DETERMINING THE RHEOLOGICAL CHARACTERISTICS AND MODELING THE EXTRUSION OF POWDER AND POROUS MATERIALS. PART 1. POWDER BODY

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.