Sizing of Volumetric Stress Corrosion Crack from Eddy Current Testing Signals with Consideration of Crack Width

摘要

In this paper, the influence of crack width on the reconstruction of Stress Corrosion Crack (SCC) from Eddy Current Testing (ECT) signals is investigated. The features of the simulated ECT signals due to cracks of different widths and conductivities are extracted and compared with those of the measured SCC signals. A strategy, which treats the crack width and the other crack parameters separately, is introduced to cope with the effect of crack width. The feature parameters of 2D ECT signals from a pluspoint sensor are applied to predict the crack width and conductivity, before the other detailed parameters are reconstructed in a conventional way. To implement the proposed strategy, the fast forward solver developed by authors is updated for asymmetric problem and cracks of arbitrary width. It is demonstrated that the new strategy can improve sizing result for artificial SCC though it is still not satisfactory for a deeper SCC.