A study on the evaluation of the fracture process zone in CCNBD rock samples

Erarslan, N. (2013) A study on the evaluation of the fracture process zone in CCNBD rock samples. Experimental Mechanics, 53 8: 1475-1489. doi:10.1007/s11340-013-9750-5

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Author Erarslan, N.
Title A study on the evaluation of the fracture process zone in CCNBD rock samples
Journal name Experimental Mechanics   Check publisher's open access policy
ISSN 0014-4851
Publication date 2013-10
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s11340-013-9750-5
Open Access Status
Volume 53
Issue 8
Start page 1475
End page 1489
Total pages 15
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2014
Language eng
Formatted abstract
The safety of many civil and mining concrete and rock structures including pre-existing crack networks is fundamentally affected by the mechanical behaviour of the material under static and cyclic loading. In cyclic loading case, cracks can grow at a lower load level compared to the monotonic case. This phenomenon is called fatigue due to subcritical crack propagation and depends on the behaviour of the fracture process zone (FPZ). This study presents the results of laboratory diametrical compression tests performed on Brisbane tuff disc specimens to investigate their mode-I (tensile) fracture toughness response to static and cyclic loading and relevant FPZ. The FPZ and fracture toughness response to cyclic loading was found to be different from that under static loading in terms of the ultimate load and the damage mechanisms in front of the chevron crack. A maximum reduction of the static fracture toughness (KIC ) of 42 % was obtained for the highest amplitude increasing cyclic loading test. Detailed scanning electron microscope (SEM) examinations were performed on the surfaces of the tips of the chevron notch cracks, revealing that both loading methods cause FPZ development in the CCNBD specimens. When compared with monotonic FPZ development, the main difference with the cyclically loaded specimens was that intergranular cracks were formed due to particle breakage under cyclic loading, while smooth and bright cracks along cleavage planes were formed under static loading. Further, the SEM images showed that fatigue damage in Brisbane tuff is strongly influenced by the failure of the matrix because of both intergranular and transgranular subcritical fracturing.
Keyword FPZ
Subcritical crack propagation
Rock fracture toughness
Rock fatigue
Increasing cyclic loading
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 25 April 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
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Created: Tue, 10 Sep 2013, 15:33:33 EST by Julie Hunter on behalf of School of Civil Engineering