Ìåæäóíàðîäíûé íàó÷íûé æóðíàë
Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü
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ÒÐÅÍÈÅ È ÈÇÍÎÑ Ìåæäóíàðîäíûé íàó÷íûé æóðíàë Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü |
Summary: It has been studied how various shapes (elliptical, parabolic or oscillating) how the distribution of the friction heat flow over a portion of the semispace surface affect the stress-strain state bear the crests of the internal section.
Zav'yalov O. G., Markov Yu. G.
Study of the dynamics of a sphere rolling over the surface with an unsteady viscous fluid layer. pp. 120--129
Summary: The equations for a sphere traveling over the plane are analyzed with the allowance for unsteady links and an unsteady liquid layer in order to investigate more comprehensively the dynamics of the sphere rolling over the surface. It is assumed that mass distribution in the ball is centrosymmetric. The motion of the sphere is represented both as translational together with the center of mass and spherical around the same center. When analyzing the hydrodynamic problem the equation of energy balance is added to the equations of motion and pressure distribution. A case is investigated when the viscosity of the fluid is a function of pressure. The thickness of the lubricating layer is close to the limit. The sphere on the lubricating layer is basically a non-holonomic system. After the obtained equations demonstrate the equations of the fluid, the motion of the sphere can be studied. The model of a fine lubricating layer is to be validated in order to reveal the conditions of pure rolling of the sphere, growing loading compels to take the surface deformation and the nonholonomicity of the model into account.
Torskaya E. V.
The analysis of friction effect on the stress-strain condition of coated bodies. pp. 130--138
Summary: The problem of contact between a spherical indentor and a coated body is analyzed by modeling the latter with a double-layered elastic base. A numerical analytical method is proposed based on integral transformations of Hankel and Fourier. The distributions of stresses within the elastic layer and the elastic base have been determined in respect to hard and relatively soft elastic layers. The effect of the friction coefficient on the magnitude and the sites of concentrations of stresses in the surface layer and in the base has been investigated.
Baranov V. M., Kudryavstev E. M., Sarychev G. A., Stopyra A. Z.
A method of rating variations of roughness parameters and distribution of debris dimensions in the process of running-in of materials of friction units. pp. 139--145
Summary: Relations have been derived to calculate the probability of distribution of projection tips on the friction surface and pressure distribution over microcontact sites as a time function of the running-in process. It is demonstrated that microprojections are smoothed and pressure is leveled of over microcontact sites. These processes evolve fast at the initial stage, while their rate becomes negligibly slow after some time. It is proposed to treat this time as the time of running-in of a friction couple. The distribution of dimensions of the appearing debris is calculate. Comparison of the obtained theoretical results with those published by various researchers indicates that the calculations describe satisfactorily the dispersion distribution of debris of a variety of materials.
Zhukovskii A. N., Maistrenko A. L., Mechnik V. A., Bondarenko N. A.
The stress-strain state of the bonding around the diamond grain exposed to normal and tangent loading components. Part 1. Model. pp. 146--153
Summary: Amathematical model is proposed to determine the stress-strain condition of the bonding around the diamond grain. The model incorporates the diamond grain dimensions, the effects of external stresses and mechanical features (the Poisson coefficients and the elasticity moduli). The components of stresses are determined as a sum of three results of solution of auxiliary problems with specific conditions over the diamond grain contour. Their approximate solution has been obtained with the variational method with the systems of particular solutions of the equations of Lame as coordinate functions.
Kuzyaev I. M.
The analysis of relation between the friction coefficient and pressure with the allowance for the temperature field when materials are handled in the auger passage of screw machines. pp. 154--159
Summary: Problems of selecting optimal relations between friction coefficients in the polymeric material - working passage interface of screw machines and the pressure produced by the auger passage have been studied with the allowance for temperature distribution in the auger passage and its geometrical features.
Kougiya F. A.
The effect of frictional characteristics on the rheological behavior of molten polymers. pp. 160--163
Summary: Some phenomena accompanying extrusion of molten polymers are analyzed when they are due to the unsteady flow of materials induced by high stresses and shear rates. The model has been experimentally validated with the allowance of migration of mobile inclusions from the experimental specimen during its shear deformation.
Pavlov V. G., Fishman R. I.
Experimental estimation of the wear rate of a rolling bearing greased with magnetic powder. pp. 164--169
Summary: A method is proposed how to determine the wear rate of the thrust bearing along raceways due to the spinning and differential slip-page of rolling balls in respect to wire roller paths.
Konchits V. V., Korotkevich S. V., Sautin S. D.
