Finite Element Method Characterization of 3D
Magnetic Flux Leakage Signal of Crack Discontinuities
at Multiple Liftoff Values
Publication: Publication Date: 1 September 2016Testing Method:
Previous studies commonly did analysis of magnetic
flux leakage (MFL) signals at only one linescan
liftoff and could not give comprehensive
information about the MFL field. This paper uses
the finite element method to analyze MFL information
of surface cracks on pipelines at multiple
liftoff values. The valley-valley spacing value of
axial components and peak-valley spacing value
of radial components are analyzed at multiple
liftoff values. Studies show that signals at multiple
liftoff values indicate more information than
signals at one liftoff. A technique using a double
liftoff compensation algorithm is proposed to
measure width more precisely.
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