Investigation of Material Properties by Acoustic Methods on the Base of Inelastic Mechanical Processes

Abstract

Nonelastic mechanical behaviour of a material is determined by the kinetics of load-activated processes of variation of the initial structure, more particularly, by movements of atoms between locally stable equilibrium positions along a self-agreed potential relief. As a rule, the change of atomic structure in that case reduces to the formation and subsequent synchronous transfer of a plurality of atoms of given types with retention of the short-range order. Such a stable atomic structure, a defect, can be regarded as a single quasi-particle. In terms of defective structure, the state of material is uniquely determined by the distribution of defects of various types and the mechanism of macro behaviour of the material under load is determined by the dynamics of formation and transfer of defects.