Issue 40

E. D. Pasiou et alii, Frattura ed Integrità Strutturale, 40 (2017) 41-51; DOI: 10.3221/IGF-ESIS.40.04 41 Focussed on Recent advances in “Experimental Mechanics of Materials” in Greece Correlation between the electric and acoustic signals emitted during compression of brittle materials Ermioni D. Pasiou National Technical University of Athens, Department of Mechanics, Laboratory for Testing and Materials, 5 Heroes of Polytechnion Avenue, Theocaris Building, 157 73, Athens, Greece epasiou@teemail.gr Dimos Triantis Technological Educational Institution of Athens, Department of Electronics, Laboratory of Electronic Devices and Materials, Ag. Spiridonos Street, 122 10, Athens, Greece triantis@teiath.gr A BSTRACT . An experimental protocol is described including a series of uni- axial compression tests of three brittle materials (marble, mortar and glass). The Acoustic Emission (AE) technique and the Pressure Stimulated Currents (PSC) one are used since the recordings of both techniques are strongly related to the formation of cracking in brittle materials. In the present paper, the correlation of these techniques is investigated, which is finally proven to be very satisfactory. K EYWORDS . Pressure stimulated currents (PSC); Acoustic emission (AE); Compression; Brittle materials. Citation: Pasiou, E.D., Triantis, D., Correla- tion between the electric and acoustic signals emitted during compression of brittle ma- terials, Frattura ed Integrità Strutturale, 40 (2017) 41-51. Received: 23.12.2016 Accepted: 07.02.2017 Published: 01.04.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION onitoring the mechanical response of various brittle materials under compressive loading is of great interest in a range of application fields. Especially, monitoring their damage evolution is crucial since actions can be taken in time in order to preserve the integrity of structures. In this context, a series of diagnostic methods have been developed in order to assess damage and also to detect impending failure of the materials. Acoustic emission (AE) technique is among the as above techniques [1]. When a material is loaded, transient elastic waves are generated within the material (which are mainly depended on the material’s irreversible deformations) and travel along the specimen. These waves are called acoustic emissions and they are recorded by sensors which are attached on the specimen. The first studies of acoustic emissions in geomaterials were carried out in 1938. Monitoring a specimen/ structure during its whole loading history is one of the advantages of this technique since in general the increase of acoustic activity, which is observed as the specimen approaches failure, is strongly correlated to the decay of the M