Abstract
The two chevron notched rock fracture specimens, CB and SR, recommended by the ISRM to determine rock Mode I fracture toughness have several disadvantages, such as low loads required to initiate failure, relatively large amounts of intact rock core are required at the correct orientation, complicated loading fixtures and complex sample preparation for SR specimens. The Cracked Chevron Notched Brazilian Disc (CCNBD, Fig. 1.c) and the Cracked Straight Through Brazilian Disc (CSTBD, Fig.l.b) specimen geometries overcome these problems and are suitable for mixed fracture mode testing at the same time. The general case for the cracked Brazilian disc problem is when the sample is loaded diametrically with the crack inclined at an angle 0 to the loading direction (Fig. 1.a). Different combinations of mode I and mode II fracture intensities can be obtained simply by changing this angle.
Published Version
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