Experimental and numerical study of the excitability of zero group velocity Lamb waves by laser-ultrasound

2015 ◽  
Vol 138 (1) ◽  
pp. 242-250 ◽  
Author(s):  
Clemens M. Grünsteidl ◽  
István A. Veres ◽  
Todd W. Murray
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Numerical Study ◽  
Laser Ultrasound ◽  
Zero Group

Numerical study of S1 zero group velocity Lamb modes for nonlinear functionally graded materials

2016 ◽  
Vol 94 (11) ◽  
pp. 1189-1194 ◽  
Author(s):  
Mouldi Zagrouba ◽  
Mohamed Shili Bouhdima
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Numerical Study ◽  
Poisson Ratio ◽  
Functionally Graded ◽  
Convergence Criteria ◽  
Graded Materials ◽  
Graded Material ◽  
Zero Group ◽  
The Impact

This paper presents detailed theoretical investigation of the first-order symmetric zero group velocity (S1-ZGV) modes propagating in functionally graded material (FGM) plates. Governing equations for the Lamb waves are derived and the power series technique (PST) is employed to solve the recursive equations associated with any power law and its gradient coefficient. The convergence criteria relative to PST have been discussed. Then, the dispersion curves are obtained on the basis of PST. Additionally, the impact of the FGM base materials and the gradient coefficient on S1-ZGV frequency is investigated. Numerical results show that S1-ZGV frequency is comparatively more sensitive to the shear modulus than to the Lamé parameter λ. Additionally, the variations of S1-ZGV frequency as a function of the Poisson ratio of various FGM plates are clarified.

scholarly journals Multiple zero group velocity Lamb modes in an anisotropic plate: propagation along different crystallographic axes

2019 ◽  
Vol 97 (10) ◽  
pp. 1064-1074
Author(s):  
Soufien Karous ◽  
Souhail Dahmen ◽  
Mohamed Shili Bouhdima ◽  
Morched Ben Amor ◽  
Christ Glorieux
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Iodic Acid ◽  
Transverse Waves ◽  
Cutoff Frequencies ◽  
Crystallographic Planes ◽  
Zero Group ◽  
Crystallographic Axes ◽  
Symmetric And Antisymmetric Modes ◽  
Lamb Mode

This paper studies the propagation of symmetric and antisymmetric Lamb waves along a 1 mm thick iodic acid plate (HIO3) in the 1–50 MHz frequency range. The Lamb mode propagation along three crystallographic planes was theoretically investigated, for two mutually orthogonal propagation directions. Several frequencies were found that correspond to Lamb modes with zero group velocity (ZGV) and non-null phase velocity values. The first symmetric Lamb mode, S1, was found to possess only one ZGV point, regardless of the propagation direction; higher order symmetric and antisymmetric modes with up to four ZGV points were found, depending on the propagation plane. The dependence of the ZGV frequencies on each elastic constant (c11, c13, c33, c55) of the HIO3 plate material was also investigated by changing the constant values by 5% and 10%. It was found that c33 and c55 affect the number of the ZGV points, while c11 and c13 affect the frequency of the ZGV points. The existence and frequencies of the ZGV points are strongly dependent on the proximity of standing longitudinal and transverse waves at nearby cutoff frequencies.

scholarly journals Imaging gigahertz zero-group-velocity Lamb waves

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Qingnan Xie ◽  
Sylvain Mezil ◽  
Paul H. Otsuka ◽  
Motonobu Tomoda ◽  
Jérôme Laurent ◽  
...  
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Zero Group

Laser-based ultrasonic generation and detection of zero-group velocity Lamb waves in thin plates

2005 ◽  
Vol 87 (19) ◽  
pp. 194109 ◽  
Author(s):  
C. Prada ◽  
O. Balogun ◽  
T. W. Murray
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Thin Plates ◽  
Zero Group

scholarly journals Evaluation of disbonds at various interfaces of adhesively bonded aluminum plates using all-optical excitation and detection of zero-group velocity Lamb waves

2020 ◽  
Vol 112 ◽  
pp. 102249 ◽  
Author(s):  
Jakub Spytek ◽  
Aleksandra Ziaja-Sujdak ◽  
Kajetan Dziedziech ◽  
Lukasz Pieczonka ◽  
Ivan Pelivanov ◽  
...  
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Optical Excitation ◽  
Adhesively Bonded ◽  
All Optical ◽  
Aluminum Plates ◽  
Zero Group
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