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Abstract

This paper presents numerical simulation results of eddy current signals to determine the appropriated dimensions of imitative stress-corrosion cracks (SCCs) in viewpoint of similar eddy current testing signals. The imitative SCCs were modelled as multiple tiny slits in three dimensions. A Finite Element and Boundary Element hybrid method (FEM-BEM) was utilized to simulate the eddy current signals in an impedance form of an absolute pancake coil. Equivalent conductivity ( $\sigma_{E}$ ) of the imitative SCCs was estimated by using a uniform notch model at a fixed width of 0.2 mm, and adjusting the conductivity in the notch region. According to the numerical results, the impedance amplitude could be significantly used to quantify the $\sigma_{E}$ of imitative SCCs. In addition, the variation of test frequency affecting to $\sigma_{E}$ value was investigated. Finally, the appropriated imitative SCCs dimensions for the eddy current testing were quantitatively predicted by using a statistical methodology.

Keywords

Stress corrosion cracks imitative SCC eddy current testing FEM-BEM

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A numerical study on eddy current signal characteristics of imitative stress corrosion cracks

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