Abstract
The paper addresses the first eddy current benchmark problem proposed by the World Federation of Nondestructive Evaluation Centers (WFNDEC). The problem simulates the eddy current response to the presence of an axisymmetric circumferential defect in an Inconel-600 tube. All simulations employ the axisymmetric code of the electromagnetic field simulator Finite Element Method Magnetics. For three different frequencies of excitation, it is explained how the displacement of the detecting coil inside the tube leads to a variation in the impedance of the eddy current coil. Variations of the resistive and inductive components of the impedance with distance from the defect region are used to build the impedance trajectory for each frequency of analysis.
Highlights
The first eddy current benchmark problem proposed by the World Federation of Nondestructive Evaluation Centers (WFNDEC) simulates the eddy current response to the presence of an axisymmetric circumferential defect in an Inconel-600 tube [1]
Eddy current testing (ECT) relies on the change in impedance of a detecting coil caused by the presence of electrical currents induced on a test specimen subjected to a time-varying magnetic field
The technique is used for the detection of cracks and other defects that interrupt the flow of the induced currents in the test specimen
Summary
The first eddy current benchmark problem proposed by the World Federation of Nondestructive Evaluation Centers (WFNDEC) simulates the eddy current response to the presence of an axisymmetric circumferential defect in an Inconel-600 tube [1]. The widespread use of NDE fusion techniques has initially been registered on the book of Gros [6] and later, at the World Conferences on NDE hosted in Rome and Montreal in the years of 2000 and 2004, respectively [7] [8] These research groups have used different ECT codes based on the magnetic vector-scalar potential A-V formulation [11] [12] Data presented in these papers consist of impedance trajectories in the R-X plane for four different frequencies of excitation.
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