Electric current generation associated with the deformation rate of a solid: Preseismic and coseismic signals

Vallianatos, Filippos; Tzanis, A.

doi:10.1016/s0079-1946(98)00122-0

Cited by 90 publications

(43 citation statements)

References 11 publications

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“…The motion of charged dislocations (MCD) [8][9][10][11] is one of the basic mechanisms involved in such electrification phenomena but the contribution of these effects cannot be determined individually. The mechanisms interact in a way that is dependent on the material and its mechanical stress history, as well as on its mechanical state.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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This paper introduces the possibility of in-situ assessment of loading and remaining strength in concrete structures by means of measuring discharge of electric current from loaded specimens.The paper demonstrates that the techniques have been applied to other rock-like materials, but that for the first time they are applied to cement based materials and a theoretical model is proposed in relation to the appearance of electrical signals during sample loading and up to fracture.A series of laboratory experiments on cement mortar specimens in simple uniaxial compression, and subsequently in bending -hence displaying both tension and compression -are described and show clear correlations between resulting strains and currents measured. Under uniaxial loading there is a well-defined relationship between the pressure-stimulated current (PSC) as a result of a monotonic mechanical loading regime.Similar results are observed in the three-point bending tests where a range of loading regimes is studied, including stepped changes in loading.While currents can be measured at low strains, best results seem to be obtained when strains approach and exceed yield stress values.This technique clearly has immense potential for structural health monitoring of cementbased structures. Both intermittent and continuous monitoring becomes possible, and given an ongoing campaign of monitoring, remaining strength can be estimated.

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Section: Introductionmentioning

confidence: 99%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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“…Correspondence to: F. Vallianatos (fvallian@chania.teicrete.gr) the theory of propagating cracks (Teisseyre and Nagahama, 1999;Vallianatos and Tzanis, 1998). Initially, there is a rapid rise in the number of propagating cracks, which creates a transient electric field.…”

Section: Introductionmentioning

confidence: 99%

A neuro-fuzzy approach to the reliable recognition of electric earthquake precursors

Konstantaras

Varley

Vallianatos

et al. 2004

Nat. Hazards Earth Syst. Sci.

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Abstract. Electric Earthquake Precursor (EEP) recognition is essentially a problem of weak signal detection. An EEP signal, according to the theory of propagating cracks, is usually a very weak electric potential anomaly appearing on the Earth's electric field prior to an earthquake, often unobservable within the electric background, which is significantly stronger and embedded in noise. Furthermore, EEP signals vary in terms of duration and size making reliable recognition even more difficult. An average model for EEP signals has been identified based on a time function describing the evolution of the number of propagating cracks. This paper describes the use of neuro-fuzzy networks (Neural Networks with intrinsic fuzzy logic abilities) for the reliable recognition of EEP signals within the electric field. Pattern recognition is performed by the neural network to identify the average EEP model from within the electric field. Use of the neuro-fuzzy model enables classification of signals that are not exactly the same, but do approximate the average EEP model, as EEPs. On the other hand, signals that look like EEPs but do not approximate enough the average model are suppressed, preventing false classification. The effectiveness of the proposed network is demonstrated using electrotelluric data recorded in NW Greece.

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“…Laboratory based studies have demonstrated the existence of weak electromagnetic emissions in various rock lithologies and cement mortar [2][3][4][5]. The generation mechanism/s is/are still uncertain but include the electrokinetic effect of moving water [6,7], piezoelectric effect of quartz [6,8], rock fracture (contact and separation of fresh surfaces) [9], and moving charge dislocations [10,11]. Some of these studies have shown that pressure stimulated current (PSC) emissions are related to a change in Young's modulus [12] and variations in PSC are observed beyond the linear elastic limit in marble specimens [13].…”

Section: Introductionmentioning

confidence: 99%

Measurement and correlation of acoustic emissions and pressure stimulated voltages in rock using an electric potential sensor

Archer

Dobbs

Aydın

et al. 2016

International Journal of Rock Mechanics and Mining Sciences

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Abstract.Previous laboratory based studies have demonstrated pressure stimulated currents and electromagnetic emissions in rock and cement mortar can be used to assess damage. There is some debate whether the current and electromagnetic emission measurement technologies used thus far are viable for field application. The results presented here provide evidence that electric potential sensors are a viable new technology for field monitoring of electrical emissions.Cylindrical specimens of rock were loaded at constant stress or strain rates until failure occurred; strain gauges, piezoelectric transducers and electric potential sensors were used to monitor the strain, acoustic emissions and pressure stimulated voltages. Pressure stimulated voltages were observed in the linear elastic and inelastic deformation regions of loading, suggesting that pressure stimulated voltages are associated with microcracking and macrocracking events.

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Electric current generation associated with the deformation rate of a solid: Preseismic and coseismic signals

Cited by 90 publications

References 11 publications

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

A neuro-fuzzy approach to the reliable recognition of electric earthquake precursors

Measurement and correlation of acoustic emissions and pressure stimulated voltages in rock using an electric potential sensor

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