Optimization of coupled Lamb wave parameters for defect detection in anisotropic composite three-layer with Kelvin-Voigt viscoelasticity using Legendre polynomial method

Legendre polynomial method which describes the structure and incorporates automatically the boundary conditions in constitutive and propagation equations is used to model acoustic wave cylindrical resonators. It is the first time this method is applied to study standing rather than propagative waves. The advantage of this approach is, in a unique formulation, to take into account electric sources. The analytical and numerical resolutions are presented to highlight the potentialities of the Legendre polynomial approach. The vibration characteristics of piezoelectric discs with regard to diameter to thickness D/H ratios are analyzed by the three dimensional modeling approach through both modal and harmonic analyses. Resonance and antiresonance frequencies, electric input impedance, dispersion curves, field profiles and electromechanical coupling coefficient, easily obtained, are presented for PZT5A resonator piezoelectric discs. To validate our approach, the results using our 3D polynomial modelling of acoustic wave resonator are compared with those obtained by an approximated analytical method. The developed software proves to be very efficient to retrieve the radial modes of all orders.

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Study of the influence of semiconductor material parameters on acoustic wave propagation modes in GaSb/AlSb bi-layered structures by Legendre polynomial method

Physica B Condensed Matter ◽

10.1016/j.physb.2016.05.030 ◽

2016 ◽

Vol 496 ◽

pp. 82-91 ◽

Cited By ~ 9

Author(s):

Cherif Othmani ◽

Farid Takali ◽

Anouar Njeh ◽

Mohamed Hédi Ben Ghozlen

Keyword(s):

Wave Propagation ◽

Acoustic Wave ◽

Legendre Polynomial ◽

Layered Structures ◽

Semiconductor Material ◽

Polynomial Method ◽

Acoustic Wave Propagation ◽

Material Parameters

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Lamb-Wave Based Damage Detection in Anisotropic Composite Plates

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.627.1 ◽

2014 ◽

Vol 627 ◽

pp. 1-4 ◽

Cited By ~ 10

Author(s):

Z. Sharif-Khodaei ◽

M.H. Aliabadi

Keyword(s):

Damage Detection ◽

Lamb Wave ◽

Lamb Waves ◽

Composite Plates ◽

Detection Algorithm ◽

Damage State ◽

Anisotropic Composite ◽

Cfrp Composite ◽

The Difference ◽

Imaging Algorithms

Damage detection in anisotropic composite plates based on Lamb wave technique has been investigated. A network of transducers is used to detect barely visible damage caused by impact. A CFRP composite plate has been impacted and tested to verify the proposed damage detection algorithms. The difference in the propagational properties of Lamb waves in the pristine state and the damage state is used through data fusion and imaging algorithms to detect, locate and characterise the damage. The influence of directionality of the velocity on the validity of the detection algorithm is examined and some results are presented.

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