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概要

We numerically compute the impedance of the probe-coil as an eddy-current signal due to stress corrosion cracks (SCC) and/or fatigue cracks in the conductive an d nonmagnetic materials by using 3D finite element model. The fine shallow cracks with various structures are self-consistently simulated by providing zero-condu ctivity with a part of the background materials. We find the significant difference in the coil impedance, which crucially depends on the crack geometries. Our model and the obtained results would be helpful in understanding the eddy-current behavior around the cracks, and also in predicting the internalcrack structures

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