A Model for an Electromagnetic signal Generated by Crack Creation in Solids

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

A Model for an Electromagnetic signal Generated by Crack Creation in Solids

Popis výsledku v původním jazyce

When a stress is applied to the solids (rocks or tiles) cracks creation can be detected by signals of an acoustic and electromagnetic emission. The experimental study has been performed on rock samples. Two metallic layers have covered the tested devicesto create metal-insulator-metal structure. During the process of the crack generation the electric charges appeared at the faces of the cracks. The electric dipole system is a source of voltage induced on metal electrodes. Using Shockley-Ramo theorem, tthe differential equation for induced voltage is derived. We found that voltage on measuring capacitor is directly proportional to the dipole width and its active area. The recorded electric signal is superposition of crack walls "self" vibration given by crack length and vibration due to an ultrasonic wave given by sample dimensions. The electromagnetic signal precedes the acoustic emission response and time delay corresponds to the difference of propagation velocities of sound and elec

Název v anglickém jazyce

A Model for an Electromagnetic signal Generated by Crack Creation in Solids

Popis výsledku anglicky

When a stress is applied to the solids (rocks or tiles) cracks creation can be detected by signals of an acoustic and electromagnetic emission. The experimental study has been performed on rock samples. Two metallic layers have covered the tested devicesto create metal-insulator-metal structure. During the process of the crack generation the electric charges appeared at the faces of the cracks. The electric dipole system is a source of voltage induced on metal electrodes. Using Shockley-Ramo theorem, tthe differential equation for induced voltage is derived. We found that voltage on measuring capacitor is directly proportional to the dipole width and its active area. The recorded electric signal is superposition of crack walls "self" vibration given by crack length and vibration due to an ultrasonic wave given by sample dimensions. The electromagnetic signal precedes the acoustic emission response and time delay corresponds to the difference of propagation velocities of sound and elec

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the Workshop NDT CMC 2003 Non-Destructive Testing of Civil Materials and Constructions

ISBN

80-7204-318-8

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

47-52

Název nakladatele

Brno University of Technology

Místo vydání

Brno

Místo konání akce

Brno

Datum konání akce

3. 12. 2003

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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