PSI - Issue 41

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 41 (2022) 452–460

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2 Guest Editors. Keywords: Acoustic Emissions; Pressure Stimulated Currents; Fracture; Alfas-stone. Abstract The investigatio of the mech nical status of materials subj cted to load evels appro ching thes cau ing macroscopic fracture s riously concerns the structural engineering community. T re are several experiment l works demonst ating a s ries of sensing techniques capable of providing indication warning about the upcoming catastrophic failure of the material. In the present w rk, beam-shaped Alfas-stone specimens were subjected to three-point ben ing until fracture. During loa ing he Acoustic Emissions (AE) and the Pressure Stimulated Currents (PSC) generated were record d. Correlation of coustic and elec ric signals is attempted aiming to enlighten the fracturing mechanisms activat d within the specimens. Sp cial at ention is paid to he very last instants b fore macroscop fracture. More ver, the role of the spe im ns’ porosity on th acoustic an electric activ ty is studied. The results show significant similarities of qualitative nature with corresponding experiments conducted on other building materials. © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) P er-review under responsibility of the MedFract2 Guest Editors. Keywords: Acoustic Emissions; Pressure Stimulated Currents; Fracture; Alfas-stone. 2nd Mediterranean Conference on Fracture and Structural Integrity Correlation of Acoustic Emissions and Pressure Stimulated Currents recorded in Alfas-stone specimens under three-point bending. The role of the specimens’ porosity: Preliminary results. G. Agalianos a , D. Tzagkarakis a , A. Loukidis a , E. D. Pasiou b , D. Triantis a , S. K. Kourkoulis b and I. Stavrakas a, * a University of West Attica, Department of Electrical & Electronics Engineering, Electronic Devices and Materials Laboratory, 250 Thivon Avenue, 122 44, Athens, Greece b National Technical University of Athens, School of Applied Mathematical and Physical Sciences, Department of Mechanics, Laboratory for Testing and Materials, Zografou Campus 157 73, Athens, Greece Abstract The investigation of the mechanical status of materials subjected to load levels approaching these causing macroscopic fracture seriously concerns the structural engineering community. There are several experimental works demonstrating a series of sensing techniques capable of providing indications warning about the upcoming catastrophic failure of the material. In the present work, beam-shaped Alfas-stone specimens were subjected to three-point bending until fracture. During loading the Acoustic Emissions (AE) and the Pressure Stimulated Currents (PSC) generated were recorded. Correlation of acoustic and electric signals is attempted aiming to enlighten the fracturing mechanisms activated within the specimens. Special attention is paid to the very last instants before macroscopic fracture. Moreover, the role of the specimens’ porosity on the acoustic and electric activity is studied. The results show significant similarities of qualitative nature with corresponding experiments conducted on other building materials. 2nd Mediterranean Conference on Fracture and Structural Integrity Correlation of Acoustic Emissions and Pressure Stimulated Currents recorded in Alfas-stone specimens under three-point bending. The role of the specimens’ porosity: Preliminary results. G. Agalianos a , D. Tzagkarakis a , A. Loukidis a , E. D. Pasiou b , D. Triantis a , S. K. Kourkoulis b and I. Stavrakas a, * a University of West Attica, Department of Electrical & Electronics Engineering, Electronic Devices and Materials Laboratory, 250 Thivon Avenue, 122 44, Athens, Greece b National Technical University of Athen , School of Applied Mathematic l and Physical Scie ces, Department of Mechanics, Laboratory for Testing and Materials, Zografou Campus 157 73, Athens, Greece

* Corresponding author. Tel.: +30-210-5387209. E-mail address: ilias@uniwa.gr * Corresponding author. Tel.: +30-210-5387209. E-mail address: ilias@uniwa.gr

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2 Guest Editors. 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an ope access article under t CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2 Guest Editors.

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.051