Acoustic and Electromagnetic Emissions as Precursor Phenomena in Failure Processes

Lacidogna, Giuseppe; Carpinteri, Alberto; Manuello, A.; Durin, Gianfranco; Schiavi, Alessandro; Niccolini, Gianni; Agosto, A.

doi:10.1111/j.1475-1305.2010.00750.x

Cited by 117 publications

(62 citation statements)

References 30 publications

(51 reference statements)

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“…Some authors attribute the dynamics to the mechanical vibration of the crack surface [1,3]. In contrast, Frid et al and Rabinovitch et al suggest to describe EME in the form of charge surface vibrational waves [2,4,10]. Also there are still inconsistencies of the proposed models and experimental results, e.g.…”

Section: Introductionmentioning

confidence: 84%

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Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

et al. 2014

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Electromagnetic emission (EME) testing and acoustic emission (AE) testing are applied to investigate the failure of a brittle, dielectric material under mechanical load. A setup for three point flexure tests comprising simultaneous monitoring of EME and AE was used to induce fracture of epoxy resin specimens. The influences of the orientation and the distance of the crack surface on the detectable EME signals are the subjects of investigation. As EME sensor a capacitive sensor was used. Tests with an artificial test source are carried out to characterize the system response of the sensor, the attached amplifier and acquisition cards as well as the included bandpass filters. We propose an EME source based on the surface charge density modelled at the position of the fracture plane. Results of finite element method modelling of the EME source are compared to experimental results and show very good agreement. The experimental results show a clear directional character of the emitted electromagnetic field and a strong dependence of the detected signals amplitude on sourcesensor distance. A significant influence of the measurement chain on the detected electromagnetic signals bandwidth was found. Furthermore it is shown that the electromagnetic signals consist of three contributions originating from different source mechanisms. These are attributed to the separation and

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Section: Introductionmentioning

confidence: 84%

“…The occurrence of this electromagnetic emission (EME) has been shown for almost any material and for various kinds of failure mechanisms [1][2][3][4][5][6][7][8][9]. The detection and analysis of EME can help to understand the complex processes of crack formation.…”

Section: Introductionmentioning

confidence: 99%

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

et al. 2014

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“…В дальнейших работах будут изложены материалы исследования и подробно будет изложено развитие ма-гистральной трещины в области растягивающих напря-жений при применении метода акустико-эмиссионного прогнозирования механического разрушения и ки-нетическая модель микротрещинообразования твeрдых тел [81][82][83][84][85][86][87][88][89][90][91] с одновременной регистрацией электроста-тических полей [92][93][94][95][96][97].…”

Section: механизмы развития магистральных трещинunclassified

Термокинетическая Модель Разрушения Гетерогенных Материалов И Особенности Ее Численной Реализации При Воздействии Высокочастотными Электромагнитными Полями

Менжулин¹,

Махмудов²

2017

Журнал Технической Физики

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“…EM emissions in a wide frequency spectrum ranging from kHz to MHz are produced by opening cracks, which can be considered as the so-called precursors of general fracture. The radiated EM precursors are detectable both at a laboratory [8][9][10][11][12][13][14][15][16] and geological scale .…”

Section: Introductionmentioning

confidence: 99%

“…The radiated EM precursors are detectable both at a laboratory [8][9][10][11][12][13][14][15][16] and geological scale .Data collection: Since 1994, a station has been installed and operated at a mountainous site of Zante island (37.76 o N − 20.76 o E) in the Ionian Sea (western Greece). The main aim of this station is the detection of kHz-MHz EM precursors.…”

mentioning

confidence: 99%

Are There Pre-Seismic Electromagnetic Precursors? A Multidisciplinary Approach

Eftaxias¹

2012

Earthquake Research and Analysis - Statistical Studies, Observations and Planning

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11www.intechopen.com 2 Will-be-set-by-IN-TECH spectrum ranging from kHz to MHz are produced by opening cracks, which can be considered as the so-called precursors of general fracture. The radiated EM precursors are detectable both at a laboratory [8][9][10][11][12][13][14][15][16] and geological scale .Data collection: Since 1994, a station has been installed and operated at a mountainous site of Zante island (37.76 o N − 20.76 o E) in the Ionian Sea (western Greece). The main aim of this station is the detection of kHz-MHz EM precursors. Six loop antennas detect the three components (EW, NS, and vertical) of the variations of the magnetic field at 3 kHz and 10 kHz respectively; three vertical λ/2 electric dipoles detect the electric field variations at 41, 54 MHz, and 135 MHz respectively. These frequencies were selected in order to minimize the effects of the sources of man-made noise in the mountain area of the Zante Island. Moreover, two Short Thin Wire Antennas, oriented at EW and NS directions of length of 100 m, respectively, have been also installed. The aim of the last installation is the detection of ultra-low-frequency (< 1Hz) EM precursors rooted in a preseismic lithosphere-atmosphere-ionosphere-coupling. All the EM time series were sampled at 1 Hz. Such an experimental setup helps to specify not only whether or not a single EM anomaly is preseismic in itself, but also whether a sequence of EM disturbances at different frequencies, which are emerged one after the other in a short time period, could be characterized as preseismic one. Clear such EM precursors have been detected over periods ranging from approximately a week to a few hours prior to catastrophic EQs that occurred in Greece or Italy (e.g., [21,22,[25][26][27][28][29][30][31][32][33][34][35][36][37]). We emphasize that the detected precursors were associated with EQs: (i) occurred in land (or near coast-line); (ii) were strong, i.e., with magnitude 6 or larger; and (iii) were shallow. Recent results indicate that the recorded EM precursors contain information characteristic of an ensuing seismic event (e.g., [21,22,[25][26][27][28][29][30][31][32][33][34][35][36][37]).An important feature, observed both at laboratory and geophysical scale, is that it the MHz radiation precedes the kHz one [25,[27][28][29]35,36]. Studies on the small (laboratory) scale reveal that the kHz EM emission is launched in the tail of pre-fracture EM emission from 97% up to 100% of the corresponding failure strength [25 and references therein]. At the geophysical scale the kHz EM precursors are emerged from a few days up to a few hours before the EQ occurrence. The association of MHz, kHz EM precursors with the last stages of EQ generation is justified.The origin of EM emissions. The origin of EM emissions from fracture is not completely clear, and different attempts have been made in order to explain it [8, 32 and references therein]. A relevant attempt is related to the "capacitor model" [32]. In many materials, emission of photons, electrons, ions and neutral p...

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Acoustic and Electromagnetic Emissions as Precursor Phenomena in Failure Processes

Cited by 117 publications

References 30 publications

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

Термокинетическая Модель Разрушения Гетерогенных Материалов И Особенности Ее Численной Реализации При Воздействии Высокочастотными Электромагнитными Полями

Are There Pre-Seismic Electromagnetic Precursors? A Multidisciplinary Approach

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