Edge Crack Detection: A Theoretical and Experimental Study

Modeling Eddy Current Crack Signals of Differential and Reflection Probes

“…It is straightforward to tum the differential equations with the boundary conditions (6) into a set of boundary integral equations obtainable from the following Green's formulas [1][2][3]; (7) in each ferrite core, (8) in each metal object (part or core), and finally…”

“…The efforts of past several years have resulted in development of an eddy current model [1][2][3][4][5][6][7][8], using the boundary element method (BEM). As of last year, the BEM algorithm based on the Hertz potential approach [1][2][3] was shown to be effective in dealing with complex part and probe geometry [4][5][6], and particularly in modeling crack signals [7][8][9].…”

“…As of last year, the BEM algorithm based on the Hertz potential approach [1][2][3] was shown to be effective in dealing with complex part and probe geometry [4][5][6], and particularly in modeling crack signals [7][8][9]. Previously, the modeling capabilities were demonstrated mostly with absolute probes.…”

Eddy Current Flow Near an Edge: A Comparison between Stratton-Chu and Magnetic Potential Formulations

“…The last section is for concluding remarks. The validation of the computed results against experimental data will be discussed only briefly since the subject will be presented in another paper [5] .…”

A General Boundary Integral Equation Approach to Eddy Current Crack Modeling

“…By computing the solutions to the integral equations, outputs in the form of impedance changes due to flaws can be used to generate the POD. Previously, we have introduced a modified version of the Hertzian magnetic potential approach for eddy current probe design [1]- [3]. In those papers, it was shown that the formulation can be used to solve problems with arbitrary geometries including geometrical singularities such as edges and corners.…”