An Improved Dipole Model of 3-D Magnetic Flux Leakage

David A.G. Trevino, Sushant M. Dutta, Fathi H. Ghorbel, Mansour Karkoub

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this paper, we present an improved analytical 3-D magnetic flux leakage (MFL) model of the field due to the occurrence of a surface-breaking defect in a ferromagnetic specimen. This model is based on our recent magnetic dipole model (MDM) of the MFL field, which was derived from the first principles of Maxwell's equations. The MDM assumes a ferromagnetic specimen with a small defect exposed to a uniform external magnetic field, which is strong enough to saturate the specimen locally and causes uniform magnetization around the defect. Under this assumption, the MFL field can be mathematically described as if it is caused by magnetic charges on the surface of the defect. The magnitude and the sign of these magnetic charges are given by the magnetization vector and the local unit vector normal to the surface of the defect. Our original MDM uses only one parameter to describe the normal vector, and can only be used to analyze simple defect shapes, such as cylinders and cuboids. Our improved model in this paper uses two parameters to describe the normal vector, and can be used to analyze a wider range of defects, such as cones, ellipsoids, and real defect shapes. We illustrate our improved model by comparing its solution to that of the original MDM and validating it with the finite-element method simulations for different defect shapes. Our analysis shows that the improved model gives a good approximation of the MFL fields for a much wider range of defect shapes than the original MDM does.

Original languageEnglish
JournalIEEE Transactions on Magnetics
Volume52
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016

Fingerprint

Magnetic flux
Defects
Magnetization
Maxwell equations
Cones
Magnetic fields
Finite element method

Keywords

  • Dipole model, magnetic charge
  • magnetic flux leakage (MFL)
  • magnetization
  • nondestructive evaluation (NDE)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

An Improved Dipole Model of 3-D Magnetic Flux Leakage. / Trevino, David A.G.; Dutta, Sushant M.; Ghorbel, Fathi H.; Karkoub, Mansour.

In: IEEE Transactions on Magnetics, Vol. 52, No. 12, 01.12.2016.

Research output: Contribution to journalArticle

Trevino, David A.G. ; Dutta, Sushant M. ; Ghorbel, Fathi H. ; Karkoub, Mansour. / An Improved Dipole Model of 3-D Magnetic Flux Leakage. In: IEEE Transactions on Magnetics. 2016 ; Vol. 52, No. 12.
@article{9e8bc5d04be8428a82bffcee66acd931,
title = "An Improved Dipole Model of 3-D Magnetic Flux Leakage",
abstract = "In this paper, we present an improved analytical 3-D magnetic flux leakage (MFL) model of the field due to the occurrence of a surface-breaking defect in a ferromagnetic specimen. This model is based on our recent magnetic dipole model (MDM) of the MFL field, which was derived from the first principles of Maxwell's equations. The MDM assumes a ferromagnetic specimen with a small defect exposed to a uniform external magnetic field, which is strong enough to saturate the specimen locally and causes uniform magnetization around the defect. Under this assumption, the MFL field can be mathematically described as if it is caused by magnetic charges on the surface of the defect. The magnitude and the sign of these magnetic charges are given by the magnetization vector and the local unit vector normal to the surface of the defect. Our original MDM uses only one parameter to describe the normal vector, and can only be used to analyze simple defect shapes, such as cylinders and cuboids. Our improved model in this paper uses two parameters to describe the normal vector, and can be used to analyze a wider range of defects, such as cones, ellipsoids, and real defect shapes. We illustrate our improved model by comparing its solution to that of the original MDM and validating it with the finite-element method simulations for different defect shapes. Our analysis shows that the improved model gives a good approximation of the MFL fields for a much wider range of defect shapes than the original MDM does.",
keywords = "Dipole model, magnetic charge, magnetic flux leakage (MFL), magnetization, nondestructive evaluation (NDE)",
author = "Trevino, {David A.G.} and Dutta, {Sushant M.} and Ghorbel, {Fathi H.} and Mansour Karkoub",
year = "2016",
month = "12",
day = "1",
doi = "10.1109/TMAG.2015.2475429",
language = "English",
volume = "52",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "12",

}

TY - JOUR

T1 - An Improved Dipole Model of 3-D Magnetic Flux Leakage

AU - Trevino, David A.G.

AU - Dutta, Sushant M.

AU - Ghorbel, Fathi H.

AU - Karkoub, Mansour

PY - 2016/12/1

Y1 - 2016/12/1

N2 - In this paper, we present an improved analytical 3-D magnetic flux leakage (MFL) model of the field due to the occurrence of a surface-breaking defect in a ferromagnetic specimen. This model is based on our recent magnetic dipole model (MDM) of the MFL field, which was derived from the first principles of Maxwell's equations. The MDM assumes a ferromagnetic specimen with a small defect exposed to a uniform external magnetic field, which is strong enough to saturate the specimen locally and causes uniform magnetization around the defect. Under this assumption, the MFL field can be mathematically described as if it is caused by magnetic charges on the surface of the defect. The magnitude and the sign of these magnetic charges are given by the magnetization vector and the local unit vector normal to the surface of the defect. Our original MDM uses only one parameter to describe the normal vector, and can only be used to analyze simple defect shapes, such as cylinders and cuboids. Our improved model in this paper uses two parameters to describe the normal vector, and can be used to analyze a wider range of defects, such as cones, ellipsoids, and real defect shapes. We illustrate our improved model by comparing its solution to that of the original MDM and validating it with the finite-element method simulations for different defect shapes. Our analysis shows that the improved model gives a good approximation of the MFL fields for a much wider range of defect shapes than the original MDM does.

AB - In this paper, we present an improved analytical 3-D magnetic flux leakage (MFL) model of the field due to the occurrence of a surface-breaking defect in a ferromagnetic specimen. This model is based on our recent magnetic dipole model (MDM) of the MFL field, which was derived from the first principles of Maxwell's equations. The MDM assumes a ferromagnetic specimen with a small defect exposed to a uniform external magnetic field, which is strong enough to saturate the specimen locally and causes uniform magnetization around the defect. Under this assumption, the MFL field can be mathematically described as if it is caused by magnetic charges on the surface of the defect. The magnitude and the sign of these magnetic charges are given by the magnetization vector and the local unit vector normal to the surface of the defect. Our original MDM uses only one parameter to describe the normal vector, and can only be used to analyze simple defect shapes, such as cylinders and cuboids. Our improved model in this paper uses two parameters to describe the normal vector, and can be used to analyze a wider range of defects, such as cones, ellipsoids, and real defect shapes. We illustrate our improved model by comparing its solution to that of the original MDM and validating it with the finite-element method simulations for different defect shapes. Our analysis shows that the improved model gives a good approximation of the MFL fields for a much wider range of defect shapes than the original MDM does.

KW - Dipole model, magnetic charge

KW - magnetic flux leakage (MFL)

KW - magnetization

KW - nondestructive evaluation (NDE)

UR - http://www.scopus.com/inward/record.url?scp=85027522447&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027522447&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2015.2475429

DO - 10.1109/TMAG.2015.2475429

M3 - Article

VL - 52

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 12

ER -