Detail publikace

A Model for an Electromagnetic Emission Signal Generated by Crack Creation

KOKTAVÝ, P., ŠIKULA, J., KOKTAVÝ, B.

Originální název

A Model for an Electromagnetic Emission Signal Generated by Crack Creation

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 v angličtině

MIM system, Crack, Electromagnetic emission, Acoustic emission

Autoři

KOKTAVÝ, P., ŠIKULA, J., KOKTAVÝ, B.

Rok RIV

2001

Vydáno

20. 6. 2001

Nakladatel

Czech Society for Non-Destructive Testing, German Society for Non-Destructive Testing

Místo

Praha

ISBN

80-238-7263-X

Kniha

Proceedings of NDT in Progress

Číslo edice

1

Strany od

283

Strany do

290

Strany počet

8

BibTex

@{BUT70357
}