scholarly journals Zero-group velocity modes in plates with continuous material variation through the thickness

2017 ◽  
Vol 141 (5) ◽  
pp. 3302-3311 ◽  
Author(s):  
Oskar Tofeldt ◽  
Nils Ryden
Keyword(s):  
Group Velocity ◽  
Zero Group ◽  
Continuous Material

Edge resonance and zero group velocity Lamb modes in a free elastic plate

2011 ◽  
Vol 130 (2) ◽  
pp. 689-694 ◽  
Author(s):  
M. Cès ◽  
D. Clorennec ◽  
D. Royer ◽  
C. Prada
Keyword(s):  
Group Velocity ◽  
Elastic Plate ◽  
Edge Resonance ◽  
Zero Group

scholarly journals Beam shaping to enhance zero group velocity Lamb mode generation in a composite plate and nondestructive testing application

2017 ◽  
Vol 85 ◽  
pp. 13-19 ◽  
Author(s):  
Frédéric Faëse ◽  
Samuel Raetz ◽  
Nikolay Chigarev ◽  
Charfeddine Mechri ◽  
James Blondeau ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Group Velocity ◽  
Composite Plate ◽  
Beam Shaping ◽  
Zero Group ◽  
Mode Generation ◽  
Lamb Mode

scholarly journals Characterization of Progressive Fatigue Damage in Solid Plates by Laser Ultrasonic Monitoring of Zero-Group-Velocity Lamb Modes

2018 ◽  
Vol 9 (6) ◽  
Author(s):  
Guqi Yan ◽  
Samuel Raetz ◽  
Nikolay Chigarev ◽  
Vitalyi E. Gusev ◽  
Vincent Tournat
Keyword(s):  
Group Velocity ◽  
Fatigue Damage ◽  
Ultrasonic Monitoring ◽  
Laser Ultrasonic ◽  
Zero Group

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.

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