Ultrasonic Wave Propagations in Non-Homogeneously and Dynamically Deformed Isotropic Elastic Materials

Abstract

The thermodynamical investigations of the wave propagation superposing on the nonhomogeneously and dynamically deformed isotropic elastic material are discussed. The expansion forms of the free energy and of the wave deformation are determined by the characters of the isotropic tensors. The wave propagation equations are deduced for three superposed states : isothermal, isentropic and middle. The stress-acoustical law holds, that is, the phase difference of two polarized shear waves is proportional to the stressdifference and the wave frequency.