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Anastasiadis, C.
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Anastasiadis, C.
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- PublicationOpen AccessElectrict and Electromagnetic signals emitted from rocks under stress up to fracture. Experimental results(2008-02-23)
; ; ; ; ; ; ;Stavrakas, I.; Technological Educational Institution of Athens ;Triantis, D.; Technological Educational Institution of Athens ;Anastasiadis, C.; Technological Educational Institution of Athens ;Nardi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carluccio, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Vallianatos, F.; Technological Educational Institution of Crete; ; ; ; ; The application of mechanical stress on rock sample can stimulate elecric and electromagnetic signal emission. Such emissions can be detected experimentally. In this work, experiments that show up Electric and Electromagnetic signal emissions during the application of mechanical stress with various modes, are described. The experimental results manifest that such Electric and Electromagnetic signals can be used as precursors of the upcoming failure.252 691 - PublicationOpen AccessThe spectrum of thermally stimulated currents in rock samples from KTB drilling: preliminary results(2001-04)
; ; ; ; ; ;Anastasiadis, C.; Technological Educational Institution of Athens, Greece ;Triantis, D.; Technological Educational Institution of Athens, Greece ;Vallianatos, F.; Technological Educational Institution of Crete, Greece ;Nover, G.; Mineralogisches Institut der Universitat Bonn, Germany ;Nomicos, C.; Technological Educational Institution of Athens, Greece; ; ; ; The technique of thermally stimulated depolarization currents (TSDC) was applied to fine grained amphibolite rock samples extracted from KTB drilling. Each sample was cooled down to liquid nitrogen temperature and consequently heated at a constant rate b = 4 K/min while at the same time it was shorted by a sensitive electrometer. Thermocurrent glow curves were detected in the range from 180 to 360 K. By applying the TSDC method, an effort was made to carry out a preliminary analysis of the TSDC spectrum.163 165 - PublicationOpen AccessCorrelation of pressure stimulated currents in rocks with the damage parameter(2007-02)
; ; ; ; ;Anastasiadis, C.; Department of Electronic Engineering, Technological Educational Institution (TEI) of Athens, Greece ;Stavrakas, I.; Department of Electronic Engineering, Technological Educational Institution (TEI) of Athens, Greece ;Triantis, D.; Department of Electronic Engineering, Technological Educational Institution (TEI) of Athens, Greece ;Vallianatos, F.; Department of Natural Resources & Environment, Technological Educational Institute of Crete, Chania, Greece; ; ; Pressure Stimulated Current (PSC) experiments were conducted on marble samples to correlate PSC with the damage parameter, D. The phenomena and procedures taking place in the vicinity of the fracture limit were observed and analytically described. PSC recordings were conducted by application of uniaxial compressional stress, both at a constant stress rate and at a constant deformation rate. A linear relationship was shown to exist between the emitted PSC and the damage parameter which quantifies the deviation from linear elasticity and the concentration of microcracks.252 501 - PublicationOpen AccessPressure Stimulated Currents (PSC)in marble samples(2004)
; ; ; ; ;Anastasiadis, C.; Department of Electronics, Technological Educational Institution of Athens, Greece ;Triantis, D.; Department of Electronics, Technological Educational Institution of Athens, Greece ;Stavrakas, I.; Department of Electronics, Technological Educational Institution of Athens, Greece ;Vallianatos, F.; Department of Natural Resources Engineering, Technological Educational Institute of Crete, Greece; ; ; The electrical behaviour of marble samples from Penteli Mountain was studied while they were subjected to uniaxial stress. The application of consecutive impulsive variations of uniaxial stress to thirty connatural samples produced Pressure Stimulated Currents (PSC). The linear relationship between the recorded PSC and the applied variation rate was investigated. The main results are the following: as far as the samples were under pressure corresponding to their elastic region, the maximum PSC value obeyed a linear law with respect to pressure variation. In the plastic region deviations were observed which were due to variations of Young s modulus. Furthermore, a special burst form of PSC recordings during failure is presented. The latter is emitted when irregular longitudinal splitting is observed during failure.231 388