关键词: initial stress, Love waves, Gibson’s half-space, phase velocity, dispersion equation, heterogeneous half-space

Abstract:

The paper studies the propagation of Love waves in a non-homogeneous substratum over an initially stressed heterogeneous half-space. The dispersion equation of phase velocity is derived. The velocities of Love waves are calculated numerically as a function of kH and presented in a number of graphs, where k is the wave number, and H is the thickness of the layer. The case of Gibson’s half-space is also considered. It is observed that the speed of Love waves is finite in the vicinity of the surface of the half-space and vanishes as the depth increases for a particular wave number. It is also observed that an increase in compressive initial stresses causes decreases of Love waves velocity for the same frequency, and the tensile initial stress of small magnitude in the half-space causes increase of the velocity.

Key words: dynamic fracture, stress intensity factor, crack propagation, anisotropy, Love waves, phase velocity, heterogeneous half-space, dispersion equation, Gibson’s half-space, initial stress