The paper has studied the process of plastic deformation of powder metal materials via various numerical methods, in particular, the finite-element method. The calculation and experimental technique developed for determining the rheological characteristics of powder materials is performed according to the well-known mechanical characteristics of the material’s particles on the basis of analyzing the deformation of an idealized model of a powder body. We have considered an idealized model of the powder body, based on which we simulated the deformation process of an elementary cell shaped as a cube with a spherical particle surrounded with a faceted pore. The simulation results are in good agreement with the experimental data on the pressing of the AKB-2.5 powder material in a closed matrix. This means it is possible to use the developed calculation and experimental technique for determining the rheological characteristics of a powder body from the known yield point values of the particle material for simulating the consolidation processes of powder materials.