Modelling of Mesomechanics of Portevin-Le Chatelier Effect by Relaxation Element Method

The low shear stability of the near-surface layer causes the development of shears in it along the conjugate direction of maximum tangential stresses. The coupling of near-surface layer with substrate causes periodical arising of transverse bending in it and stress connected with them. The later relax with generation of the bands which cause intermittent flow of deformed specimen. Such a scheme of adeformation of solid as a multilevel system allows to use for the simulation of intermittent flow relaxation element method REM [3]. The fundamental property of solid:" plastic deformation is accompanied by stress re­ laxation in the local volumes of loaded solid" is laid on the basis of the method. The details of the surface shears along the direction of maximum shear stresses can be described within the framework of plane-stress model, and the influence of the coupling between the surface layer with substrate defines the conditions for the evolution of surface shears. Simulation of the intermittent flow in such a statement of problem is performed