RT Journal Article
T1 Elastic constants determination by direct measurement of the beat wavelength between A0 and S0 Lamb modes with pulsed TV holography
A1 Fernández Fernández, José Luis
A1 Deán Ben, José Luis
A1 Trillo Yáñez, María Cristina
A1 Fernández Doval, Ángel Manuel
K1 3311.11 Instrumentos Opticos
K1 2209.07 Holografía
K1 2201.09 Ultrasonidos
AB A whole-field optical technique of high sensitivity, namely pulsed TV holography with phase evaluation by the Spatial Fourier Transform Method, is applied to the acquisition of instantaneous displacement fields of ultrasonic Lamb waves in aluminium plates a few millimetres thick. Two Lamb modes, the A0 and S0 ones, are simultaneously generated in the plate, producing a clear beating. Several values of the beat wavelength, corresponding to different excitation frequencies, are obtained by direct measurement of the distance between nodes in the wave field. The obtained values are fitted to the theoretical RayleighLamb frequency spectrum in order to determine the elastic constants of the plate material. We conclude that it is necessary to know the value of another parameter to univocally solve the problem, and so the bulk longitudinal wave velocity is measured by the pulse-echo method. Then the Poisson's ratio is obtained and, from these two parameters, the Young's modulus can also be determined.
PB Optics and Lasers in Engineering
SN 01438166
YR 2007
FD 2007-05
LK http://hdl.handle.net/11093/995
UL http://hdl.handle.net/11093/995
LA eng
NO Optics and Lasers in Engineering, 45(5): 618-630 (2007)
NO Ministerio de Ciencia y Tecnología y Comisión Europea (FEDER) | Ref. DPI2002-04412-C03-01
DS Investigo
RD 10-oct-2024