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In Situ Measurements of Bridged Crack Interfaces in the Scanning Electron Microscope

Rödel, Jürgen and Kelly, James F. and Lawn, Brian R. (1990):
In Situ Measurements of Bridged Crack Interfaces in the Scanning Electron Microscope.
In: Journal of the American Ceramic Society, pp. 3313-3318, 73, (11), ISSN 0002-7820, [Online-Edition: http://dx.doi.org/10.1111/j.1151-2916.1990.tb06454.x],
[Article]

Abstract

A device for in situ SEM examination of crack propagation during loading of compact tension specimens is described, with a specific demonstration on an alumina ceramic. The device facilitates direct qualitative observations of the inception and subsequent frictional pullout of grain-localized bridges at the crack interface. Quantitative data on the bridging mechanism are obtained from measurements of the crack-opening displacements behind the crack tip. The crack profile is found to be closer to linear than parabolic at the bridged interface. Deconvolution of these crack-opening data allow for an evaluation of the closure tractions operative at the crack walls within the bridging zone, and thence the R-curve.

Item Type: Article
Erschienen: 1990
Creators: Rödel, Jürgen and Kelly, James F. and Lawn, Brian R.
Title: In Situ Measurements of Bridged Crack Interfaces in the Scanning Electron Microscope
Language: English
Abstract:

A device for in situ SEM examination of crack propagation during loading of compact tension specimens is described, with a specific demonstration on an alumina ceramic. The device facilitates direct qualitative observations of the inception and subsequent frictional pullout of grain-localized bridges at the crack interface. Quantitative data on the bridging mechanism are obtained from measurements of the crack-opening displacements behind the crack tip. The crack profile is found to be closer to linear than parabolic at the bridged interface. Deconvolution of these crack-opening data allow for an evaluation of the closure tractions operative at the crack walls within the bridging zone, and thence the R-curve.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 73
Number: 11
Uncontrolled Keywords: scanning electron microscopy; cracks; bridging; pullout; toughness
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 12:20
Official URL: http://dx.doi.org/10.1111/j.1151-2916.1990.tb06454.x
Identification Number: doi:10.1111/j.1151-2916.1990.tb06454.x
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