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Title: Detection of mechanical damage using the magnetic-flux leakage technique
Category: Pigsource Papers
Downloadable: Yes 
Catalog No.: pg3423
Date of Publication: Feb 1 2005 12:00AM
Price: $25.00 US
Authors: Lynann Clapham, Vijay Babbar, and James Byrne
Abstract: This paper summarizes recent results of experimental and modeling studies of MFL signals resulting from mechanical damage. In experimental studies, mechanical damage was simulated using a tool and die press to produce dents of varying depths in plate samples. Radial component MFL measurements were made before and after selective stress-relieving heat treatments. These annealing treatments enabled the stress and geometry components of the MFL signal to be separated. Geometry and stress effects generate separate MFL peaks – the geometry effects lead to central peak regions while the stress effects produce ‘shoulder’ peaks. In general the geometry peaks tend to scale with depth, while the shoulder peaks remain approximately constant. This implies that deep dents will display a ‘geometry’ signature while shallow or rerounded dents will have a stress signature. Finally, the influence of other parameters such as flux density and topside/bottomside inspection was also quantified.
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