Contact interaction of a piezoelectric actuator and elastic half-space

A analytical solution is obtained of the following contact problem: a piezoelectric actuator in the form of a thin infinite strip, placed on the surface of an elastic half-space, performs oscillations due to the action of an electric load, which excites surface and bulk waves. The behaviour of these waves at all points of the elastic body, and also the stress-strain state of the piezoelectric actuator, are investigated. As an example, a numerical calculation is made of the displacements of the acoustic waves of an elastic half-space of steel, excited by a piezoelectric actuator made of PZT-5 piezoelectric ceramics, and the stress-strain state of the piezoelectric actuator is also calculated. It is shown that the amplitudes of the surface and bulk waves depends very much on the oscillation frequency. The attenuation of acoustic waves with distance from the oscillation source both in the depth of the body and on its surface is investigated.