Search Results - "Stavrakas, I."

Hidden Affinities Between Electric and Acoustic Activities in Brittle Materials at Near-Fracture Load Levels by Triantis, D., Pasiou, E. D., Stavrakas, I., Kourkoulis, S. K.

“…The time evolution of the electric activity in brittle materials, mechanically loaded at levels approaching the ones causing catastrophic fracture, is studied…”
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Notched marble plates under direct tension: Mechanical response and fracture by Kourkoulis, S.K., Pasiou, E.D., Dakanali, I., Stavrakas, I., Triantis, D.

“…•Direct tension, bending and Brazilian tests provide different tensile strength.•The axial stress-strain curve of Dionysos marble strongly deviates from…”
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Predicting fracture of mortar beams under three-point bending using non-extensive statistical modeling of electric emissions by Stergiopoulos, Ch, Stavrakas, I., Triantis, D., Vallianatos, F., Stonham, J.

“…Weak electric signals termed as “Pressure Stimulated Currents, PSC” are generated and detected while cement based materials are found under mechanical load,…”
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Notched marble plates under tension: Detecting prefailure indicators and predicting entrance to the “critical stage” by Kourkoulis, S.K., Pasiou, E.D., Dakanali, I., Stavrakas, I., Triantis, D.

“…The potentialities of the pressure stimulated currents technique to be used as a continuous structural health monitoring tool in applications related to stone…”
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Pressure stimulated electrical emissions from cement mortar used as failure predictors by Triantis, D., Stavrakas, I., Kyriazopoulos, A., Hloupis, G., Agioutantis, Z.

“…The electrical signals emitted during the application of uniaxial compressive mechanical stress upon cement mortar specimens are observed and discussed in this…”
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Marble epistyles under shear: An experimental study of the role of “Relieving Space” by Pasiou, E. D., Stavrakas, I., Triantis, D., Kourkoulis, S. K.

“…The mechanical response of mutually interconnected epistyles is studied experimentally. The specimens are made of two marble blocks connected to each other…”
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Acoustic Emission Analysis of Cement Mortar Specimens During Three Point Bending Tests by Stavrakas, I., Triantis, D., Kourkoulis, S.K., Pasiou, E.D., Dakanali, I.

“…Abstract This work discusses the experimental results of Acoustic Emission (AE) recordings during repetitive loading/unloading loops of cement mortar beams…”
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The correlation of electrical charge with strain on stressed rock samples by Triantis, D., Anastasiadis, C., Stavrakas, I.

“…Laboratory experiments on rock samples have shown electric signal emissions when the samples are subjected to temporal stress increase especially when the…”
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Interface states and MWS polarization contributions to the dielectric response of low voltage ZnO varistor by Tsonos, C., Kanapitsas, A., Triantis, D., Anastasiadis, C., Stavrakas, I., Pissis, P., Neagu, E.

“…The main purpose of this work is to study the dielectric response of commercial low voltage ZnO varistors by means of dielectric relaxation spectroscopy (DRS)…”
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Temperature-dependent refractive index of potassium acid phthalate (KAP) in the visible and near-infrared by Moutzouris, K., Stavrakas, I., Triantis, D., Enculescu, M.

“…► KAP crystal refractive index measurements at temperatures up to 200 °C are reported. ► Temperature-dependent dispersion relations are proposed. ►…”
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An analysis of pressure stimulated currents (PSC), in marble samples under mechanical stress by Triantis, D., Stavrakas, I., Anastasiadis, C., Kyriazopoulos, A., Vallianatos, F.

“…The pressure stimulated current (PSC) technique was used in two variations, LSRT and SST for the investigation of the relations governing stress rate d S/d t,…”
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Piezo stimulated currents in marble samples: precursory and concurrent-with-failure signals by Stavrakas, I., Anastasiadis, C., Triantis, D., Vallianatos, F.

“…The Earth’s electric field transient variations are promising candidates of earthquake precursors. In order to study the physical mechanisms of such precursory…”
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Probing the microstructure of cement mortars through dielectric parameters’ variation by Tsonos, C., Stavrakas, I., Anastasiadis, C., Kyriazopoulos, A., Kanapitsas, A., Triantis, D.

“…The present work deals with the electrical properties of typical cement mortars during the hardening process, cured at low relative humidity. Measurements were…”
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Isothermal depolarization currents measurements of cement mortar during the hardening process. Commentaries on previous work by Tsonos, C., Stavrakas, I., Anastasiadis, C., Kyriazopoulos, A., Kanapitsas, A., Triantis, D.

“…In this short paper the experimental results after the application of the Isothermal Depolarization Current Technique on cement mortar samples during the…”
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Pressure stimulated currents in rocks and their correlation with mechanical properties by Stavrakas, I., Triantis, D., Agioutantis, Z., Maurigiannakis, S., Saltas, V., Vallianatos, F., Clarke, M.

“…The spontaneous electrification of marble samples was studied while they were subjected to uniaxial stress. The Pressure Stimulated Current (PSC) technique was…”
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Thermally activated conduction mechanisms in Silicon Nitride MIS structures by Kanapitsas, A., Tsonos, C., Triantis, D., Stavrakas, I., Anastasiadis, C., Photopoulos, P., Pissis, P., Em. Vamvakas, V.

“…This publication reports on thermally activated currents in n-silicon/Si 3N 4/Al structures. The samples prepared were examined by means of I–V, C–V, ac…”
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Study of directivity effect on electromagnetic emissions in the HF band as earthquake precursors: Preliminary results on field observations by Stavrakas, I., Clarke, M., Koulouras, G., Stavrakakis, G., Nomicos, C.

“…This work focuses on the use of electromagnetic emissions (EM) in the HF band as a warning event for earthquakes. EM at HF components 41 MHz and 46 MHz were…”
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The influence of externally applied uniaxial stress on Isothermal Depolarization Current mechanisms in rock samples by STAVRAKAS, I, TRIANTIS, D, ANASTASIADIS, C

“…The technique of Isothermal Depolarization Currents (IDC) was applied on marbles collected from Mt. Penteli (Greece) in order to investigate the influence of…”
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Non-extensive statistical analysis of acoustic emissions series recorded during the uniaxial compression of brittle rocks by Saltas, V., Vallianatos, F., Triantis, D., Koumoudeli, T., Stavrakas, I.

“…Non-extensive statistical physics (NESP) provides the theoretical tool to investigate complex systems that appear in different length-scales and violate the…”
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Electrical and Acoustic Emissions in cement mortar beams subjected to mechanical loading up to fracture by Stergiopoulos, C., Stavrakas, I., Hloupis, G., Triantis, D., Vallianatos, F.

“…•We conducted Three Point Bending tests on cement mortar beams.•We recorded Electrical and Acoustic Emission events simultaneously.•Electrical Emission peaks…”
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