CORRELATION DEPENDENCES BETWEEN MECHANICAL PROPERTIES AND MAGNETIC PARAMETER OF THE 41СR4 STEEL

SANDOMIRSKII Sergey G., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Metallurgy in Mechanical Engineering, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

It is shown that the mechanical properties (relative yield strength σ_0,2, tensile strength σ_в, relative constriction ψ) and hardness HRC of the 41Cr4 (DIN) steel change monotonically when the tempering temperature T_о changes after quenching and closely correlate with each other. The linear regression equations are presented describing interrelations σ_0,2, σ_в and ψ on HRС of the 41Cr4 steel, calculation errors for them and correlation coefficients. It  is shown that the coercive force H_c of the 41Сr4 steel does not have an unambiguous dependence with its hardness HRC over the entire range of variation of T_о, and the relaxation magnetization of the 41Cr4 steel cannot be used for non-destructive testing of its hardness due to low measurement accuracy. For the magnetic structuroscopy of the 41Сr4 steel, parameter H_c1 is proposed, for the calculation of which its H_c and relation of the residual magnetization to the saturation magnetization is used. It is shown that the calculation results of H_c1 do not have a high relative error, clearly depend on T_о of the 41Сr4 steel in the practically important range of its change and are highly sensitive to changes in the hardness HRC of the 41Сr4 steel. The equation for the correlation dependence of HRC on the parameter H_c1 is given. This equation and the equations of dependence of σ_0,2, σ_в and ψ on HRС are used to build correlation dependences of σ_0,2, σ_в and ψ on the parameter H_c1. It is shown that the constructed dependencies can be used for non-destructive magnetic testing of the mechanical properties of the 41Сr4 steel in a practically important range of their variation.

medium-carbon alloyed steels, mechanical properties, hardness, nondestructive testing, magnetic structural analysis

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NONLINEAR DEFORMATION OF CIRCULAR SANDWICH PLATES WITH COMPRESSIBLE FILLER

STAROVOITOV Eduard I., D. Sc. in Phys. and Math., Prof., Head of the Department “Structural Mechanics”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

ZAKHARCHUK Yuliya V., Ph. D. in Phys. and Math., Senior Lecturer of the Department “Building technologies and constructions”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Here is the formulation of the boundary value problem on the bending of an elastoplastic three-layer circular plate with a compressible filler. To describe the kinematics of the package, the hypotheses of the polyline are accepted. For thin bearing layers, the Kirchhoff hypothesis is accepted. In a relatively thick lightweight filler, the Tymoshenko hypothesis is performed with a linear approximation of radial displacements and deflection along the layer thickness. The work of shear stresses and compression stresses is assumed to be small and is not taken into account. The physical equations of state in the bearing layers correspond to the nonlinear theory of elasticity. The inhomogeneous system of ordinary nonlinear differential equations of equilibrium is obtained by the Lagrange variational method. Boundary conditions are formulated. The solution of the boundary value problem is reduced to finding the four desired functions – the deflection of the lower layer; shear, radial displacement and compression function in the filler. These functions satisfy an inhomogeneous system of ordinary nonlinear differential equations. Here is the formulation of the boundary value problem on the bending of an elastoplastic three-layer circular plate with a compressible filler. To describe the kinematics of the package, the hypotheses of the polyline are accepted. For thin bearing layers, the Kirchhoff hypothesis is accepted. In a relatively thick lightweight filler, the Tymoshenko hypothesis is performed with a linear approximation of radial displacements and deflection along the layer thickness. The work of shear stresses and compression stresses is assumed to be small and is not taken into account. The physical equations of state in the bearing layers correspond to the nonlinear theory of elasticity. The inhomogeneous system of ordinary nonlinear differential equations of equilibrium is obtained by the Lagrange variational method. Boundary conditions are formulated. The solution of the boundary value problem is reduced to finding the four desired functions – the deflection of the lower layer; shear, radial displacement and compression function in the filler. These functions satisfy an inhomogeneous system of ordinary nonlinear differential equations.

nonlinear elasticity, three-layer circular plate, compressible filler, deformation

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MECHANISM OF FORMATION OF SURFACE MICROASPERITIES OF COATINGS WITH EDGE CUTTING MACHINING

