Kurinnyi V.P., Harkusha I.P., Musiienko S.P. Theoretical substantiation of the explosive crushing of particles of tungsten-cobalt alloys

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 147

Geoteh. meh. 2019, 147, 73-81

https://doi.org/10.1051/e3sconf/201910900045

THEORETICAL SUBSTANTIATION OF THE EXPLOSIVE CRUSHING OF PARTICLES OF TUNGSTEN-COBALT ALLOYS

¹Kurinnyi V.P., ¹Harkusha I.P., ²Musiienko S.P.

¹National Technical University Dnipro Polytechnic, ²Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC 622.235.5/.62      

Language: English

Abstract.

The article is aimed at improving the process of processing scrap and lump waste of tungsten-cobalt alloys. Tungsten carbide has high hardness and abrasion. Its crushing and grinding pieces of scrap requires a lot of energy. Pieces of VK hard alloy are heterogeneous in local strength. With quasistatic loading, single cracks occur connecting the least durable elements of the piece. At the same time, the equipment wears out significantly.

The mechanisms of the processes occurring during the explosive crushing and softening of pieces of solid tungsten-cobalt alloys are considered. The parameters of the stress field required for their effective destruction are recorded. It is shown in the work that at the considered pressures (p <10 GPa) a shock wave (SW) does not occur in VK alloys. A strong compression wave (SHS) occurs, which differs from the shock wave in that the parameters are pressure, density, mass velocity, entropy, etc. - Do not experience a jump at the wave front. The values of all SHS parameters decrease from the wave generation surface to its front. If we use the Theta formula for shock compressibility of a substance, then at pressures significantly exceeding the dynamic yield strength of a substance, one can use the equations for compression and rarefaction waves in gases or compressible liquids. In this case, the initial parameters of the SHS and HC coincide.

The estimation of the duration of the process of destruction in a given section of the explosive charge is carried out. A method is proposed for calculating the A and m coefficients in the Theta impact shock compressibility equation for tungsten-cobalt alloys and their value for the ТС8 alloy is obtained. The parameters of strong compression waves in the ТС8 alloy and steel at pressures in detonation products of 5 and 1 GPa are estimated in cases of perpendicular and tangential wave incidence on the surface of the piece. The processes occurring during an explosion in a steel pipe filled with explosives and lumpy waste of tungsten-cobalt alloy VK8 are considered. The analysis of the processes occurring in a steel pipe filled with explosives and pieces of ТС8 alloy was carried out. The work obtained the results needed by experimenters and explosives practitioners for developing designs of crushing charges for pieces of tungsten-cobalt alloys.

Keywords: tungsten-cobalt alloys, scrap and waste processing, explosive crushing.

 

REFERENCES

1. Stanyukovich, K. P., Baum, F. A., Shekhter, B. I., (2013). Phizika vzryva. Ripol Classic
2. Kurinnyі, V. P., Garkusha, I. P., (2012). Adiabatic equation for detonation products of explosives and explosion products with additives. Geo-Technical Mechanics, 104, 112–119

About the authors

Kurinnyi Volodymyr Pavlovych, Doctor of Technical Sciences (D. Sc.), Professor, Professor of Physics Department, National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Harkusha Ihor Pavlovych, Candidate of Physical and Mathematical Sciences(Ph. D), Professor, Head of Physics Department,  National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Musiienko Serhii Petrovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in Department of Rock Mechanics, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine(IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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