The paper presents a study of the processes of plastic deformation of metallic materials using numerical methods, in particular, the finite element method. Computational and experimental adaptation of the rheological Druker-Prager model was performed, constructed in the ABAQUS software package for modeling deformation processes of powder materials in a wide range of change of density. The results of modeling the pressing process in a closed matrix, where the relative density of a powder body changes in a rather wide range (0.65-0.98), were compared with the experimental data, and showed that the model using a subprogram allows to obtain the results more precisely describing a current of powder material in comparison with the model without a subprogram. It is shown that the ABAQUS software package and Druker-Prager's model built in it allow to obtain more exact results than those obtained using the DEFORM (with the built-in POROUS model) and ANSYS/LS-DYNA (with the CAP GEOLOGIC model) software packages.