Acoustic and electromagnetic emission as a tool for crack localization

被引：21

作者：

Sedlak, P. ^{[1
]}

Sikula, J. ^{[1
]}

Lokajicek, T. ^{[2
]}

Mori, Y. ^{[3
]}

机构：

[1] Brno Univ Technol, Fac Elect Engn & Commun, Czech Noise Res Lab, Brno 61600, Czech Republic

[2] Acad Sci Czech Republ VVI, Inst Geol, Prague 16500 6, Lysolaje, Czech Republic

[3] Nihon Univ, Coll Ind Technol, Chiba 2758575, Japan

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2008年 / 19卷 / 04期

关键词：

acoustic emission; electromagnetic emission; cracks; localization;

D O I：

10.1088/0957-0233/19/4/045701

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The creation of cracks is accompanied by electric charge redistribution due to loosened chemical bounds. Electric charge on a crack wall creates dipole moments. Vibrations of crack walls produce time-dependent dipole moments and, consequently, electric and magnetic fields are generated. An electric signal is induced on metal electrodes. Simultaneously with the electromagnetic emission (EME) signal, an acoustic emission (AE) signal is generated, but due to the different velocities of propagation of both waves, the detection of the AE signal is delayed. This time delay presents the time of the wave propagation from the individual acoustic emission sensor to the crack. The defect can be located by means of these time intervals. This paper describes the localization using acoustic and electromagnetic emission signals for the two-dimensional case.

引用

页数：7

共 9 条

[1] Acoustic emission source location based on signal features
Blahacek, M.
Chlada, M.
Prevorovsky, Z.
[J]. ACOUSTIC EMISSION TESTING, 2006, 13-14 : 77 - +
[2] CHLADA M, 2006, P 36 INT C DEF 2006, P91
[3] EXPERIMENTAL-MEASUREMENT OF ELECTROMAGNETIC EMISSIONS POSSIBLY RELATED TO EARTHQUAKES IN JAPAN
GOKHBERG, MB
MORGOUNOV, VA
YOSHINO, T
TOMIZAWA, I
[J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1982, 87 (NB9): : 7824 - 7828
[4] Characterization of acoustic and electromagnetic emission sources
Koktavy, P
Pavelka, J
Sikula, J
[J]. MEASUREMENT SCIENCE AND TECHNOLOGY, 2004, 15 (05) : 973 - 977
[5] MAJZNER J, 2005, P 3 WORKSH NDT PROGR, P211
[6] MORI Y, 2004, P 26 EUR C AC EM TES, P167
[7] Nature of electromagnetic emission precursory to an earthquake
Rikitake, T
[J]. JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1997, 49 (09): : 1153 - 1163
[8] SIKULA J, 2002, P 8 ECNDT AEND BARC
[9] RADIO-EMISSION ASSOCIATED WITH ROCK FRACTURE - POSSIBLE APPLICATION TO THE GREAT CHILEAN EARTHQUAKE OF MAY 22, 1960
WARWICK, JW
STOKER, C
MEYER, TR
[J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1982, 87 (NB4): : 2851 - 2859

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