Electromagnetic Acoustic Transducer for Detection and Characterization of Hidden Cracks inside Stainless Steel Material
Keywords:Characterization of hidden cracks, FEM, NDE, Time-of-Flight, TLBO algorithm
Industrial structure are exposed to microstructural changes caused by fatigue cracking, corrosion and thermal aging. Generally, a hidden crack is very dangerous because it is difficult to detect by Non- Destructive Evaluation (NDE) techniques. This paper presents a new approach to estimate the hidden cracks dimensions inside a stainless steel plate based on the EMAT signal. The received signal by EMAT is simulated using the Finite Element Method (FEM). Then, the identification of the hidden crack sizes is performed via the combination of two techniques; the first one is the Time-of-Flight (ToF) technique which was applied to estimate the crack height by the evaluation of the difference between the ToF of the healthy form and the defective form. Then, the crack width is estimated by the solution of the inverse problem from the received signal based on a meta-heuristic algorithm called Teaching learning Based optimization (TLBO). The obtained results illustrate the sensitivity of the EMAT sensor to the variation of the crack sizes. Moreover, the quantitative evaluation of the cracks dimensions, show clearly the efficiency and reliability of the adopted approache.
P. Burrascano, S. Callegari, A. Montisci, M. Ricci, and M. Versaci, “Ultrasonic nondestructive evaluation systems: Industrial application issues,” Springer, pp. 1-4, 2015.
B. Helifa, M. Féliachi, I. Lefkaier, F. Boubenider, A. Zaoui, and N. Lagraa, “Characterization of surface cracks using Eddy current NDT simulation by 3D-FEM and inversion by neural network,” Applied Computational Electromagnetics Society Journal, vol. 31, no. 2, pp. 187-194, 2016.
J. Parra-Raad, P. Khalili, and F. Cegla, “Shear waves with orthogonal polarisations for thickness measurement and crack detection using EMATs,” NDT & E. Int., vol. 111, p. 102212, 2020.
M. Chelabi, T. Hacib, Y. Le Bihan, N. Ikhlef, H. Boughedda, and M. Mekideche, “Eddy current characterization of small cracks using least square support vector machine,” J. Phys. D: Appl. Phys., vol. 49, no. 15, 155303, 2016.
R. Ribichini, F. Cegla, P. Nagy and P. Cawley, “Study and comparison of different EMAT configurations for SH wave inspection,” IEEE Trans Ultrason Ferroelectr Freq Control, vol. 58, no. 12, pp. 2571-2581, 2011.
K. Mirkhani, C. Chris, M. Chris, J. Maciej, D. Tomas, S. Anthony, J. R. Shapoorabadi, K. Adalbert, and P. Marcello, “Optimal design of EMAT transmitters,” NDT & E. International, vol. 37, no. 3, pp. 181-193, 2004.
R. Dhayalan, A. Kumar, B. Rao, and T. Jayakumar, “A hybrid finite element model for spiral coil electromagnetic acoustic transducer (EMAT),” Int. J. Appl. Electromagn. Mech., vol. 46, no. 3, pp. 491-500, 2014.
R. Ludwig, Z. You, and R. Palanisamy, “Numerical simulations of an electromagnetic acoustic transducer-receiver system for NDT applications,” IEEE Trans. Magn., vol. 29, no. 3, pp. 2081-2089, 1993.
M. Hirao and H. Ogi, “An SH-wave EMAT technique for gas pipeline inspection,” NDT & E. Int., vol. 32, no. 3, pp. 127-132, 1999.
C. He, D. Peng, L. Yan, L. Xiucheng, L. Zenghua, J. Jingpin, and W. Bin, “Estimation of surface crack depth using Rayleigh waves by electromagnetic acoustic transducers,” Int. J. Acoust. Vibr., vol. 22, no. 4, 2017.
N. Yacef, T. Bouden, and M. Grimes, “Accurate ultrasonic measurement technique for crack sizing using envelope detection and differential evolution,” NDT & E. International, vol. 102, pp. 161-168, 2019.
H. Boughedda, T. Hacib, Y. L. Bihan, and H. Acikgoz, “Cracks characterization of non-ferromagnetic material using emat probe and PLSR technique,” PIER C. J., vol. 103, pp. 199-209, 2020.
C. Pei, S. Zhao, P. Xiao, and Z. Chen, “A modified meander-line-coil EMAT design for signal amplitude enhancement,” Sens. Actuators, A, vol. 247, pp. 539-546, 2016.
Z. Cai, Y. Yan, and G. Tian, “Enhancement of Lamb-EMAT signal using a modified one-side pitch-catch design,” IEEE Access, vol. 7, pp. 138556-138566, 2019.
C. Thring, S. Hill, S. Dixon, and R. Edwards, “The effect of EMAT coil geometry on the Rayleigh wave frequency behaviour,” Ultrasonics, vol. 99, p. 105945, 2019.
A. Habibpour-Ledari and F. Honarvar, “Three dimensional characterization of defects by ultrasonic time-of-flight diffraction (ToFD) technique,” J. Nondestr. Eval., vol. 37, no. 1, 2018.
H. R. E. H Bouchekara and M. Nahas, “Optimization of electromagnetics problems using an improved teaching-learning-based-optimization technique,” Applied Computational Electromagnetics Society Journal, vol. 30, no. 12, pp. 1341- 1347, 2015.
S. Wang, R. Su, X. Chen, L. Kang, and G. Zhai, “Numerical and experimental analysis of unidirectional meander-line coil electromagnetic acoustic transducers,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, vol. 60, no. 12, pp. 2657-2664, 2013.
R. Rao, V. Savsani, and D. Vakharia, “Teaching– learning-based optimization: A novel method for constrained mechanical design optimization problems,” Computer-Aided Design, vol. 43, no. 3, pp. 303-315, 2011.