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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 2493921, 13 pages
https://doi.org/10.1155/2017/2493921
Research Article

Study on Fracture Initiation and Propagation in a Brazilian Disc with a Preexisting Crack by Digital Image Correlation Method

School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Correspondence should be addressed to Lin Luo; nc.ude.usc@1991oulnilusc

Received 10 January 2017; Revised 14 April 2017; Accepted 23 April 2017; Published 24 May 2017

Academic Editor: Hiroshi Noguchi

Copyright © 2017 Lin Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of a preexisting crack with different inclination angles and lengths on mechanical properties, fracture initiation, and propagation in a Brazilian disc was investigated in this paper. In the experiment, digital image correlation (DIC) method was employed to record the deformation in the specimen. Different failure patterns, depending on inclination angles and lengths of the preexisting crack, were observed. The fracture initiation position deviates from the tips of the preexisting crack with the inclination angle increasing from 0° to 72° at an interval of 18° per increment. Secondary cracks are more likely to occur in the Brazilian disc with a more inclined and longer preexisting crack. A finite-discrete element combined method ELFEN was used in the numerical investigation to simulate the failure process. This investigation shows that there are good correlations between the experimental and numerical results. Digital image correlation is a good method to obtain the quantitive full-field strain distribution and to observe the strain evolution process in a jointed rock.