General theory of isothermic elastic-plastic deformation of polycrystals. [Preliminary communication]

summary:The presented theory is based on the analysis of micro-stresses. The mateis supposed to be composed of micro-volumes of several basic simple materials, which all are ideal-elastic-plastic of Reuss' type, with different parameters. The expressions for macroscopic moduli in elastic state and the incremental stress-strain relations for plastic state are obtained. This relations are depending on the instant values of micro-stresses and the instant values of micro-stresses are depending on the plastic-strain history