Abstract
The signal of an alternating magnetic flux leakage testing is affected by several factors, such as the buried length from surface, depth of crack. In this paper, the effects of those factors on the flux distribution near a search coil are examined using 3-D nonlinear FEM. It is shown that the leakage flux is produced by the saturation of steel near the surface, if the distance from the surface to a crack is small.
Published Version
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