5/26/2023 0 Comments Crack accurate 5The crack width and depth are 2mm and 1.3mm respectively. ![]() ![]() The impedance of the coil is measured for different coil positions with -a step of 2 mm.įigure 2 - CAD model of simulated NDT exampleįigure 3 shows the geometrical parameters of the model. ![]() A parametric AC magnetic analysis is used to solve this example. Different crack sizes and excitation frequencies help to study the behaviour of the coil under several scenarios.EMS results are validated by experimental tests.īelow is the 3D model of a simulated probe. The crack on the plate is detected through a variation in the impedance of the coil. The example consists of conductor plate which is scanned by a coil. Flaw in the material causes variation in the electrical conductivity and magnetic permeability which changes the eddy current and the impedance ‘seen’ by the coil.įigure 1 - Eddy Current Testing principle Problem description The direction of the eddy current is such that its field opposes the flux created by the coil. The coil’s field induces eddy currents in the nearby conductive material. ![]() This coil produces an alternating magnetic field in the surrounding space. Its main applications is surface inspection, whose goal is detection of surface and sub-surface flaws in the specimen.Ī single-element ECT probe has a coil of conductive wire which is excited from an AC source. Electronic Design Automation & ElectronicsĮddy-current testing (ECT) is a non-destructive testing (NDT) method based on the electromagnetic induction.
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