Vector-potential boundary-integral evaluation of eddy-current interaction with a crack

Limitations of eddy current testing in a fast reactor environment

“…The procedure for evaluating the impedance changes due to the cylindrical structure and due to flaws therein is given in [2] for the case of a coil interaction with the surface of a bore-hole. In dealing with the interaction with flaws one has a choice between treating the flaw using a hyper-singular/dipole kernel but for improved accuracy the calculations can be performed using classical/monopole kernel [10,11,12]. The results given in Fig.…”

Eddy current tube inspection using a rotary probe

“…The use of a hyper-singular kernel is likely to lead to errors in the numerical schemes typically adopted that make used of the moment method. In addition the calculations can be carried out by avoiding the classical kernel [13,14]. However, we do not usually look for high accuracy in NDE applications and hence the approach seems to provide an adequate level of precision in this context.…”

Prediction of Eddy-Current Probe Impedance Due to Surface Cracks in Ferromagnetic Steels

“…In the thin-skin regime, the current dipole density on the crack cau be related to the TM potential as follows [5):…”

“…The boundary condition at the crack mouth can be determined from an integral equation for the TM potential [5]:…”