Electromagnetic phenomena associated with dynamic deformation and fracture of rocks

K. Watanabe; K. Ogawa; K. Tanaka; H. Kobayashi; K. Horikawa

doi:doi:10.1051/dymat/2009106

All issues

Volume 1 (2009)

10.1051/dymat/2009106

Abstract

Issue		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
DOI		https://doi.org/10.1051/dymat/2009106
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

Abstract
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.