The lubricity of organic deposits on the friction surface at elevated temperatures. pp. 170--175
Summary: The lubricity of organic deposits (the D-layer) precipitating when a lubricating material contacts the hot metallic surface has been studied. Methods of electrophysical probing have served to investigate the mechanical (the load bearing capacity) and friction behavior of D-layers produced on platinum by the oil with an additive of the ZnDTP type. The effect of the temperature in the contact zone on the behavior of the D-layers has been specifically highlighted, their possible role in the mechanism of boundary lubrication is discussed.
Loskutov S. V., Levitin V. V., Gordienko V. N.
Formation of the energy relief of metallic surfaces in the process of friction and wear. pp. 176--180
Summary: The electron work function on metallic surfaces after tests for friction and wear has been studied experimentally. It has been observed that the processes of deformation during friction reduce the electron work function on metallic surfaces. It has been revealed that poor resistance of hard-alloy specimens to wear corresponds to a stronger growth of the work function during tests for friction and vice versa. It is shown that the degree of wear resistance is predictable by measuring the electron work function.
Mashkov Yu. K., Kalistratova L. F., Leontyev A. N., Mamaev O. A., Lipina N. A.
Improving performance of polytetrafluorethylene-based composites. Part 1. The effect of the composition and types of fillers on the structure and behavior of composites. pp. 181--187
Summary: The effect of a variety of modifying fillers on the structure, mechanical and triboengineering behavior of polytetrafluorethylene-based composites in the process of their production has been studied. It is demonstrated that the behavior of the composites depends on the structural and phase condition and he parameters of the supermolecular structure of the polymeric matrix, hence the method factorial experiment design allows to optimize the properties of the composites.
Lenskaya E. V., Rogov V. E., Mognonov D. M.
Modification of friction surfaces of fluoroplastics with aromatic polyheteroarylenes. pp. 188--191
Summary: A fundamentally novel process has been developed to dope fluoroplastic surfaces with modifying components of polyheleroarylenes having various compositions. New composite materials have been developed featuring semi-interpenetrative polymeric fluoroplastic-based lattices. Their mechanophysical and triboengineering behavior has been studied. Doped fluoroplastic friction surfaces significantly improve the wear resistance of friction parts and seals.
Shatsov A. A.
Prospects of application of hard alloys in triboengineering. pp. 192--200
Summary: The combined wear resistance and viscosity of hard alloys of the WC--Co system excel other modem materials. Their broader application can be promoted by implementing more economical processes, pulverizing grains and improving resistance to corrosion. The WC--MexCy system as a Co-based alloy is much appealing basic material to produce composites stronger corrosion resistant composites.
Novitskii V. G., Gavrilyuk V. P., Panasenko D. D., Kalchuk N. A., Horuzhii V. Ya.
The effect of the lubricating material and thermal treatment on the resulting subsurface layers and the wear resistance of 40X steel in sliding friction. pp. 201--206
Summary: The effect of lubricating materials of various compositions and the conditions of heat treatment on the wear resistance of 40X steel, the structure of subsurface layers has been studied in sliding friction. A relation has been established between the triboengineering characteristics of the steel and its original structure and the composition of lubricating materials. It is shown that application of the MoS2--conttaining "Limol" grease renders the steel most wear resistant. The maximum number of microdistortions of the second kind and the least difference between the constants of crystalline lattices occur in the subsurface layer before and after friction.
Tyurin Yu. N., Pogrebnyak A. D.
The effect of duplex treatment on the surface characteristics of articles. pp. 207--214
Summary: Double (duplex) processes most effectively modify surfaces by producing a variety of hardening effects. Special processes of machining, vibration burnishing produce an oil trapping relief on the surface. Such surface relief is effective when articles operate with lubrication. Surface hardening by impulse plasma is effective for dry friction. The article deals with the results of a study, methods of calculation of the optimal surface relief and recommends surface modification with impulse plasma.
Rusin N. M., Kim H. V.
The effect of contact friction on the process of equiduct angular extrusion of materials. Part 2. Extrusion of coated specimens. pp. 215--219
Summary: The effect of contact friction on the shapes of aluminium-alloy specimens has been studied during equiduct angular extrusion. It is demonstrated that the difference between the forces of contact friction between the bottom and top surfaces distorts the shapes of the specimens and produces zones of plastic flow localization.
Yakimtsov V. P., Kapustina I. B.
A study of the behavior of the composite material combining polyethyleneterephthalate and polytetrafluorethylene. pp. 220--222
Summary: The tribological features of the polymeric composite material based on polyethylene terephthalate with various concentrations of finely dispersed polytetrafluorethylene have been studied. It is shown that the tribological and mechanical behavior of the modified polyethylene terephthalate depends on the concentration of polytetrafluorethylene.
