Beschreibung:
<jats:p>The propagation of surface acoustic waves at the boundary of an elastic bimodulus medium is described. The developed model of medium allows to describe acoustic phenomena with non-classical nonlinearity with amplitude-dependent threshold effects, caused by the presence of internal structure such as cracks or polymeric chains. The temporal profile of the surface wave is built. It is shown that this profile in the bimodulus medium is fundamentally asymmetric. This leads to the formation of the unipolar limit profile at large distances.</jats:p>