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Communication Dans Un Congrès Année : 2020

Characterization of orthotropic elastic tensor using lamb waves

Résumé

In structural design and structural health monitoring (SHM), characterization of elastic stiffness tensor is fundamental. However, reconstruction of stiffness coefficients is complex problem due to anisotropy and heterogeneity in the composite materials. In this study, to identify the stiffness parameters of orthotropic composite plate an inverse procedure is proposed by using lamb wave phase velocities. During the experiments, a small piezoelectric actuator with a broadband signal (0-200 kHz) and a 3D Infrared Scanning Laser Doppler Vibrometer used for excitation and measurement, respectively. The measurement data is converted into frequency-wavenumber domain by using 3D Fourier transform and dispersion curves of the A<sub>0</sub>, S<sub>0</sub> and SH<sub>0</sub> modes are extracted. As the forward model, third order shear deformation theory (ToSDT) is used and embedded in the inversion algorithm due to its accuracy and computational efficiency. Thanks to this approximate method, dispersion curves are calculated in less than a second which is crucial for the inversion procedure. Stiffness parameters are calculated by minimizing the error between three measured and the three calculated lamb wave modes. Finally, different heuristic optimization algorithms like surrogate optimization, particle swarm, genetic algorithm and simulated annealing are used and results are compared. The reconstructed stiffness properties of quasi isotropic composite plate are compared with values from literature, showing good agreement, with errors below 7 percent for all 9 stiffness parameters.
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Dates et versions

hal-03235483 , version 1 (24-06-2021)

Identifiants

Citer

Adil Han Orta, Joost Segers, Jeroen Vandendriessche, N.B. Roozen, Wim Van Paepegem, et al.. Characterization of orthotropic elastic tensor using lamb waves. Forum Acusticum, Dec 2020, Lyon, France. pp.3319-3326, ⟨10.48465/fa.2020.0909⟩. ⟨hal-03235483⟩

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