Understanding rock fatigue Part II: possible damage mechanism

Erarslan, N. and Williams, D. J. (2012). Understanding rock fatigue Part II: possible damage mechanism. In: ISRM International Symposium - EUROCK 2012. Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012, Stockholm , Sweden, (1-9). 28-30 May 2012.

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Name Description MIMEType Size Downloads
Author Erarslan, N.
Williams, D. J.
Title of paper Understanding rock fatigue Part II: possible damage mechanism
Conference name Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012
Conference location Stockholm , Sweden
Conference dates 28-30 May 2012
Proceedings title ISRM International Symposium - EUROCK 2012
Place of Publication Lisboa, Portugal
Publisher International Society for Rock Mechanics
Publication Year 2012
Sub-type Fully published paper
Start page 1
End page 9
Total pages 9
Collection year 2013
Language eng
Formatted Abstract/Summary
A novel outcome of the research described is the observation of the effect of indirect cyclic loading on the fracture toughness of rocks. The mode I fracture toughness (KIC) response to indirect tensile cyclic loading was found to be different from that under static loading in terms of ultimate load and damage mechanism in front of the chevron crack. A maximum reduction of the static KIC of 46% was obtained from the highest amplitude increasing cyclic loading test. A second series of cyclic tests were carried out under mode I-II (mixed mode) indirect tensile cyclic loading. The 45° and 70° inclined chevron notch cracks opened from the beginning of the cyclic loading test, whereas under monotonic loading the chevron notch cracks closed up to failure. This outcome is a very important finding for examining rock fatigue damage mechanisms.

Detailed scanning electron microscope (SEM) examinations were carried out of the surfaces of CCNBD specimens. When compared with static rupture, the main differences with the cyclically-loaded specimens are two-fold: (a) the number of fragments produced is much greater under cyclic loading than under static loading, and (b) intergranular cracks are formed due to particle breakage under cyclic loading compared with smooth and bright cracks along cleavage plans under static loading. Moreover, the SEM images showed that fatigue damage in Brisbane tuff is strongly influences by the failure of the matrix.

Keyword Fracture toughness
CCNBD
Rock fatigue
Increasing cyclic loading
SEM
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012 - the 2012 ISRM International Symposium

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Created: Wed, 02 Jan 2013, 15:49:45 EST by Julie Hunter on behalf of School of Civil Engineering