Title :
An experimental investigation of Lamb waves in a PVDF sheet
Author :
Bao, X.Q. ; Varadan, V.V. ; Varadan, V.K. ; Tancrell, R.H.
Author_Institution :
Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA, USA
Abstract :
The propagation characteristics of the fundamental symmetric Lamb waves in a thick (0.5-mm) voided PVDF (polyvinylidene chloride) sheet wave studied experimentally. Broad-bandwidth Lamb waves were generated and received by interdigital transducers. By using the FFT (fast Fourier transform) technique, the phase velocity and attenuation of the Lamb waves along the 1-axis (stretch direction) and 2-axis were measured as a function of frequency. The results show that the attenuation in the measuring range are approximately proportional to 1.33 power of frequency. The velocities of the waves along both axes increase with frequency. From the measured data, two complex planar stiffness constants of PVDF were calculated
Keywords :
acoustic wave absorption; acoustic wave propagation; acoustic wave velocity measurement; polymers; surface acoustic waves; 0.5 mm; FFT; PVDF sheet; acoustic wave propagation; acoustic wave velocity; attenuation; attenuation measurement; broad bandwidth waves; complex planar stiffness constants; fast Fourier transform; frequency; fundamental symmetric Lamb waves; interdigital transducers; phase velocity; polyvinylidene chloride; stretch direction; Acoustic measurements; Attenuation measurement; Bandwidth; Frequency measurement; Phase measurement; Polymers; Transducers; Transmitters; Underwater acoustics; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49392
