Characterization of Surface Cracks Using Eddy Current NDT Simulation by 3D-FEM and Inversion by Neural Network
Keywords:
3D finite element simulation, eddy current NDT, neural network, surface cracksAbstract
In this work, we suggest an approach of signal inversion from sensors used in eddy current (EC) nondestructive testing (NDT). The aim is to characterize surface cracks from the EC signal. A methodology that combines 3D finite element (FEM) simulation and a data inversion by neural networks (NN) is proposed. We show that the use of a set of numerical measurements representing the EC signature of surface crack enables to remedy of the unicity problem. The obtained results show that the developed approach leads to the quantification of the crack.
Downloads
References
B. Helifa, A. Oulhadj, A. Benbelghit, I. K. Lefkaier, F. Boubenider, and D. Boutassouna, “Detection and measurement of surface cracks in ferromagnetic materials using eddy current testing,” NDT&E International, Elsevier, vol. 39, issue 1, pp. 384-390, Mar. 2006.
Y. Le Bihan, J. Pavo, and C. Marchand, “Characterization of small cracks in eddy current testing,” Eur. Phys. J. Appl. Phys., 43, pp. 231- 237, 2008.
D. Prémel and A. Baussard, “Eddy-current evaluation of three-dimensional flaws in flat conductive materials using a Bayesian approach,” Institute of Physics Publishing, Inverse Problems 18, pp. 1873-1889, 2002.
G. Rubinacci, A. Tamburrino, and S. Ventre, “Regularization and numerical optimization of a fast eddy current imaging method,” IEEE Transactions on Magnetics, vol. 42, no. 4, pp. 1179-1182, Apr. 2006.
B. Helifa, A. Zaoui, M. Feliachi, I. K. Lefkaier, F. Boubenider, and A. Cheriet, “Simulation du CND par courants de Foucault en vue de la caractérisation des fissures débouchantes dans les aciers austénitiques,” 6 ème Conférence Européenne sur les méthodes numériques en Electromagnétisme NUMELEC, Liège – Belgique, Déc. 2008.
X. Qiu, P. Zhang, J. Wei, X. Cui, C. Wei, and L. Liu, “Defect classification by pulsed eddy current technique in con-casting slabs based on spectrum analysis and wavelet decomposition,” Sensors and Actuators A: Physical, 20, pp. 272-281, 2013.
R. Smid, A. Docekal, and M. Kreidl, “Automated classification of eddy current signatures during manual inspection,” NDT&E International, vol. 38, pp. 462-470, 2005.
L. Udpa, P. Ramuhalli, J. Benson, and S. Udpa, “Automated analysis of eddy current signals in steam generator tube inspection,” 16th WCNDT World Conference on NDT, Montreal, Aug. 30 – Sep. 3, 2004.
G. Chen, Y. Yoshida, K. Miya, and M. Uesaka, “Application of eddy current testing inspection to the first wall of fusion reactor with wavelet analysis,” Fusion Engineering and Design, 29, pp. 309-316, 1995.
Team Workshop Problem 15, Rectangular Slot in a Thick Plate: a Problem in Nondestructive Evaluation, http://www.compumag.org/jsite/images/stories/T EAM/problem15.pdf.
M. Rachek and M. Féliachi, “3-D movement simulation techniques using FE-methods: application to eddy current non-destructive testing,” NDT&E international, Elsevier, vol. 40, issue 1, pp. 35-42, Jan. 2007.
C. Geuzaine, Meshing Software, www.geuz.org/gmsh.
B. Bendjima, K. Srairi, and M. Féliachi, “A coupling model for analysing dynamical behaviors of an electromagnetic forming system,” IEEE Transactions on Magnetics, vol. 33, no. 2, pp. 1638-1641, Mar. 1997.
Z. Chen, M. Rebican, N. Yusa, and K. Miya, “Fast simulation of ECT signal due to a conductive crack of arbitrary width,” IEEE Transactions on Magnetics, vol. 42, no. 4, pp. 683-687, Apr. 2006.
Ph. Beltrame and N. Burais, “Generalization of the ideal crack model in eddy-current testing,” IEEE Transactions on Magnetics, vol. 40, no. 2, pp. 1366-1379, Mar. 2004.
N. Yusa, W. Cheng, Z. Chen, and K. Miya, “Generalized neural network approach to eddy current inversion for real cracks,” NDT&E International 35, pp. 609-614, 2002.
