Cracks Characterisation by Acoustic and Electromagnetic Emission

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F02%3APU30700" target="_blank" >RIV/00216305:26220/02:PU30700 - 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
Cracks Characterisation by Acoustic and Electromagnetic Emission
Original language description
The simultaneous investigation of an electromagnetic (EME) and acoustic (AE) emission in solids is described. This method can give additional information on crack creation kinetic and improve crack localisation and its parameters assessment. Granite samples were loaded with a constant stress rate up to their failure and AE and EME signals measured in four channel set-up. Both signals show different behaviour in the first interval of about 10 ms just after crack creation, where high frequency componentscorresponding to crack walls vibration are dominant, and in the remaining period of about 300 ms where the detected signals time dependence is given mainly by whole sample eigen-vibrations. The EME signal on-set defines exactly the time of crack creationand from the time delay of recorded AE signals the crack position can be determined. The observed high frequency signal of several MHz corresponds to crack length of the order of 1 mm.
Czech name
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Czech description
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Publication year
2002
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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