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Ultrasonic Attenuation of Longitudinal Waves in Plastics

1961; American Institute of Physics; Volume: 32; Issue: 2 Linguagem: Inglês

10.1063/1.1735981

1520-8850

Michel Auberger, John S. Rinehart,

Material Properties and Processing

Hughes' pulse technique for measuring longitudinal velocities has been adapted and extended to measure attenuation of longitudinal waves in the frequency range from 250 to 1,000 kc. Data for attenuation in nepers per wavelength in six different plastics (Plexiglas, polystyrene, nylon 101, Formica XXN, polyethylene, and Teflon) are given for eight different frequencies ranging from 250 to 1000 kc. The results for Plexiglas and polystyrene are compared with results obtained previously by other methods. Attenuation in nepers per wavelength has been found to decrease when frequency increases for all plastics, except for Teflon, which shows a well-defined peak at about 700 kc.