Experimental-column method for determining porosity functions during plastic deformation of powder preparations based on iron
DOI:
https://doi.org/10.37142/2076-2151/2025-1(54)62Keywords:
porous body, deformation, porosity function, pressure treatment, cold plastic deformation, flow curve, stresses, deformations.Abstract
Sivak R., Polishchuk L. Experimental-column method for determining porosity functions during plastic deformation of powder preparations based on iron
The need of industry to obtain products with the required operational characteristics has led to the emergence and development of new technological processes for pressure treatment of pre-sintered porous materials. When studying the processes of plastic deformation of porous bodies, great importance is attached to the determination of porosity functions. The article presents a method for describing the mechanical characteristics of porous bodies by single functions. This method is based on the basic principles of the mechanics of plastic deformation of porous bodies and allows obtaining reliable porosity functions for a given material by refining theoretical functions by experimental studies. At the same time, experimental data were obtained in experiments on axisymmetric settlement of cylindrical samples without friction at the ends. Based on the theoretical studies conducted, porosity functions for iron-based materials were obtained. Iron-based samples of five different initial porosities were used for the studies. As a result of processing the experimental data, final expressions for the porosity functions of the workpiece material based on iron powder were obtained. The article also presents a method for calculating the accumulated deformation of the base material. Flow curves for iron-based powder materials have been constructed.
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