piecewise linear conditions of plasticity, dissipative ruptures, plastic compressibility, the Kulon-Moor pyramid.

In this work the conditions of occurrence and the spreading regularity of the elastoplastic waves in the medium, satisfying any piecewise linear condition of plasticity in cases of a side and an edge of a surface of fluidity are considered. The received results are applied to the behaviour analysis of dissipative ruptures in plastically compressed medium described by the Kulon-Moor pyramid.