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Potapov A.I.,Saint Petersburg State University | Syas'ko V.A.,OOO Konstanta | Pudovkin O.P.,National Mineral Resource University University of Mines
Russian Journal of Nondestructive Testing | Year: 2015

The problems of optimizing the magnetic system of primary measuring transducers that use the magnetic-flux leakage technology using the finite-element method are considered. The main calculation results and the development of transducers for testing pitting–corrosion flaws of petrochemical objects are presented. © 2015, Pleiades Publishing, Ltd. Source

Boyko G.,Volgograd State Technical University | Tujrin S.,Volgograd State Technical University | Fedotov V.,National Mineral Resource University University of Mines
Transport Problems | Year: 2015

The task of increase of traffic safety has got a special acuteness for large cities of Russia in connection with expansion of service of passengers of route taxis. In the paper results of research of technical operation's conditions of route taxis, qualifications and the experience of their drivers are resulted, and also some ways of increase of safety on city routing traffic are offered. Source

Brigadnov I.A.,National Mineral Resource University University of Mines
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 | Year: 2014

The boundary value problem of torsion of solid cylinder is analyzed for a class of hyperelastic materials that exhibit the power law type dependence of the strain energy density on the magnitude of the deformation gradient. The Saint Venant hypotheses are generalized by including the non-homogeneous longitudinal and radial deformations. A non-linear variational problem with respect to the function of the radial/surface deformation, the function of the longitudinal deformation, the normalized torque and the normalized axial force is formulated. The asymptotic analytical solutions are obtained for the hard device torsion and for large angles of twist. They illustrate the power law type dependencies of the axial force and the reaction torque on the angle of twist with the exponents p and p - 1, respectively. For Treloar (neo Hookean) materials with p = 2 the classical results can be obtained. The finite element analysis of the hard device torsion is performed by Matlab. The results indicate that for a homogeneous class of materials and large angles of twist non-homogeneous radial/surface deformation can be observed. Source

Argimbaev K.R.,National Mineral Resource University University of Mines | Ivanova M.A.,National Mineral Resource University University of Mines
Research Journal of Applied Sciences | Year: 2016

The results of the industrial experiment at the quarry of granite on gravel extraction have been presented; the investigation aim was to establish a relation of the strength properties on the rock mass fragmentations in the shotpile, taking into account the ruptured zone from the intension of explosive energy. © Medwell Journals, 2016. Source

Argimbaev K.R.,National Mineral Resource University University of Mines | Alexandrovich I.V.,National Mineral Resource University University of Mines
Research Journal of Applied Sciences | Year: 2016

This study describes the complex approach to study the formation process of the cumulative jet and the depth of its implementation into marble and granite in case of rock directional shattering by means of cumulative column charges. As a source of directional explosion we used a cumulative column charge in metal coating. In accordance with the values of measured depths after implementing the cumulative jet into rock plates we got numerical values of "initial" cavity scale depending on the focal distance for different charge types. We describe a model experiment aimed at the study of cumulative jet implementation mechanism and creation of stress concentrator (of the "initial" cavity). There is an X-ray picture here to show the process of implementing cumulative jet into a rock plate and there are results of lab experiments to study the depth of jet implementation at different focal distances. We show the scheme of interaction of separate cumulative jet fragments with the rock. It was revealed how the mass velocities in reflected shock wave for a jet rear side depend on the jet front side velocity for marble and granite. The connection of the implementation depth of the cumulative jet with the distance to the mass became clear. © Medwell Journals, 2016. Source

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