Invesigation of the Magnetic Flux Leakage Signatures of Dents and Gouges
Loading...
Authors
Marble, Kristopher
Date
2009-09-27T18:30:00Z
Type
thesis
Language
eng
Keyword
magnetic flux leakage , pipeline steel , dents , gouges , magnetic Barkhausen noise , stress
Alternative Title
Abstract
A study of gouges and dents in the context of pipelines has been completed, using the non-destructive evaluation (NDE) techniques of magnetic flux leakage (MFL) and magnetic Barkhausen noise (MBN). The research is part of an ongoing effort by the Applied Magnetics Group (AMG) at Queen's University to improve the interpretation of the MFL signal, which is used extensively by industry for defect detection and evaluation.
The gouges were found to have distinctive MFL signatures depending on their orientation relative to the magnetization axis. Features in the MFL signal were identified as superpositions of geometry-related effects and strain or work hardening of the surface material. A qualitative magnetic permeability distribution in the material near a gouge has been proposed. The distribution is expected to vary in magnitude and extent according to the defect severity.
The MFL results of the dent studies, on samples made available by Gaz de France (GdF), largely agreed qualitatively with previous research of dents. However, the differences pointed to the need for study of more varied dent shapes; new signal features were observed that suggested tensile residual strain in the dent rim is more prominent than earlier studies and modeling have predicted.
Additionally, upgrades made to the MFL scanning system used by the AMG and a novel approach for building computer models are detailed.
Description
Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2009-09-24 17:13:12.775
Citation
Publisher
License
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.