Abstract
Simulation of eddy-current testing (ECT) with the scanning of a ferrite-core coil using the conventional finite-element method (FEM) requires re-meshing, as it uses one solution domain to cover all the conducting materials and magnetic materials, which is cumbersome and results in low computation efficiency. In this article, we present the hybrid formulation domain-decomposition FEM to resolve the problem. The solution domain is decomposed into two subdomains, and the test sample and the ferrite core are included in different subdomains. The subdomains are discretized separately, and the discretization is performed only once. The reduced magnetic vector potential formulation is used in the subdomain of the test sample, whereas the magnetic scalar potential formulation is used in the subdomain of the ferrite core. The proposed method is applied in simulating the ECT of the aluminum plates having through holes with or without defects, and the efficiency of the method is demonstrated. Finally, experimental validation is performed.
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