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.

中文翻译：

---

用于模拟涡流测试的混合配方域分解有限元方法

使用传统的有限元方法 (FEM) 通过扫描铁氧体磁芯线圈来模拟涡流测试 (ECT) 需要重新划分网格，因为它使用一个求解域来覆盖所有导电材料和磁性材料，这繁琐，计算效率低。在本文中，我们提出了混合公式域分解 FEM 来解决该问题。解决方案域被分解为两个子域，测试样品和铁氧体磁芯包含在不同的子域中。子域分别离散化，离散化只执行一次。简化磁矢量电势公式用于测试样品的子域，而磁标量电势公式用于铁氧体磁芯的子域。将所提出的方法用于模拟具有或不具有缺陷的通孔铝板的ECT，并证明了该方法的有效性。最后，进行实验验证。