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In this work, a parametric study is carried out on carbon fiber-reinforced plastic (CFRP) materials to investigate how the spatially varying fiber distribution influences the measured signal in an eddy current testing (ECT) configuration. The measurement setup was modeled using finite element method, while the fiber distribution is taken into account by an inhomogeneous anisotropic conductivity tensor. The study revealed a trade-off relation between the size of the ECT coil and the maximal dynamic range of the ECT signal, which contributes to the understanding of the connection between the fiber arrangement and the ECT signal and provides an opportunity for optimal ECT coil design. [ABSTRACT FROM AUTHOR]

Scattering from propellers is investigated using the 3D Finite Element Method (FEM), alongside a simpler integral equation (IE) method using 1D discretization. It is shown that under certain conditions and near the propellers' resonant frequency, results using the two methods are in agreement, justifying the use of the IE method; this is advantageous because of smaller computation times, and for providing a physical insight to the scattering phenomena at hand. Anechoic chamber measurements are performed to validate the numerical results. [ABSTRACT FROM AUTHOR]

Abstract: A combination of the boundary integral (BIM) and finite element (FEM) methods is presented for the calculation of the signal induced by small cracks. This approach—by preserving the attractive properties of both methods—allows considering a large variety of probe structures while the computation time remains low, especially if the signal of a complete scan is calculated. To validate the calculation results, experiments are carried out using a large number of minute cracks. The good agreement obtained between the measured and calculated data shows the applicability of the presented method. [Copyright &y& Elsevier]

Eddy current testing (ECT) probe signal due to cracks can be predicted by separating the calculation steps to the evaluation of the incident field and the reaction of the crack. Finite element (FEM) and boundary integral (ElM) methods can be, for example, advantageously applied for the calculation of the incident and reaction fields, respectively. The computational environment presented in this paper allows the blending of the different calculation methods for the purpose of ECT probe signal calculation. As a result, a fast and versatile tool is obtained to calculate the signal of complicated ECT probes due to cracks. The developed approach is validated through comparisons with experimental data. [ABSTRACT FROM AUTHOR]