Propagation of elastic waves in cross-sectionally heterogeneous rods

Abstract The article is devoted to measuring the propagation speed of elastic waves in metal rods of variable cross-section. The paper examines the dependence of the speed measure of propagation of elastic waves on the geometric and physical characteristics of the rods. The research methods are based on the use of known statements of the impact theory during the collision of a ball with the end of a metal rod. Solid rods, stepped rods, and rods with axisymmetric holes of different depths were experimentally studied. A piezo sensor connected to a digital oscilloscope was used to record pressure fluctuations at the end of the rod. The method of least squares was used for processing and further analysis of experimental data. Theoretical and experimental studies proved that there are two characteristic areas in which the speed of propagation of an elastic wave in a non-homogeneous cross-sectional rod differs from the value of the wave speed in a one-dimensional rod. A sinusoidal functional dependence of the propagation speed of the elastic wave on the caliber of the rod was obtained.