DISLOCATION STRUCTURES AND ACTIVE DEFORMABLE MEDIA

The relationship between dislocation and autowave models of plastic flow is established. It is shown that the activity of the deformed medium required for generating autowave processes of plastic deformation is provided by the dislocation structure of the medium. The relationship between the dispersion of autowaves and the stages of plastic flow and the dislocation structures observed at each of them is analyzed and explained. A mechanism for excitation of low-frequency autooscillations in a deformed medium due to the elastic interaction of dislocation ensembles with moving dislocations is proposed. The mutual complementarity of the autowave and dislocation approaches to the description of plasticity is discussed.