Experimental and numerical study of delamination detection in a WGF/epoxy composite plate using ultrasonic guided waves and signal processing tools

Document Type : Invited by Davoud Younesian


1 Graduate Student, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran

2 Assistant Professor, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran


Reliable damage detection is one of the most critical tasks in composite plate structures. Ultrasonic guided waves are acknowledged as an effective way of structural health monitoring (SHM). In this research, ABAQUS FE package is employed in order to develop a 3D finite element (FE) model to investigate the wave propagating features in a four-layer Woven Glass fiber (WGF) /epoxy composite plate. Dispersion curves have been extracted using semi-analytical finite element (SAFEM) in MATLAB. An experimental study has been done to obtain the sensitivity of the excitation frequency on the delamination detection problem. The Fast Fourier Transform (FFT), Butterworth filtering and the Continuous Wavelet Transform (CWT) signal processing methods have been utilized to extract a more accurate damage sensitive feature from experimental signals.
Calculations of amplitude reduction ratio (ARR) for both raw and filtered signals shows that increasing the excitation frequency, which means decreasing the wavelength, leads to increase in the ARR in an approximately linear manner for raw signals, while using the filtered signals for ARR extraction yields higher ARR, peaked at the tuned Lamb mode, which is F=330 kHz in the study. The Butterworth filtering provides larger damage sensitive feature compared to CWT method. Consequently, the ARR is a reliable and enough sensitive feature for delamination detection in composite plates, especially when extracted from filtered signals


  • Experimental delamination detection in composite plate is performed
  • Ultrasonic S0 Lamb mode is used as the inspection tool
  • FE simulation is carried out for mode excitation investigation
  • Butterworth filtering, Wavelet and Fourier transform are employed as signal processing tools
  • The Amplitude Reduction Ratio is extracted and quantified as damage sensitive feature


Main Subjects

[1] W.J. Staszewski, S. Mahzan, R. Traynor, Health monitoring of aerospace composite structures–Active and passive approach, composites Science and Technology, 69 (2009) 1678-1685.
[2] X. Yu, M. Ratassepp, Z. Fan, Damage detection in quasi-isotropic composite bends using ultrasonic feature guided waves, Composites Science and Technology, 141 (2017) 120-129.
[3] B. Yang, F.Z. Xuan, S. Chen, S. Zhou, Y. Gao, B. Xiao, Damage localization and identification in WGF/epoxy composite laminates by using Lamb waves: Experiment and simulation, Composite Structures, 165 (2017) 138-147.
[4] S. Sikdar, S. Banerjee, Identification of disbond and high density core region in a honeycomb composite sandwich structure using ultrasonic guided waves, Composite Structures, 152 (2016) 568-578.
[5] Z. Su, L. Ye, Y. Lu, Guided Lamb waves for identification of damage in composite structures: A review, Journal of sound and vibration, 295 (2006) 753-780.
[6] K. Jezzine, A. Lhémery, Simulation of Guided Wave Inspection Based on the Reciprocity Principle and the Semi‐Analytical Finite Element Method, in:  AIP Conference Proceedings, AIP, 2007, pp. 39-46.
[7] V. Giurgiutiu, Structural Health Monitoring with Piezoelectric Wafer Active Sensors: with Piezoelectric Wafer Active Sensors, Academic Press., 2007.
[8] L. Knopoff, A matrix method for elastic wave problems, Bulletin of the Seismological Society of America, 54 (1964) 431-438.
[9] P.E. Lagasse, Higher‐order finite‐element analysis of topographic guides supporting elastic surface waves, The Journal of the Acoustical Society of America, 53 (1973) 1116-1122.
[10] J. Moll, Damage localization in composite structures with smoothly varying thickness based on the fundamental antisymmetric adiabatic wave mode, Ultrasonics, 71 (2016) 111-114.
[11] H. Sohn, D. Dutta, J. Yang, H. Park, M. DeSimio, S. Olson, E. Swenson, Delamination detection in composites through guided wave field image processing, Composites science and technology, 71 (2011) 1250-1256.
[12] N.P. Yelve, M. Mitra, P. Mujumdar, Detection of delamination in composite laminates using Lamb wave based nonlinear method, Composite Structures, 159 (2017) 257-266.
[13] F. Li, H. Murayama, K. Kageyama, T. Shirai, Guided wave and damage detection in composite laminates using different fiber optic sensors, Sensors, 9 (2009) 4005-4021.
[14] M. Caminero, S. Pavlopoulou, M. Lopez-Pedrosa, B. Nicolaisson, C. Pinna, C. Soutis, Analysis of adhesively bonded repairs in composites: damage detection and prognosis, Composite Structures, 95 (2013) 500-517.
[15] C.A. Leckey, M.D. Rogge, F.R. Parker, Guided waves in anisotropic and quasi-isotropic aerospace composites: Three-dimensional simulation and experiment, Ultrasonics, 54 (2014) 385-394.
[16] O. Mesnil, C.A. Leckey, M. Ruzzene, Instantaneous and local wavenumber estimations for damage quantification in composites, Structural Health Monitoring, 14 (2015) 193-204.
[17] H. Shah, K. Balasubramaniam, P. Rajagopal, In-situ process-and online structural health-monitoring of composites using embedded acoustic waveguide sensors, Journal of Physics Communications, (2017).
[18] J.L. Rose, Ultrasonic guided waves in solid media, Cambridge university press, 2014.
[19] W. Chiu, L. Rose, N. Nadarajah, Scattering of the fundamental anti-symmetric Lamb wave by a mid-plane edge delamination in a fiber-composite laminate, Procedia Engineering, 188 (2017) 317-324.
[20] M.H. Soorgee, C.J. Lissenden, J.L. Rose, A. Yousefi-Koma, Defect sensitivity of piezoelectric strip transducers based on planar Lamb waves, Journal of Intelligent Material Systems and Structures, 25 (2014) 472-483.