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Analysis of the Mechanism of Leakage Magnetic Field Generated by Internal Defects
Journal of Nondestructive Evaluation, 2023Rongbiao Wang +5 more
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NDT and E International, 2007 Magnetic flux leakage (MFL) testing is widely used to detect and characterise defects in pipelines, rail tracks and other structures. The measurement of the two field components perpendicular to the test surface and parallel to the applied field in MFL ...
John Wilson, Gui Yun Tian
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The magnetic leakage field of surface-breaking cracks
Journal of Physics D: Applied Physics, 1986A 2D mathematical model for the magnetic leakage field of surface-breaking cracks in ferromagnetic materials is developed. The expressions are shown to be valid for 3D defects provided they are at least twenty times as long as they are deep. The model is tested by comparison with measured leakage fields for the range of artificial cracks.
C Edwards, S B Palmer
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The variation with temperature of the magnetic leakage field in cobalt
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1958Abstract The variation with temperature of the magnetic leakage field of an unmagnetized crystal of hexagonal cobalt has been investigated by means of an electron beam. Both the prism and hexagonal faces were examined in the temperature range of 20 to 380 °C by a new method using a divergent electron beam.
Moses Blackman, E. Grünbaum
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Reconstruction of damage-induced magnetization with leakage magnetic field signals
International Journal of Applied Electromagnetics and Mechanics, 2012The phenomenon of damage-induced magnetization possesses good application prospects in nondestructive testing and material evaluation purpose, once the relationship between the mechanical damage and the induced magnetization can be quantitatively established. As the magnetization can not be measured directly, it is vital to reconstruct the distribution
Li, Hongmei +4 more
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Importance of Magnetizing Field on Magnetic Flux Leakage Signal of Defects
IEEE Transactions on Magnetics, 2018The measurement of magnetic flux leakage (MFL) is widely used as a non-destructive technique for inspecting oil and gas pipelines. In this method, many factors can affect the MFL signal, but the magnetization of the pipeline is a fundamental issue that bears consideration.
Hong Quang Pham +3 more
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Magnetic field leakage into a semi-infinite pipe
Canadian Journal of Physics, 1968Various conditions near the end of a semi-infinite, perfectly conducting pipe with a perfectly conducting flange are critically examined with regard to their effects on the interior field when the pipe is exposed to a low-frequency magnetic field. This is accomplished by solving several pertinent boundary-value problems.
R. W. Latham, K. S. H. Lee
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Coil optimization for homogeneous magnetic field with small leakage field
IEEE Transactions on Magnetics, 2000The paper describes the optimization technique of coils which generate a homogeneous magnetic field area inside the coils but very small leakage field outside. These requirements are necessary to carry out effective electromagnetic exposure experiments.
S. Sato +3 more
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Characterizing defects by determining magnetic leakage fields
NDT International, 1977Abstract Harwell's computerised ndt literature store was used to identify papers discussing magnetic flux leakage detection of defects. The following survey deals with those papers which deal at least in part with the characterization of defects rather than purely defect detection.
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Research of leakage magnetic field in deenergized transformer
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2018Purpose The paper presents the analysis of magnetic field that surrounds the power transformer after it has been switched off. The purpose of this paper is to determine the possibility of defining the residual fluxes in the legs of the transformer based on the measurement of this field.
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