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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F03%3APU39252" target="_blank" >RIV/00216305:26220/03:PU39252 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
A Model for an Electromagnetic signal Generated by Crack Creation in Solids
Original language description
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
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2003
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
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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Number of pages
6
Pages from-to
47-52
Publisher name
Brno University of Technology
Place of publication
Brno
Event location
Brno
Event date
Dec 3, 2003
Type of event by nationality
CST - Celostátní akce
UT code for WoS article
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