On the separation of Lorentz and magnetization forces in the transduction mechanism of Electromagnetic Acoustic Transducers (EMATs)
File(s)NDTEINT-D-16-00056.pdf (401.74 KB)
Accepted version
Author(s)
Seher, M
Nagy, PB
Type
Journal Article
Abstract
Electromagnetic Acoustic Transducers (EMATs) are widely used in Nondestructive Evaluation (NDE) of metals, including the inspection of ferritic steels. Optimization of EMATs in ferromagnetic materials is often accomplished using computational simulations that account for the three main types of transduction mechanism, namely the effects of Lorentz forces, magnetization forces, and magnetostriction. The extensive literature on the Lorentz and magnetization mechanisms of EMATs has been historically scattered with alternative notations causing conflicting interpretations of the fundamental governing equations that often led to erroneous implementations of these equations in computational simulations. The purpose of this paper is to clarify this issue. The confusion is caused by the arbitrary nature of the separation of electromagnetic transduction force into Lorentz and magnetization components. This paper shows that apparently contradicting models are actually equivalent if the Lorentz and magnetization forces are chosen to correctly match each other, while mixing otherwise acceptable but mutually incompatible terms leads to unacceptable modelling errors. This paper also provides guidelines for the implementation of these transduction mechanisms in computational models for EMATs.
Date Issued
2016-07-05
Date Acceptance
2016-07-04
Citation
NDT & E International, 2016, 84, pp.1-10
ISSN
0963-8695
Publisher
Elsevier
Start Page
1
End Page
10
Journal / Book Title
NDT & E International
Volume
84
Copyright Statement
© 2016, Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000386739500001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Materials Science, Characterization & Testing
Materials Science
Electromagnetic Acoustic Transducers
Transduction
Lorentz force
Magnetization force
CONSERVATION LAW DESCRIPTION
EQUIVALENT SURFACE STRESSES
WAVES
MODEL
TRANSFORMATION
POLYCRYSTALS
GENERATION
FIELD
Acoustics
09 Engineering
Publication Status
Published