Publication detail

Experimental study of electromagnetic emission signals generated by crack generation in composite materials

KOKTAVÝ, P.

Original Title

Experimental study of electromagnetic emission signals generated by crack generation in composite materials

Type

journal article - other

Language

English

Original Abstract

The formation of a crack is accompanied by the generation of an electromagnetic field. A differential equation was derived and solved to describe the transformation of the field parameters into an electric signal, provided capacitive sensors are used. In the next stage, an analysis of spurious external electromagnetic and acoustic fields was carried out and measures to suppress their effects were designed. The issue of amplifying extremely low electromagnetic signals generated during the crack formation was dealt with, too. The mentioned analyses resulted in the design of a method to detect and evaluate electromagnetic emission (EME) signals and acoustic emission (AE) signals, which accompany mechanical stressing of materials and structures. Based on the results of such analyses, an automated double-channel measuring apparatus was used for signal data acquisition, saving and processing. The operation of the apparatus was successfully tested by processing a large set of measurement results obtained from a composite material called "extren". Our experimental results confirmed the correctness of both the EME and AE measurement methods and measuring apparatus design. Our measurement results make it possible to track the behaviour of cracks, localize them and evaluate some of their basic parameters.

Keywords

electromagnetic emission, acoustic emission, crack, composite material

Authors

KOKTAVÝ, P.

RIV year

2008

Released

8. 12. 2008

Publisher

IOP Publishing

Location

online doi: 10.1088/0957-0233/20/1/015704

ISBN

0957-0233

Periodical

Measurement Science and Technology

Year of study

20

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages to

015704

Pages count

8

URL

http://www.iop.org/EJ/toc/0957-0233/20/1

BibTex

@article{BUT49292,
  author="Pavel {Koktavý}",
  title="Experimental study of electromagnetic emission signals generated by crack generation in composite materials",
  journal="Measurement Science and Technology",
  year="2008",
  volume="20",
  number="1",
  pages="8",
  issn="0957-0233",
  url="http://www.iop.org/EJ/toc/0957-0233/20/1"
}