Communications - Scientific Letters of the University of Zilina 2015, 17(11):17-22 | DOI: 10.26552/com.C.2015.1A.17-22

Progress in Three-Dimensional Non-Destructive Assessment of Real Cracks from Eddy Current Testing Signals

Ladislav Janousek¹, Mihai Rebican², Milan Smetana¹, Anton Duca²

¹ Department of Electromagnetic and Biomedical Engineering, Faculty of Electrical Engineering, University of Zilina, Slovakia

² Faculty of Electrical Engineering, University Politehnica of Bucharest, Bucharest, Romania

Enhancement in three-dimensional non-destructive evaluation of real cracks from two-dimensional simulated eddy current testing signals is reported in the paper. A new uniform eddy current testing probe is employed for the inspection. All three spatial components of the perturbation electromagnetic field are acquired during two-dimensional scan of the probe. The ECT signals due to partially conductive cracks are simulated by a fast forward FEM-BEM solver using a database. Two crack models are proposed for the inversion using the tabu search stochastic method. The former model has a cuboid shape and the latter one reflects a more complex geometry. Numerical results of the three-dimensional reconstruction of partially conductive cracks from simulated two-dimensional signals are presented and discussed in the paper.

Keywords: non-destructive evaluation; eddy currents; partially conductive cracks; diagnosis; stochastic method; tabu search

Published: April 30, 2015  Show citation