Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept
The acoustic activity developed in marble specimens under various loading schemes is explored in terms of the recently introduced <i>F</i>-function. The novelty of the study is that instead of describing the temporal evolution of the <i>F</i>-function in terms of conventional...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/1/231 |
| _version_ | 1797499621978669056 |
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| author | Andronikos Loukidis Dimos Triantis Ilias Stavrakas Ermioni D. Pasiou Stavros K. Kourkoulis |
| author_facet | Andronikos Loukidis Dimos Triantis Ilias Stavrakas Ermioni D. Pasiou Stavros K. Kourkoulis |
| author_sort | Andronikos Loukidis |
| collection | DOAJ |
| description | The acoustic activity developed in marble specimens under various loading schemes is explored in terms of the recently introduced <i>F</i>-function. The novelty of the study is that instead of describing the temporal evolution of the <i>F</i>-function in terms of conventional time, the Natural Time concept is employed. Although completely different geometries and loading schemes were considered, the evolution of the <i>F</i>-function in the Natural Time domain exhibits a self-consistent motive: its values increase progressively with fluctuations of varying intensity, however, while the fracture is approaching, a power law appears to systematically govern the response of the specimen/structure loaded. The exponent of this law, somehow corresponding to the intensity of the acoustic activity within the loaded complex, varies within broad limits. The onset of validity of the power law designates that the system has entered into its critical stage, namely that of impending fracture, providing a useful pre-failure signal. |
| first_indexed | 2024-03-10T03:50:02Z |
| format | Article |
| id | doaj.art-2f76a19d5d6748b7b8738a9989c7fcdb |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:50:02Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-2f76a19d5d6748b7b8738a9989c7fcdb2023-11-23T11:09:43ZengMDPI AGApplied Sciences2076-34172021-12-0112123110.3390/app12010231Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” ConceptAndronikos Loukidis0Dimos Triantis1Ilias Stavrakas2Ermioni D. Pasiou3Stavros K. Kourkoulis4Electronic Devices and Materials Laboratory, Department of Electrical & Electronics Engineering, University of West Attica, 250 Thivon Avenue, 122 44 Athens, GreeceElectronic Devices and Materials Laboratory, Department of Electrical & Electronics Engineering, University of West Attica, 250 Thivon Avenue, 122 44 Athens, GreeceElectronic Devices and Materials Laboratory, Department of Electrical & Electronics Engineering, University of West Attica, 250 Thivon Avenue, 122 44 Athens, GreeceLaboratory for Testing and Materials, Department of Mechanics, School of Applied Mathematical and Physical Sciences, Zografou Campus, National Technical University of Athens, 157 73 Athens, GreeceLaboratory for Testing and Materials, Department of Mechanics, School of Applied Mathematical and Physical Sciences, Zografou Campus, National Technical University of Athens, 157 73 Athens, GreeceThe acoustic activity developed in marble specimens under various loading schemes is explored in terms of the recently introduced <i>F</i>-function. The novelty of the study is that instead of describing the temporal evolution of the <i>F</i>-function in terms of conventional time, the Natural Time concept is employed. Although completely different geometries and loading schemes were considered, the evolution of the <i>F</i>-function in the Natural Time domain exhibits a self-consistent motive: its values increase progressively with fluctuations of varying intensity, however, while the fracture is approaching, a power law appears to systematically govern the response of the specimen/structure loaded. The exponent of this law, somehow corresponding to the intensity of the acoustic activity within the loaded complex, varies within broad limits. The onset of validity of the power law designates that the system has entered into its critical stage, namely that of impending fracture, providing a useful pre-failure signal.https://www.mdpi.com/2076-3417/12/1/231acoustic emissionsnatural timepre-failure indicatorsmarble<i>F</i>-function |
| spellingShingle | Andronikos Loukidis Dimos Triantis Ilias Stavrakas Ermioni D. Pasiou Stavros K. Kourkoulis Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept Applied Sciences acoustic emissions natural time pre-failure indicators marble <i>F</i>-function |
| title | Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept |
| title_full | Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept |
| title_fullStr | Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept |
| title_full_unstemmed | Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept |
| title_short | Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept |
| title_sort | detecting criticality by exploring the acoustic activity in terms of the natural time concept |
| topic | acoustic emissions natural time pre-failure indicators marble <i>F</i>-function |
| url | https://www.mdpi.com/2076-3417/12/1/231 |
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