Electromagnetic emission from magnetite plate cracking under seismic processes

Koshevaya, S.; Grimalsky, V.; Makarets, N. V.; Kotsarenko, A.; Siquieros-Alatorre, J.; Pérez-Enríquez, R.; Juárez-Romero, D.

doi:10.5194/adgeo-14-25-2008

Cited by 6 publications

(14 citation statements)

References 7 publications

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“…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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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: 99%

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

et al. 2014

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“…Therefore, it is possible to ignore the boundary conditions for the EM field and mechanical strains, considering the medium as unbounded, although it is assumed that a piezoeffective inclusion of size L is placed inside the plate ( Fig. 1) (Gernets et al 2004;Koshevaya et al 2008). Then the equations of motion of the medium and the equations of the EM field, written in the crystallographic frame of the piezocrystal in SI units, take the following form:…”

Section: Model and Basic Equationsmentioning

confidence: 99%

“…1 and 2 are dimensionless, while the others have proper SI units. Equations 1 and 2 have been solved by using a Fourier transform of the spatial coordinates with infinite limits and a Laplace transform with respect to time t (Gernets et al 2004;Koshevaya et al 2008).…”

Section: Model and Basic Equationsmentioning

confidence: 99%

“…Electromagnetic emission (EME) caused by fracturing of crystals in plates has been studied theoretically (Surkov et al 2003;Gernets et al 2004;Koshevaya et al 2008). In Grimalsky et al (2004), the theory was used to explain events for Jupiter, providing a good test of such calculations for other phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis model, in particular in piezocrystals (Gernets, et al 2004;Koshevaya et al 2008), has been considered with finite size and a uniformly moving crack with its linear front parallel to the optical axis of the crystal. The crack tip instantly begins uniform motion at time t = 0 and stops at time t = T [ 0.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of explosions and seismic phenomena based on electromagnetic cracking of piezoelectric and piezomagnetic plates

Koshevaya¹,

Makarets

Kotsarenko

et al. 2011

Nat Hazards

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Electromagnetic emission caused by fracturing of piezoelectric and piezomagnetic crystals in plates and its application for remote sensing of explosions and natural seismic and volcanic phenomena were studied theoretically. The difference of emission from piezoelectric and piezomagnetic plates in cases of explosions versus seismic and volcanic phenomena enables use of this analysis method for phenomenon identification. The analysis herein is based on a model of a plate of finite size with a uniformly moving crack. It has been demonstrated that time-dependent mechanical stresses, which exist in the vicinity of the crack apex, are sources of an alternating electromagnetic field. The nonstationary mechanical stresses in the vicinity of the moving crack cause nonstationary polarization currents, which include both potential and vortical components in the case of a piezoelectric crystal but only the vortical component in the case of a piezomagnetic crystal. In both cases, it is possible to observe the nonstationary magnetic dipole which is the source of the excited magnetic field in the near zone. Such a dipole is created due to the motion of the crack apex and depends on the specific crystalline symmetry. Comparison of the two types of crystal (piezoelectric and piezomagnetic) shows that emission from the piezomagnetic crystal is more effective. A very important result is that it is possible to observe the difference between seismic and volcanic versus industrial phenomena through analysis of the unloading wave, which is absent in the case of industrial phenomena. This opens the possibility to identify the type of disaster and take the correct decision.

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Determination of Crack Surface Orientation in Carbon Fibre Reinforced Polymers by Measuring Electromagnetic Emission

2017

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Electromagnetic emission (EME) generated by fracture of carbon fibre reinforced polymers (CFRP) is studied. The fracture is induced to cross-ply CFRP by mechanical loading in a three-point bending configuration. An EME acquisition setup operating on the principle of capacitive coupling is used to measure the low frequency (kHz-MHz range) electric field whose generation is attributed to the charge redistribution accompanying the fracture processes. Multiple, differently oriented EME sensors, for the simultaneous EME measurement with different source-sensor orientations, were applied to account for the directionality of the EME sources and their generated electric fields. A method to deduce the crack orientation based on the emitted EME field's directionality is proposed. A comparison between the angles of the EME sources obtained by this method and the actual crack surface orientations as determined by computed tomography is made.

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Electromagnetic emission from magnetite plate cracking under seismic processes

Cited by 6 publications

References 7 publications

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

Relation of Electromagnetic Emission and Crack Dynamics in Epoxy Resin Materials

Analysis of explosions and seismic phenomena based on electromagnetic cracking of piezoelectric and piezomagnetic plates

Determination of Crack Surface Orientation in Carbon Fibre Reinforced Polymers by Measuring Electromagnetic Emission

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