Hidden Affinities Between Electric and Acoustic Activities in Brittle Materials at Near-Fracture Load Levels

Triantis, Dimos; Pasiou, Ermioni D.; Kourkoulis, Stavros K.

doi:10.1007/s00603-021-02711-9

Cited by 32 publications

(24 citation statements)

References 47 publications

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“…The existence of the power law is indicative of a system's entrance into criticality. Therefore, the fact that a power law firstly emerges from the PSC signal recorded by the sensor closer to the notch from which the catastrophic fracture started, is in full accordance with previously reported results [9,18,69].…”

Section: Direct Tension Of Symmetrically Notched Marble Platessupporting

confidence: 92%

“…The PSC technique is nowadays broadly applied, both according to the originally introduced form [60][61][62][63][64] or according to various modified forms [65][66][67][68], providing a flexible (relatively simple and cheap) tool for monitoring internal damage processes in mechanically loaded specimens. The temporal evolution of the PSC, during loading of specimens or structural elements made of brittle materials, provides interesting pre-failure indicators, in good qualitative agreement with the indicators provided by the analysis of the acoustic data [9,18,69].…”

Section: Elaborating the Data Concerning The Acoustic And Electric Emissionssupporting

confidence: 71%

“…The proper interpretation of the data acquired by these sensing techniques, in the direction of revealing hidden pre-failure indicators, is among the challenges of the current scientific research [8,9]. Various approaches have been proposed to analyze the experimental data, such as the b-value analysis [10,11], models based on wavelets [12,13] and natural time (NT) [14,15], analyses based on non-extensive statistical physics (NESP) [16,17], power-law models [18,19] etc.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Assessment of Criticality Indices Extracted from Acoustic and Electrical Signals Detected in Marble Specimens

et al. 2022

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The quantitative determination of the current load carrying capability of already loaded structural elements and the possibility to detect proper indices that could be considered as signals for timely warning that the load carrying capacity is exhausted is the subject of this study. More specifically, it aims to explore the possibility of detecting signals that can be considered as indices warning about upcoming fracture and then to compare quantitatively such signals provided by different techniques. The novelty of the present study lies exactly in this quantitative comparison of the pre-failure signals provided by various sensing techniques and various methods of analysis of the experimental data. To achieve this target, advantage is taken of data concerning the acoustic and electrical activities produced while marble specimens are subjected to mechanical loading. The respective signals are detected and recorded by means of the acoustic emissions technique and that of the pressure stimulated currents. The signals detected by the acoustic emissions technique are analyzed in terms of three formulations, i.e., the b-value, the F-function and the parameters variance κ1, entropy S and entropy under time reversal S_ according to the natural time analysis. The signals detected by the pressure stimulated currents technique are analyzed by means of the intensity of the electric current recorded. The study indicates that all quantities considered provide promising pre-failure indicators. Furthermore, when the specimen is subjected to near-to-failure load levels, the temporal evolution of three of the quantities studied (b-value, F-function, pressure stimulated currents) is governed by a specific power law. The onset of validity of this law designates some differentiation of the damage mechanisms activated. Quantitative differences are observed between the time instants at which this power law starts dictating the evolution of the above parameters, indicating the imperative need for further investigation, despite the quite encouraging results of the present study.

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Section: Direct Tension Of Symmetrically Notched Marble Platessupporting

confidence: 92%

Section: Elaborating the Data Concerning The Acoustic And Electric Emissionssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Comparative Assessment of Criticality Indices Extracted from Acoustic and Electrical Signals Detected in Marble Specimens

et al. 2022

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“…According to the influential work of Bak et al (1987) [21], various complex systems, operating far from their thermodynamic equilibrium, will be spontaneously organized under their natural evolution (and without the need of an external intervention), into a critical boundary state which resides at the transition point between the equilibrium and non-equilibrium states. During this phase transition, the appearance of power (or approximately power) laws has been extensively reported in the literature [9,19].…”

Section: Introductionmentioning

confidence: 90%

“…In general, the exponent m characterizes the intensity of the rate of production of acoustic hits/events just before fracture. Moreover, it has been experimentally verified [19,20] that the temporal evolution of the F-function provides indices that could be safely considered as pre-failure signals.…”

Section: Introductionmentioning

confidence: 96%

Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept

et al. 2021

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The acoustic activity developed in marble specimens under various loading schemes is explored in terms of the recently introduced F-function. The novelty of the study is that instead of describing the temporal evolution of the F-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 F-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.

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Characterization and Correlation of Rock Fracture-Induced Electrical Resistance and Acoustic Emission

Mingyang

Liu

et al. 2023

Rock Mech Rock Eng

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Hidden Affinities Between Electric and Acoustic Activities in Brittle Materials at Near-Fracture Load Levels

Cited by 32 publications

References 47 publications

Comparative Assessment of Criticality Indices Extracted from Acoustic and Electrical Signals Detected in Marble Specimens

Comparative Assessment of Criticality Indices Extracted from Acoustic and Electrical Signals Detected in Marble Specimens

Detecting Criticality by Exploring the Acoustic Activity in Terms of the “Natural-Time” Concept

Characterization and Correlation of Rock Fracture-Induced Electrical Resistance and Acoustic Emission

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