Analysis Of Eddy Current Testing Research Articles

Finite Element Analysis of Eddy Current Testing of Aluminum Honeycomb Sandwich Structure with CFRP Panels Based on the Domain Decomposition Method

Finite Element Analysis of Eddy Current Testing of Aluminum Honeycomb Sandwich Structure with CFRP Panels Based on the Domain Decomposition Method

Experimental and numerical analysis of eddy current sensor signal induced by out-of-plane fiber waviness in carbon fiber composites

Eddy current sensor signals induced by out-of-plane waviness in carbon fiber composites were investigated. Cross-ply laminates with artificial out-of-plane waviness were fabricated. The samples were scanned using an eddy current probe to measure the in-phase and quadrature phase components of the pickup coil voltage with respect to the excitation. A two-dimensional map of the pickup coil voltage amplitude indicated that it was difficult to distinguish signal changes in the waviness zone from signal changes caused by inhomogeneous electrical properties. By selecting the optimum image phase and probe rotation angle, the signal-to-noise ratio was improved greatly and the waviness was visualized without being masked by signal changes in the non-defective zone. Finite element analysis of eddy current testing was performed for various waviness amplitudes and wavelengths to obtain the relationship between the waviness dimension and the pickup coil voltage. The finite element analysis validated the enhanced sensitivity to waviness observed experimentally.

Analysis of eddy-current testing and metallographic examinations for corrosion damages of heat exchanging tubes in NPP steam generators

Analysis of eddy-current testing and metallographic examinations for corrosion damages of heat exchanging tubes in NPP steam generators

Numerical analysis of eddy current testing for tubes using uniform eddy current distribution

The eddy current testing is used for a testing of the steam generator tubes in pressurized water reactor nuclear power plants because of its high accuracy and high speed. It is important to judge shape of cracks from measured signals. We have developed a rotating type probe using an excitation coil that generates uniform eddy current distribution. Because the shape of excitation current source has no influence on detecting cracks, numerical analyses for this probe are handled simply by devising boundary condition. Aid of numerical analyses has enhanced the evaluation of complicated cracks.

Numerical analysis of eddy current testing by integral equation method

In eddy current analysis for the eddy current testing (ECT), it is essential to estimate the electromagnetic fields around cracks accurately because the fields contain information pertaining to the cracks. In order to obtain accurate solutions by the integral equation method, a method of eddy current analysis for ECT is proposed. In modeling the cracks, a crack element introduced. In order to check the effectiveness and adequacy of the proposed method, we solve the benchmark models of ECT and compare the numerical results with the experimental ones.

Numerical and experimental analysis of eddy current testing for a tube with cracks : Hashizume, H.; Yamada, Y.; Miya, K.; Toda, S.; Morimoto, K.; Araki, Y.; Satake, K.; Shimizu, N.; IEEE Transactions on Magnetics, Vol. 28, No. 2, pp. 1469–1472 (Mar. 1992)

Numerical and experimental analysis of eddy current testing for a tube with cracks : Hashizume, H.; Yamada, Y.; Miya, K.; Toda, S.; Morimoto, K.; Araki, Y.; Satake, K.; Shimizu, N.; IEEE Transactions on Magnetics, Vol. 28, No. 2, pp. 1469–1472 (Mar. 1992)

An analysis of eddy current testing with sheet current

The eddy current problem of recognizing a crack on the edge of a rivet hole is analyzed numerically by using the current vector potential method. The vertical field is induced by the disturbance of the sheet eddy current on a thin plate. The vertical field is evaluated for a visualization technique with magnetooptics. A vague image of a crack is improved by cancellation of signals of the rivet hole in the numerical analysis. >

Numerical and experimental analysis of eddy current testing for a tube with cracks

A novel method for calculating the impedance signal in eddy current testing (ECT) for a tube with surface cracks is developed using the two-dimensional current vector potential method. Three-dimensional current flow around a surface crack is approximated by introducing quasi-conductivity in the crack region. A final matrix relating the current vector 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. Numerical results show good agreement with the experimental ones, which indicates the validity of the proposed method and the possibility of designing a more efficient probe of ECT using the code.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Eddy current testing of anomalies in conductive materials. I. Qualitative imaging via diffraction tomography techniques

The authors consider the analysis of eddy current testing of defects in conductive materials. The authors investigate the application of reflection-mode diffraction tomography (DT) imaging techniques. First, exact synthetic data are calculated for various canonical configurations using a method of moments, and they are compared with those calculated by a finite-element code and with experimental data. Analysis of these data in particular evidences interest and some limitations of the Born approximation. Second, two imaging algorithms are proposed and investigated from numerical simulations; the first directly originates from ultrasonic DT where most of the attenuation is neglected, and the other approximately accounts for the skin effect. >