Identification of modified Drucker-Prager yield condition and modeling of plasticized titanium raw material compaction
https://doi.org/10.17073/1997-308X-2016-2-22-29
Abstract
A computer simulation technique for the process of non-compact titanium raw material compaction is considered. The modified Drucker–Prager plasticity model is used to describe the rheological flow of strained material. It is shown that it is advisable to use an auxiliary curve based on the Bernoulli lemniscate for the identification of the accepted yield model with accuracy acceptable for engineering calculations. It allows reducing the number of experiments required to build piecewise smooth Drucker–Prager yield curve. Plastic deformation of representative volume element of titanium sponge screening in various stress-strain states was studied. The plasticizing effect related to the increase of plastic β-phase while hydrogen alloying was used to improve the formability of non-compact titanium raw materials. Based on theoretical and experimental studies, it was found that the hydrogen alloying provides a denser workpiece at constant temperature and compression force compared to the traditional compression technology of titanium sponge. It is shown that the uniformity of the relative density distribution in the axial section of the workpiece increases with the additional hydrogen alloying.
About the Authors
I. M. Berezin
IES RAS (Ural Branch);
Ural Federal University
Russian Federation
Russian Federation
PhD Eng. Sci., Researcher at the Laboratory of system simulation, 620049, Ekaterinburg, Komsomolskaya str., 34;
Senior Researcher, 620002, Ekaterinburg, Mira str., 19
A. V. Nesterenko
IES RAS (Ural Branch)
Russian Federation
PhD Eng. Sci., Researcher at the Laboratory of material micromechanics
Russian Federation
PhD Eng. Sci., Researcher at the Laboratory of material micromechanics
A. G. Zalazinskii
IES RAS (Ural Branch)
Russian Federation
Dr. Sci. (Eng.), Prof., Head at the Laboratory of system simulation
Russian Federation
Dr. Sci. (Eng.), Prof., Head at the Laboratory of system simulation
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Review
For citations:
Berezin I.M., Nesterenko A.V., Zalazinskii A.G. Identification of modified Drucker-Prager yield condition and modeling of plasticized titanium raw material compaction. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2016;(2):22-29. (In Russ.) https://doi.org/10.17073/1997-308X-2016-2-22-29
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