Sound damping by sound in polycrystalline zinc

摘要

The results of experimental investigations of the nonlinear damping of weak ultrasound pulses under the action of a powerful low-frequency wave in non-annealed and annealed polycrystalline zinc resonating rods are presented. The measurements were carried out at the first four longitudinal rod modes, and the frequency of the pulses changed from 40kHz to 1MHz. It is proposed to modify the Granato-Lucke dislocation theory to explain the observed amplitudes and frequency dependencies of the nonlinear damping coefficient of the ultrasound pulses.