Characteristics of wave processes in consolidated media taking into account contact conditions between particles of substance
The features of the formation of information signals during the propagation of elastic waves in a fine-grained consolidated medium are considered. An analytical expression for the wave impedance of bulk longitudinal and share waves, which is taken as the basis for calculating the phase velocities of effective longitudinal and share waves and the attenuation coefficients is obtained. The obtained expressions are analyzed using numerical estimates for the actual values of the parameters of ultrasonic waves and the physical and mechanical properties of the medium. A noticeable change in phase velocities and attenuation coefficients in consolidated media compared to monolithic ones has been shown, which should be taken into account when assessing the values of reflected and transmitted signals through the corresponding boundaries. The results of numerical estimates of the change in the reflection and transmission coefficients for longitudinal and transverse waves through the plane interface between monolithic and consolidated media are given on the example of the system "steel - granular metallurgical slag" depending on the frequency and value of the perforation coefficient, as a parameter of the microrough grain boundary of the slag filler.