Fracture toughness measurement in fused quartz using triangular chevron-notched micro-cantilevers

We extend to flat surfaces the fracture toughness method presented in Acta Materialia vol. 86 (2015) p. 385 and measure in this manner the fracture toughness of fused quartz. Tests give 0.67±0.01MPam1/2, which agrees with earlier microscopic and macroscopic test data for the fast fracture toughness...

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Bibliographic Details
Published in:Scripta materialia 2016-02, Vol.112, p.132-135
Main Authors: Žagar, Goran, Pejchal, Václav, Mueller, Martin G., Michelet, Lionel, Mortensen, Andreas
Format: Article
Language:English
Subjects:
Chevron notch
Crack propagation
Finite element analysis
Flat surfaces
Focused Ion Beam (FIB)
Fracture toughness
Fused quartz
Toughness
Variance
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Summary:We extend to flat surfaces the fracture toughness method presented in Acta Materialia vol. 86 (2015) p. 385 and measure in this manner the fracture toughness of fused quartz. Tests give 0.67±0.01MPam1/2, which agrees with earlier microscopic and macroscopic test data for the fast fracture toughness of this material. Data show no signs of sub-critical crack growth; this observation is at variance with what one would expect from literature data on the phenomenon. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.09.032