PROPAGATION OF SH-WAVES IN A LAYERED HALF-SPACE WITH A FRICTIONAL CONTACT INTERFACE

The propagation of SH waves in a layered half-space with a frictional contact interface is considered. The incident wave is assumed to be su fficiently strong so that friction may be broken, and the local slip m ay take place at the interface. In the stick zones, both the displacem ents and stresses are continuous, while in the slip zones, the Coulomb friction model is adopted. The mixed boundary conditions lead to recu rrence relations for the subcritical angle incidence or singular integ ral equations for the supercritical angle incidence. The extent and lo cation of slip zones, which are unknown before the solution of the pro blem, are determined. The local slip velocities and the interface shea ring tractions are calculated in detail for the subcritical angle inci dence. The results show that the solution of the problem is dependent on the frequency of the incident wave due to the presence of the chara cteristic length-the thickness of the elastic layer. It is also found that, in some situations, there exist four slip zones instead of two o ver one representative period. All these features are quite different from those for infinite media.