Reconstruction of cracks with physical closure from signals of eddy current testing

Chen, Z.; not registered ; not registered

In this paper, a method for reconstruction of a crack with faces in physical contact (closures) is proposed utilizing signals of eddy current testing(ECT).Based on a numerical model proposed for modeling the crack,a fast forward solver for simulation of the ECT signals is extended to deal with the crack closures.In order to reconstruct crack parameters in different type (e.g.,shape parameters and conductivity),an algorithm based on the conjugate gradient method was developed with use of ECT signals predicated using the rapidforward solver.Acceptable reconstruction results were obtained for several testing problems that,in turn, verified the validity of the proposed approach.