Scattering of Stress Waves by Inhomogeneities in Solid Propellant Materials.

摘要

The scattering and the attenuation of stress waves in solid propellant materials is examined. These phenomena are due to the fact the propellant is a nonhomogeneous material on the length scale equivalent to that of the size of the oxidizer particles. The analysis considers waves traveling in a semi-infinite,one-dimensional model and it is in two parts. The first part deals with the scattering of a sinusoidal wave and the results are given in terms of the mean square value of the scattered wave. The second portion of the analysis is concerned with the attenuation of a square pulse applied at the free end. Both of these analyses consider the nonhomogeneous properties to be random and characterized by a statistical model. The results for both types of waves show that the nonhomogeneous properties have an appreciable effect when the wave length of the waves approach the characteristic length of the nonhomogeneities. (Author)