Title :
Mechanical damage detection with magnetic flux leakage tools: modeling the effect of localized residual stresses
Author :
Babbar, Vijay ; Shiari, Behrouz ; Clapham, Lynann
Author_Institution :
Appl. Magnetics Group, Queen´´s Univ., Amritsar, India
Abstract :
We used three-dimensional (3-D) magnetic finite-element analysis (FEA) to simulate the effect of localized residual stresses on magnetic flux leakage (MFL) signals from a steel plate in the absence of a geometrical defect. We derived the local residual stress patterns from finite-element structural modeling of simulated dents. The magnetic FEA model simulates these localized residual stresses by assigning appropriate directional permeability values to the magnetically anisotropic materials. Considering the necessary simplifications required for magnetic FEA modeling, the simulated MFL patterns are in good agreement with the experimentally observed patterns associated with the stresses around a dent.
Keywords :
finite element analysis; magnetic field measurement; magnetic flux; mechanical testing; mechanical variables measurement; 3-D magnetic finite-element analysis; directional permeability; finite-element structural modeling; geometrical defect; local residual stress patterns; localized residual stresses; magnetic flux leakage signals; magnetic flux leakage tools; magnetically anisotropic materials; mechanical damage detection; nondestructive evaluation; simulated dents; steel plate; Analytical models; Finite element methods; Leak detection; Magnetic analysis; Magnetic anisotropy; Magnetic flux leakage; Perpendicular magnetic anisotropy; Residual stresses; Signal analysis; Solid modeling;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.821121