DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 757 - 763
Section Industrial Applications
Published online 15 September 2009
DYMAT 2009 (2009) 757-763
DOI: 10.1051/dymat/2009106

Electromagnetic phenomena associated with dynamic deformation and fracture of rocks

K. Watanabe1, K. Ogawa2, K. Tanaka1, H. Kobayashi1 and K. Horikawa1

1  Osaka University, 1–3 Machikaneyama, Toyonaka, 560-8531 Osaka, Japan
2  Space Dynamics Laboratory, 3–6 Ondoyamacho, Narutaki, Ukyo-ku, 616-8255 Kyoto, Japan

Published online: 15 September 2009

In order to investigate the effect of the strain rate and the correlation between the load fluctuation and electromagnetic phenomena on deformation and fracture of rock, the quasi-static and the dynamic uniaxial compression tests were performed on quartzite, marble and sandstone under strain rates of 10−3 s−1 and 102 s−1, and the generated electromagnetic signals were simultaneously recorded during deformation of the rock specimen. As a result, it was found that clear transients in electromagnetic signals were accompanied by rapid stress drop during deformation and fracture and we noticed that the amplitude of the electromagnetic signal increased with increasing the strain rate. Furthermore, there is quite a possibility that quartz contributes much to generation of the EM event.

© EDP Sciences 2009