Detail publikace

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

KOKTAVÝ, P., KOKTAVÝ, B.

Originální název

A Model for an Electromagnetic signal Generated by Crack Creation 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

Crack, Electric charge, Electromagnetic emission, Acoustic emission

Autoři

KOKTAVÝ, P., KOKTAVÝ, B.

Rok RIV

2003

Vydáno

1. 1. 2003

Nakladatel

Brno University of Technology

Místo

Brno

ISBN

80-7204-318-8

Kniha

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

Strany od

47

Strany do

52

Strany počet

6

BibTex

@inproceedings{BUT9236,
  author="Pavel {Koktavý} and Bohumil {Koktavý}",
  title="A Model for an Electromagnetic signal Generated by Crack Creation in Solids",
  booktitle="Proceedings of the Workshop NDT CMC 2003 Non-Destructive Testing of Civil Materials and Constructions",
  year="2003",
  pages="6",
  publisher="Brno University of Technology",
  address="Brno",
  isbn="80-7204-318-8"
}