Magnetizing frequency dependence of magneto-acoustic emission in pipeline steel

Author

Dhar, Ajay ; Atherton, David L.

Author_Institution

Dept. of Phys., Queen´´s Univ., Kingston, Ont., Canada

Volume

28

Issue

2

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

1003

Lastpage

1007

Abstract

Magnetoacoustic emission (MAE) in pipeline steel was investigated and found to increase linearly with the magnetizing frequency. The rate of increase of MAE RMS voltage with frequency was found to depend on the magnitude of the magnetic flux density. The observed MAE waveforms have been analyzed in terms of the frequency dependence of their RMS voltage and the pulse-height distribution of MAE voltage pulses. With increasing magnetizing frequency, the smaller amplitude MAE pulses are replaced by large amplitude pulses, and the total number of MAE pulses also increases. The results are discussed in light of existing models of domain wall motion and magnetoacoustic emission

Keywords

acoustic emission testing; ferromagnetic properties of substances; magnetisation; magnetoacoustic effects; steel; MAE RMS voltage; MAE waveforms; domain wall motion; magnetic flux density; magnetising frequency dependence; magnetoacoustic emission; pipeline steel; pulse-height distribution; Acoustic pulses; Frequency dependence; Magnetic analysis; Magnetic domain walls; Magnetic domains; Magnetic flux; Magnetoelasticity; Pipelines; Steel; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.123852

Filename

123852