MWM eddy-current arrays for crack initiation and growth monitoring

Permanently mountable and scanning MWM ® (Meandering Winding Magnetometer) eddy-current arrays provide an effective means of monitoring fatigue in laboratory tests of specimens and test articles as well as in service on structural components, e.g., aircraft high-strength components, heavy machinery...

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Bibliographic Details
Published in:International journal of fatigue 2003-09, Vol.25 (9), p.1147-1155
Main Authors: Zilberstein, Vladimir, Walrath, Karen, Grundy, Dave, Schlicker, Darrell, Goldfine, Neil, Abramovici, Eugen, Yentzer, Tom
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Eddy current
Exact sciences and technology
Fatigue damage
Fatigue, brittleness, fracture, and cracks
Magnetic permeability
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals. Metallurgy
MWM
Physics
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Summary:Permanently mountable and scanning MWM ® (Meandering Winding Magnetometer) eddy-current arrays provide an effective means of monitoring fatigue in laboratory tests of specimens and test articles as well as in service on structural components, e.g., aircraft high-strength components, heavy machinery components, and bridge members. The MWM-Arrays can detect and monitor early stage fatigue damage and cracks by measuring electrical conductivity or, in the case of ferromagnetic materials, magnetic permeability. Preliminary results of fatigue tests with linear MWM-Arrays, mounted on a shot peened surface or on a shot peened and cadmium plated surface in the semi-cylindrical gage region of custom-designed high-strength fatigue specimen, are presented and discussed. The results indicate that both permanently mounted MWM-Arrays and scanning MWM-Arrays can detect fatigue damage in steels well before formation of cracks as verified by post-test scanning electron microscopy.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2003.08.010