, Jürgen and Dabbs, T. and Lawn, B. R.
Title: Fracture mechanics model for subthreshold indentation flaws: II: Non-equilibrium fracture
Language: English
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.

Journal or Publication Title: Journal of Materials Science
Volume: 26
Number: 9
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: 13 Jun 2012 13:37
Official URL: http://dx.doi.org/10.1007/BF01130175
Identification Number: doi:10.1007/BF01130175
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