Abstract
Lamb wave propagation in thin films of polyvinylidene fluoride PVF2 is examined as a function of temperature. Results are presented for frequencies from 10 to 70 MHz and temperatures from −50 to −175 °C. Lamb waves were excited in the 28.4-μm-thick films by interdigital transducers with a center frequency wavelength of 92 μm. At the fundamental wavelength, the first five Lamb modes were observed, while at the third harmonic of the transducer only the first two branches of the dispersion curves could be detected. The observed velocities of the seven modes are compared to the theoretical dispersion curves to obtain stiffness constants for the PVF2 film as a function of temperature. The results obtained for constants c33 and c55 are in agreement with previous literature. Values for the constants c11 and c13 are presented for the first time.
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