Affiliations: [a] Associaz. EURATOM/ENEA/CREATE, DIMET, Università
degli Studi di Reggio Calabria, Via Graziella, Loc. Feo di Vito, I-89100 Reggio
Calabria, Italy | [b] Associaz. EURATOM/ENEA/CREATE, DAEIMI, Università
degli Studi di Cassino, Via Di Biasio 43, I-03043 Cassino (FR), Italy
Abstract: Linear and nonlinear numerical formulations for an efficient
solution of forward and inverse problems are summarized. The simulation tool is
based on an integral formulation in terms of a two-component current density
vector potential expanded over edge-elements. The methods are applied to the
numerical simulation of a magnetic field sensor as well as to the crack
simulation and detection via eddy current testing (ECT), comparing the results
to the experimental measurements. The class of problems treated includes both
thin and thick cracks in metallic plates, taking into account the possible
presence of leakage in the crack as well as magnetic materials. The inversion
of ECT data is carried out by means of genetic algorithms or methods, based on
algorithms developed for digital communications, that allow to reduce the
computational cost for the solution of the inverse problem.
Keywords: non-destructive evaluation, eddy current testing, computational electromagnetics, integral formulations, defect characterization, inverse problems
