Eddy current interaction with a thin-opening crack in a plate conductor

被引：11

作者：

Dezhi, Chen ^{[1
]}

Shao, K.R. ^{[1
]}

Jianni, Sheng ^{[1
]}

Weili, Yan ^{[1
]}

机构：

[1] Huazhong Univ of Science and, Technology, Wuhan, China

来源：

IEEE Transactions on Magnetics | 2000年 / 36卷 / 4 I期

关键词：

Cracks - Current density - Eddy current testing - Green's function - Integral equations - Perturbation techniques;

D O I：

10.1109/20.877781

中图分类号：

学科分类号：

摘要：

In eddy current testing (ECT), a thin-opening crack in a plate conductor is much frequently encountered. The eddy current field perturbation due to the crack may be described as the effect produced by an equivalent current dipole layer located on its surface. The dipole density may be found by solving a boundary integral equation. In this paper, formulas of the electric dyadic Green's function for a limited thickness plate are derived. Following a moment method scheme, numerical predictions are made for Benchmark models of ECT for steam generator, step 2. The eddy current perturbations due to the cracks are calculated. The probe impedance changes are also evaluated and are compared with experiments, and good agreement is found.

引用

页码：1745 / 1749