An exact solution of the dynamical problem for the infinite elastic layer with a cylindrical cavity

Abstract

The wave field of an infinite elastic layer weakened by a cylindrical cavity is constructed in this paper. The ideal contact conditions are given on the upper and bottom faces of the layer. The normal dynamic tensile load is applied to a cylindrical cavity's surface at the initial moment of time. The Laplace and finite $sin-$ and $cos-$ Fourier integral transforms are applied successively directly to axisymmetric equations of motion and to the boundary conditions, on the contrary to the traditional approaches, when integral transforms are applied to solutions' representation through harmonic and biharmonic functions. This operation leads to a one-dimensional vector homogeneous boundary value problem with respect to unknown transformations of displacements. The problem is solved using matrix differential calculus. The field of initial displacements is derived after application of inverse integral transforms. The case of the steady-state oscillations was investigated. The normal stress on the faces of the elastic layer are constructed and investigated depending on the mechanical and dynamic parameters.