Effect of scattering of elastic harmonic waves in the far zone by a spatial crack

A three-dimensional wave field formed owing to diffraction of low-frequency waves on a curved crack in an infinite elastic solid at a large distance from the defect is studied by the method of boundary integral equations. Direction diagrams of the scattered field versus the excentricity of the crack surface and wavenumber are obtained for different directions of incidence of planar longitudinal waves onto a gently sloping spheroidal crack.