scholarly journals Determination of thickness and bulk sound velocities of isotropic plates using zero-group-velocity Lamb waves

2018 ◽  
Vol 112 (25) ◽  
pp. 251905 ◽  
Author(s):  
Clemens Grünsteidl ◽  
Thomas Berer ◽  
Mike Hettich ◽  
István Veres
Keyword(s):  
Group Velocity ◽  
Lamb Waves ◽  
Isotropic Plates ◽  
Zero Group ◽  
Sound Velocities

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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