Physics 901 Colloquium (Internal to Department)

Effects of Stress and Geometry on Magnetic Flux Leakage and Magnetic Barkhausen Noise from Interacting Defects

Catalin Mandache
Queen's University, Dept. of Physics

Time
Tue. January 28, 2003     11:30 AM     Stirling A

Abstract

My research project investigates the stress-dependent magnetic flux leakage (MFL) signatures generated by interacting and racetrack defects introduced in steel specimens. A total of ten samples containing seven interacting pits and three racetrack defects, having different drilling stress conditions and center-to-center distances are examined. Depending on the applied flux density and the separation between the adjacent pits - several methods of finding defects geometry parameters are proposed. These techniques are based on angular Barkhausen noise (MBN) calibrations and MFL signature analysis of radial and axial components of the leakage field generated by pipe wall material loss. Preliminary laboratory runs show promising results in attaining the industrial target of 5% accuracy in defect sizing through MFL method.

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