Effect of Loading Rate on Fracture Behaviour of Rock Materials

In this paper, experiments are carried out to study the quasi-static and dynamic fracture behaviour of sedimentary, igneous and metamorphic rocks. The notched semi-circular bending method has been employed to determine fracture parameters over a wide range of loading rates using both a servo-hydraulic machine and a split Hopkinson pressure bar (SHPB). The time to fracture, crack speed and velocity of the moving specimen halves are measured by strain gauge, crack propagation gauge and high-speed photography on the macroscopic level. This study reveals clearly that: dynamic crack initiation and growth toughness increase with the increase of loading rate and crack speed; the kinetic energy of the moving specimen halves increases with increasing impact speed of the striker; and dynamic fracture energy and increases rapidly with increasing crack speed.

Published in:
Rock Engineering and Rock Mechanics: Structures in and on Rock Masses
Presented at:
The 2014 ISRM European Rock Mechanics Symposium (EUROCK 2014), Vigo, Spain., May 27-29, 2014

 Record created 2014-03-16, last modified 2018-09-13

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