Anomalous Reflection of Acoustic Shock Pulse at a Solid-Solid Interface

Measurements of reflection using acoustic shock pulse are made at a solid-solid interface between specimens before and after annealing of the same material in order to develop anomalous reflection mechanism due to plastic deformation in the range of high sound intensity. This experiment is performed at room temperature, and the acoustic shock pulse used in the experiment is 15 to 150 bar in stress range and 20 μs in pulse duration. The reflection phenomenon is not observed for low intensity pulse. However, in the range of high intensity it is found that the reflection coefficient increases as the amplitude of stress increases and also as the annealing temperature increases. The analysis is made about the reflection phenomenon by means of a stress-strain relationship of the material deformed plastically by high intensity shock pulses. The reflection coefficients estimated analytically agree well with the experimental results.