NUMERICAL AND EXPERIMENTAL-ANALYSIS OF EDDY-CURRENT TESTING FOR A TUBE WITH CRACKS
NUMERICAL AND EXPERIMENTAL-ANALYSIS OF EDDY-CURRENT TESTING FOR A TUBE WITH CRACKS
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DOI：
10.1109/20.123973
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发表时间：
1992-03-01
影响因子：
2.1
通讯作者：
SHIMIZU, N
中科院分区：
文献类型：
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作者：
HASHIZUME, H;YAMADA, Y;SHIMIZU, N
利用二维T法(电流矢量电位法)，提出了一种计算管道表面裂纹涡流检测中阻抗信号的新方法。通过在裂纹区引入准电导率来近似表面裂纹周围的三维电流流动。此外，通过将裂纹宽度减小到零，得到了裂纹表面电流矢量势与邻域势之间的最终矩阵，从而不再需要裂纹区的单元。数值计算结果与实验结果吻合较好，表明了本文方法的有效性，并为利用该程序设计更高效的电容层析成像探头提供了可能。
A new method to calculate impedance signal in Eddy Current Testing(ECT) for a tube with surface cracks is developed using the two dimensional T-method (current vector potential method). Three dimensional current flow around a surface crack is approximated by introducing quasi conductivity in the crack region. Further a final matrix relating the current vector potentials on the crack surface with neighboring potentials is obtained by decreasing the width of the crack to zero and then the elements in the crack region are not necessary any longer. The numerical results show good agreement with the experimental ones, which indicates the validity of the method proposed here and the possibility to design more efficient probe of the ECT using the code.