CHIZHIK Sergei A., Academician of the NAS of Belarus, D. Sc. in Eng., Prof., First Deputy Chairman, Presidium of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, Chief Researcher, A.V. Luikov Heat and Mass Transfer Institute of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KHEIFETZ Mikhail L., D. Sc. in Eng., Prof., Deputy Academician-secretary of the Department Physical and Technical Sciences of the NAS of Belarus, Presidium of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, Chief Researcher, Open Joint Stock Company “NPO Center”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BORODAVKO Vladimir I., Director General, Open Joint Stock Company “NPO Center”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KLIMENKO Sergei A., D. Sc. in Eng., Prof., Deputy Director for Research, V. Bakul Institute for Superhard Materials of the NAS of Ukraine, Kiev, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KOLMAKOV Alexey G., Corresponding Member of the RAS, D. Sc. in Eng., Deputy Director for Research, Baikov Institute of Metallurgy and Materials Science of the RAS, Moscow, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PANIN Alexey V., D. Sc. in Eng., Prof., Head of the Laboratory, Institute of Strength Physics and Materials Science of Siberian Branch of the RAS, Tomsk, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

CHUGUI Yuriy V., D. Sc. in Eng., Prof., Research Supervisor, Technological Design Institute of Scientific Instrument Engineering of the Siberian Branch of the RAS, Hovosibirsk, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BATAEV Anatoliy A., D. Sc. in Eng., Prof., Rector, Novosibirsk State Technical University, Hovosibirsk, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BLUMENSTEIN Valeriy Yu., D. Sc. in Eng., Prof., Professor of the Department, T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KRECHETOV Andrey A., Ph. D. in Eng., Assoc. Prof., Rector, T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PREMENT Gennadiy B., Shop Foreman, OOO “Felokt-servis”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The reasons for the divergence between the calculated results of the height of the microasperities of the kinematic and geometric representations of the formation of the surface with the edge tool and their values obtained during machining are studied. The analysis of the formation of microasperities in the area of chip formation is made, and the mechanism of increment of their height is considered, due to the fact that not all of the processed material allowance is removed during cutting. Most of the material is removed in the form of chips, and a smaller part of  it flows around the back surface of the tool and pressed out into the top of the asperity. The promissing directions of  microasperities height control on the treated surface are determined, and it is proposed to develop and apply tools that reduce the value of the end cutting edge angle and increase the radius at the top, as well as tools that minimize plastic deformation of the treated material in front of the front surface. The complex of studies on the processing of  parts from materials with heterogeneous structure showed that the features of the structure limit the possibility of  technological quality control of the treated surface of products.

geometrical and physical and mechanical parameters of quality, edge cutting machining, formation of  surface microasperities, deformation of treated material

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ANALYTICAL AND EXPERIMENTAL DETERMINATION OF TIRE STIFFNESS AND TIRE DAMPING CAPACITY OF HEAVY DUMP TRUCK

VYGONNY Albert G., Ph. D. in Eng., Assoc. Prof., Leading Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHMIALIOU Aliaksei V., Ph. D. in Eng., Deputy Director General for Research, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KALESNIKOVICH Andrei N., Head of the Department of Computer Modelling and Virtual Testing, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

RAK Mikhail V., Deputy Chief Desighner, OJSC “BELAZ” – Management Company of Holding “BELAZ-HOLDING”, Zhodino, Republic of Belarus

ISPENKOV Sergey A., Ph. D. in Eng., Head of the Research and Design Department, OJSC “BELAZ” – Management Company of Holding “BELAZ-HOLDING”, Zhodino, Republic of Belarus

SHAKIN Roman V., Head of the Design Department, OJSC “BELAZ” – Management Company of Holding “BELAZ-HOLDING”, Zhodino, Republic of Belarus

A method for analytical and experimental determination of vertical tire stiffness and tire damping for a heavy dump truck is considered. Input data are experimental measurements of free vibrations of the heavy dump truck after crossing a single asperity. The method is based on the procedure for identifying the vertical tire stiffness and tire damping by comparing the experimental and analytical data obtained from the model. The results of approbation of the proposed method are given by example of the specific dump truck model by using Matlab/Simulink Software.

tire, heavy dump truck, method, stiffness, damping, free vibrations, experiment, model

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