PSI - Issue 55

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 55 (2024) 185–192

© 2024 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 ESICC 2023 Organizers Abstract The acoustic activity generated in marble specimens under elementary loading schemes (direct tension and uniaxial compression) is studied in terms of the average energy of the acoustic signals recorded. It is highlighted that several seconds before the macro scopic disintegration of the specimens the temporal variation of the specific quantity exhibits a clear plateau, which is terminated just a few tenths of a second before fracture. The specific conclusion is verified by considering the temporal variation of the average energy of the acoustic events against the respective variation of the Pressure Stimulated Currents produced while a restored marble epistyle of the Parthenon Temple is loaded under multi-point bending. It is thus safely stated that the onset of the specific plateau can be considered as an interesting pre-failure signal warning about entrance of the system into its critical stage. © 2024 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 ESICC 2023 Organizers. Keywords: Structural Health M ο nitoring; Cultural Heritage; Restoration and Conservation; Acoustic Emisions; Energy of the Acosutic Signals 1. Introduction From the structural engineering point of view, the critical issue while restoring monuments of unique splendor of the cultural heritage is that of the structural integrity (keeping, of course, in mind that any intervention is to be restricted Abstract The acoustic activity generated in marble specimens under elementary loading schemes (direct tension and uniaxial compression) is studied in terms of the average energy of the acoustic signals recorded. It is highlighted that several seconds before the macro scopic disintegration of the specimens the temporal variation of the specific quantity exhibits a clear plateau, which is terminated just a few tenths of a second before fracture. The specific conclusion is verified by considering the temporal variation of the average energy of the acoustic events against the respective variation of the Pressure Stimulated Currents produced while a restored marble epistyle of the Parthenon Temple is loaded under multi-point bending. It is thus safely stated that the onset of the specific plateau can be considered as an interesting pre-failure signal warning about entrance of the system into its critical stage. © 2024 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 ESICC 2023 Organizers. Keywords: Structural Health M ο nitoring; Cultural Heritage; Restoration and Conservation; Acoustic Emisions; Energy of the Acosutic Signals 1. Introduction From the structural engineering point of view, the critical issue while restoring monuments of unique splendor of the cultural heritage is that of the structural integrity (keeping, of course, in mind that any intervention is to be restricted ESICC 2023 – Energy efficiency, Structural Integrity in historical and modern buildings facing Climate change and Circularity ESICC 2023 – Energy efficiency, Structural Integrity in historical and modern buildings facing Climate change and Circularity New perspectives in Structural Health Monitoring of restored elements of cultural heritage monuments Dimos Triantis (a) , Ermioni D. Pasiou (b) , Ilias Stavrakas (a) , Stavros K. Kourkoulis* (b) a National Technical University of Athens, School of Applied Mathematical and Physical Sciences, Department of Mechanics, Laboratory for Testing and Materials, Theocaris Building, Zografou Campus, 157 73, Greece b University of West Attica, School of Engineering, Department of Electrical & Electronics Engineering, Electronic Devices and Materials Laboratory, 250 Thivon Avenue, 122 44, Athens, Greece New perspectives in Structural Health Monitoring of restored elements of cultural heritage monuments Dimos Triantis (a) , Ermioni D. Pasiou (b) , Ilias Stavrakas (a) , Stavros K. Kourkoulis* (b) a National Technical University of Athens, School of Applied Mathematical and Physical Sciences, Department of Mechanics, Laboratory for Testing and Materials, Theocaris Building, Zografou Campus, 157 73, Greece b University of West Attica, School of Engineering, Department of Electrical & Electronics Engineering, Electronic Devices and Materials Laboratory, 250 Thivon Avenue, 122 44, Athens, Greece

* Corresponding author. Tel.: +30 210 7721263; fax: +210 7721301. E-mail address: stakkour@central.ntua.gr * Corresponding author. Tel.: +30 210 7721263; fax: +210 7721301. E-mail address: stakkour@central.ntua.gr

2452-3216 © 2024 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 ESICC 2023 Organizers 2452-3216 © 2024 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 ESICC 2023 Organizers

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