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Tomsk, Russia

Ivanova O.V.,Tomsk Scientific Center | Zelepugin S.A.,Tomsk State University | Yunoshev A.S.,Lavrentyev Institute of Hydrodynamics | Sil'vestrov V.V.,Lavrentyev Institute of Hydrodynamics
Eurasian Chemico-Technological Journal

We have conducted experimental and numerical research in twoand three-component solid mixtures placed into a cylindrical recovery ampoule under explosive loading. Behavior of the mixture is described by a mathematical model of a multicomponent medium. In the model, every component of a mixture simultaneously occupies the same volume as the mixture. Components interact with each other, exchanging momentum, energy, and mass (if the chemical reaction between the components occurs). An equality of components’ pressure is chosen as a condition for joint deformation of components. Finite element method is used for solving the problems. We considered experimentally and numerically explosive loading of the aluminum-sulfur mixture, and explosive compaction of the aluminum-sulfur-carbon mixture in a cylindrical steel ampoule. The inert substance (graphite) was added to the mixture to avoid the reaction between aluminum and sulfur. Most of the focus is on simulating the action of explosion products on the ampoule. In e computations the actions of the detonation products surrounding the ampoule was simulated by the action of pressure on the upper part of the ampoule in a vertical (axial) direction and on the lateral surface of the ampoule in a horizontal (radial) direction. We varied the thickness of the explosive that acts on the upper part of the ampoule in the axial direction in order to study the influence of the parameter on a final shape and size of the ampoule. We founded the essential influence of the thickness of the explosive layer on the final result of explosive compaction. Insufficient thickness of explosives, as well as the excessive thickness may be a reason for an incompletely compacted final product or lead to the formation of cracks or damage. © 2014 Al-Farabi Kazakh National University. Source

Zelepugin S.A.,Tomsk State University | Zelepugin A.S.,Tomsk Scientific Center
11th World Congress on Computational Mechanics, WCCM 2014, 5th European Conference on Computational Mechanics, ECCM 2014 and 6th European Conference on Computational Fluid Dynamics, ECFD 2014

The processes of high-velocity interaction of a projectile with a metal-intermetallic laminate (MIL) target were numerically investigated in axisymmetric geometry using the finite element method. To numerically simulate the failure of the material under high velocity impact, we applied the active-type kinetic model determining the growth of microdamages, which continuously changes the properties of the material and induce the relaxation of stresses. The strength characteristics of the medium (shear modulus and dynamic yield strength) depended on temperature and the current level of damage. The critical specific energy of shear deformations was used as a criterion of the erosion failure of the material that occurs in the region of intense interaction and deformation of contacting bodies. To simulate the brittle-like failure of the intermetallic material under high velocity impact, we modified the kinetic model of failure and included the possibility of failure above Hugoniot elastic limit (HEL) in the shock wave and sharp drop in strength characteristics if the failure begins. In the computations, the target consisting from intermetallic Al3Ti-titanium alloy Ti-6-4 layers has been used. The results show that the depth of penetration depends on the thicknesses of intermetallic and titanium alloy layers. The composite target withstands the impact loading in the case of the ratio about 4/1 (Al3Ti / Ti-6-4). Source

Maksimov Y.M.,Tomsk Scientific Center | Lapshin O.V.,Tomsk Scientific Center
Russian Journal of Physical Chemistry B

The modes of spin gasless combustion of plate- and disk-shaped Ti–2B–Cu samples are investigated using frame-by-frame filming. The combustion process takes place under unsteady conditions. An increase in the diameter of the reaction sample makes the pattern of movement of the reaction front more complicated. © 2015, Pleiades Publishing, Ltd. Source

Solovyev A.A.,Tomsk Polytechnic University | Rabotkin S.V.,Institute of High Current Electronics | Shipilova A.V.,Institute of High Current Electronics | Kirdyashkin A.I.,Tomsk Scientific Center | And 5 more authors.
International Journal of Hydrogen Energy

Metal-supported solid oxide fuel cells are considered as next generation of fuel cells. In this configuration, the use of metal support allows lowering the cost of fuel cell fabrication and provides enhanced durability. The paper presents the results concerning the manufacture and research of metal-supported solid oxide fuel cells with YSZ (yttria-stabilized zirconia) electrolyte. As a metal support the porous Ni-Al plates manufactured by combustion synthesis were used. The effects of synthesis conditions and composition of the Ni-Al samples on their properties were investigated. Solid oxide fuel cells with the structure of Ni-YSZ anode/YSZ electrolyte/LSCF cathode were fabricated by the combination of screen printing, magnetron sputtering, and electron beam treatment. The cell performance was analyzed by current-voltage measurements during operation at 700, 750, 800 and 850 °C. The obtained results are very promising at such an early stage of research for the future development of this technology. © 2015 Hydrogen Energy Publications, LLC. Source

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