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Using AC Conductivity Measurements to Study the Influence of Mechanical Stress on the Strength of Geomaterials

Open Journal of Applied Sciences 2012年第2期2卷 61-65页

作者： ilias stavrakas Kostantinos Moutzouris Kostantinos Ninos Nikos Mitritsakis Zacharias Agioutantis Dimos Triantis Department of Electronics Technological Educational Institute of Athens Athens Greece Department of Mineral Resources Engineering Technical University of Crete Chania Greece

The Dielectric Spectroscopy technique is a tool that can be used to provide information regarding the physical and chemical properties of materials. In this work Dielectric Spectroscopy (DS) measurements were conducted on marble specimens that were previously subjected to uniaxial compressive stress up to fracture in order to investigate the influence of the mechanical stress on the dielectric properties of the specimens. Specifically, the ac conductivity (σac) was measured when an ac electric field in the frequency range 1 kHz - 1 MHz was applied upon dry and saturated specimens which were subjected successively to higher levels of mechanical stress. The experimental results indicate that there are systematic variations in the values of the ac conductivity after each stress application at a higher stress level. Such variations become more intense at higher stress values and can be used to indicate the upcoming fracture since significant increase of conductivity is recorded when microcracks formations appear and propagate in the sample bulk.

关键词： AC Conductivity Measurements Marble Mechanical Load

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Nondestructive Testing Electrical Methods for Sensing Damages in Cement Mortar Beams

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Open Journal of Applied Sciences 2013年第1期3卷 50-55页

作者： Charalampos Stergiopoulos ilias stavrakas George Hloupis Antonios Kyriazopoulos Dimos Triantis Cimon Anastasiadis John Stonham Department of Electronics Technological Educational Institute of Athens Athens Greece School of Engineering and Design Brunel University Brunel United Kingdom

This paper discusses the experimental results of concurrently measured Electrical and Acoustic Emissions in order to evaluate the mechanical health status of cement mortar beams subjected to three-point bending mechanical tests. In particular, the Electrical Resistance and the Electrical Current emissions are recorded concurrent with Acoustic Emissions and the experimental results are discussed under the concept of crack initiation and propagation processes. For the first time, the electrodes that are used for conducting the measurements are placed in the bulk of the specimen, near the tensile zone, during its preparation. The damage evolution is examined by monitoring the fractional change of the Electrical Resistance and the variation of the Electrical Current in combination with the Acoustic Emission recordings.

关键词： Non-Destructive Testing Electrical Resistance Acoustic and Electrical Current Emissions Cement

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