Přístupnostní navigace
E-přihláška
Vyhledávání Vyhledat Zavřít
Detail publikace
KOKTAVÝ, P. ŠIKULA, J. KOKTAVÝ, B.
Originální název
Electromagnetic Emission Signal Generated by a Moving Crack in Solids
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
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 devices to 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, the 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 electromagnetic radiation in the sample. The simultaneous investigation of acoustic and electromagnetic emission signals enable us to localise the crack position in solids.
Klíčová slova
Electromagnetic Emission, Acoustic Emission, Crack
Autoři
KOKTAVÝ, P.; ŠIKULA, J.; KOKTAVÝ, B.
Rok RIV
2002
Vydáno
1. 1. 2002
Nakladatel
Ing. Zdeněk Novotný, CSc.
Místo
Brno
ISBN
80-238-9094-8
Kniha
Noise and Non-linearity Testing of Modern Electronic Components
Číslo edice
1.
Strany od
134
Strany do
139
Strany počet
6
BibTex
@inproceedings{BUT5690, author="Pavel {Koktavý} and Josef {Šikula} and Bohumil {Koktavý}", title="Electromagnetic Emission Signal Generated by a Moving Crack in Solids", booktitle="Noise and Non-linearity Testing of Modern Electronic Components", year="2002", number="1.", pages="6", publisher="Ing. Zdeněk Novotný, CSc.", address="Brno", isbn="80-238-9094-8" }