Abstract
Pulse eddy currents are proposed for detection of cracks in structural conductive, non-magnetic parts. The rectangular pulse accounts for a multi-frequency analysis with the lower harmonics pentrating deeper in the material. An integral-FEM method for simulation of transient eddy-currents and model of defects as zero-thickness, two-dimensional flaws are used. Difference signals peak value depends on crack depth and the peak value moment is delayed for smaller outer defects. The method is effective for defects buried deep under the surface.
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