Stiffness matrix determination of composite materials using lamb wave group velocity measurements

2013 ◽  
Author(s):  
O. Putkis ◽  
A. J. Croxford
Keyword(s):  
Composite Materials ◽  
Group Velocity ◽  
Lamb Wave ◽  
Stiffness Matrix ◽  
Wave Group ◽  
Velocity Measurements

Corrosion thickness gauging in plates using Lamb wave group velocity measurements

2001 ◽  
Vol 12 (8) ◽  
pp. 1287-1293 ◽  
Author(s):  
F Jenot ◽  
M Ouaftouh ◽  
M Duquennoy ◽  
M Ourak
Keyword(s):  
Group Velocity ◽  
Lamb Wave ◽  
Wave Group ◽  
Velocity Measurements ◽  
Thickness Gauging

Non-destructive determination of the stiffness matrix of a laminated composite structure with lamb wave

2020 ◽  
Vol 237 ◽  
pp. 111956 ◽  
Author(s):  
C. Yilmaz ◽  
S. Topal ◽  
H.Q. Ali ◽  
I.E. Tabrizi ◽  
A. Al-Nadhari ◽  
...  
Keyword(s):  
Composite Structure ◽  
Lamb Wave ◽  
Stiffness Matrix ◽  
Laminated Composite ◽  
Non Destructive

The Group Velocity Change in the Unidirectional Composite Materials

2007 ◽  
Vol 353-358 ◽  
pp. 1584-1586
Author(s):  
Sang Ho Rhee ◽  
Jeong Ki Lee ◽  
Jung Ju Lee
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Group Velocity ◽  
Lamb Wave ◽  
Propagation Velocity ◽  
Tensile Strain ◽  
Tensile Loading ◽  
Unidirectional Composite ◽  
Square Root ◽  
Velocity Change

The group velocity of the S0 mode of a Lamb wave under the first cut-off frequency is measured during the tensile loading for the unidirectional composite materials. The group velocity of the S0 mode has the characteristic of increasing with the strain. The propagation velocity of a wave is generally proportional to the square root of the ratio of the modulus to the density. The elastic modulus is considered as a constant as the stress linearly increases with the strain. The increase of the group velocity with the strain is caused by a decrease in the density. It is proposed that the measurement of the group velocity of the S0 mode is useful for making an evaluation of the tensile strain and of any degradation in the unidirectional composite materials.

ESTIMATION OF THOMSEN'S EPSILON AND DELTA IN A SINGLE CORE USING ULTRASONIC PHASE AND GROUP VELOCITY MEASUREMENTS

2019 ◽  
Author(s):  
Gabriel Gallardo-Giozza ◽  
D. Nicolás Espinoza ◽  
Carlos Torres-Verdín ◽  
Elsa Maalouf
Keyword(s):  
Group Velocity ◽  
Velocity Measurements
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