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: The problem of rolling with slippage of an elastic cylinder on an elastic semispace is analyzed. The relation between stresses on the surface and inside the contacting bodies and the magnitude of relative slippage and the friction coefficient is studied. The effect of fine surface films on the distribution of stresses is investigated. Tensile and maximum tangent stresses are analyzed specifically because they may cause crack nucleation, produce the areas of plastic yielding and induce failure of surface layers of materials.
Voronin N.A.
A theoretical model of elastoplastic penetration of the rigid sphere (Methodological basics of assessment of mechanical characteristics of compact homogenous materials by the method of kinetic indentation with a spherical indentor). pp. 16--26
Summary: The paper deals with the penetration of a rigid sphere into a homogenous elastoplastic hardenable solid body. The model has served to advance analytical dependencies describing the behavior of the hardenable elastoplastic solid body in the elastoplastic region of contact deformation in the terms of the loading, mean contact pressure -- the imprint radius and the loading, the mean contact pressure -- the depth of indentation. The results of calculation of some plastic characteristics of a number of metallic materials are presented. It is shown that the calculation results coincide will with the experimental studies. The proposed analytical dependencies can be useful to process an experimental diagram of indentation in order to calculate the mechanical characteristics of a studied material.
Argatov I.I.
The theory of elastic nonsaturated contact between rough surfaces. pp. 27--34
Summary: The theory of Kraguelskii--Demkin is summarized for the elastic nonsaturated contact between a rough and a smooth surfaces. Projections on the rough surface are modeled with a paraboloid of revolution. Functional equations have been derived combining the function of distribution of the projections according to their heights with the reference curve of the profile for a given function of the shape of a projection. The spherical model of Zhuravlev has served to tackle the problem of elastic contact between two identical rough surfaces.
Sorokatyi R.V.
Solution of the problem of wear of a fine elastic layer with a rigid bearing mounted on a rigid shaft using the method of tribolements. pp. 35--41
Summary: The method of triboelements has served to solve the problem of wear of a radial sliding bearing with an antifriction element mounted on a shaft.
Dzhilavdari I.Z.
Investigation of the elasticity and elastic hysteresis of surfaces based on the dynamics of the physical pendulum motion with a rolling-contact bearing. pp. 42--48
Summary: The results are presented of the studies of surface friction and elasticity by measuring the amplitude and the period of motion of the physical pendulum. Friction coefficients, resistance to rolling and hysteretic losses have been calculated for a number of materials ranging from sapphire and solid alloys to glass and brass. A relationship has been established between the motion period and the elasticity of the bearing.
Luis H., Stavrov V.V., Stavrov V.P.
Characteristics of the water-drop jet used to remove brittle coatings. Part 2. Model. pp. 49--53
Summary: A statistical model is proposed how a water-drop jet affects brittle coatings with the allowance for periodic and stochastic pressure pulsations in the atomizing nozzle, the scatter of diameters of drops, the relationship between the velocity of a drop, its diameter and the resistance of the atmosphere. The scope of damage induced by a single drop is given in the form of a linear function of the diameter of the drop versus its velocity. Characteristics are determined how the dimensions of the damaged area distribute when the coating is exposed to a "flat" or a "round" jets. The adequacy of the model has been validated by experimental studies of the traces of the water-drop jet on the magnetic layer of the polyethylenterephthalate videotape.
Vityaz P.A., Zhornik V.I., Azizov R.O., Prokopovich N.N.
Triboengineering properties of borated coatings from low-carbon steel CB-08. pp. 54--56
Summary: Triboengineering properties of sprayed coatings from the low-carbon steel modified by thermodiffusion treatment in boron-containing media have been studied. It is shown that during friction without lubrication the borated layer resists wear 2.1--2.2 stronger than the tempered steel.
Basinyuk V.L., Mardosevich E.I., Smilovenko O.O.
Friction planetary gears with improved transmission efficiency. pp. 57--63
Summary: The effect of design parameters and the friction coefficient of rubbing members of planetary gears having high gear ratios on their efficiency has been studied. It has been established that the friction behavior of a sliding joint like "eccentric--satellite" has decisive influence on their efficiency. Technical solutions are advanced to use modified oxide-ceramics to bring the efficiency up to 0.9--0.97.
Shakh R.S., Bhat M.V.
Combined effect of anisotropic permeability and slip velocity on porous-walled squeeze films lubricated with a ferrofluid. pp. 64--70
Summary: We analysed here the combined effect of anisotropic permeability and slip velocity on porous-walled squeeze films between circular plates. The lubricant chosen was a ferrofluid flowing as per Jenkins flow behaviour. While the lower plate was flat, we considered the upper plate to have any of the three shapes, exponential, flat or secant. We also considered the two cases when the porous matrix was attached cither to the upper or lower plate. We obtained expressions for dimensionless pressure and load capacity, while the response time was given by a differential equation. The load capacity and response time were computed and their values were displayed in tabular form. Both decreased with increasing values of radial permeability parameter while both increased with increasing values of the axial permeability parameter. The load capacity and response time were more for the exponential upper plate than those for the flat upper plate while the slip velocity decreased the load capacity and response time of the porous squeeze film, anisotropic permeability enhanced them.
Panin S.V., Panin V.E., Durakov V.G., Belyaev S.A.
The effect of structure and thickness of the surfaced layer on the pattern of wear and development of plastic deformation of the specimens of structural steel with a hardening composite coating. pp. 71--79
Summary: Processes of plastic deformation have been studied at meso- and macroscale levels during friction of structural steel with composite hardening layers. It is shown that the pattern of plastic deformation at the mesoscale level in the compositions with coatings is characterized by a number of significant features realing to the appearance of the hierarchy of stress concentrators at two interfaces, vis. "counterbody -- coating" and "coating -- base". Examination of images with an optic TV measuring TOMSC complex has enabled to establish that transverse shear components resulting from the relaxation of stress mesoconcentrators at the "counterbody -- coating" interface produce periodic alternation of tension and compression zones. It dictates transverse redistribution of solid particles in the fine surface layer and appearance of a "lineage structure" in it.
Sorokin G.M., Safonov B.P., Begova A.V.
The criteria of selecting steels for applications encumbered with abrasive wear. pp. 80--84
Summary: Scientific and methodological approaches are formulated to the structure of the criteria of wear resistance of steels, alternative criteria of assessing abrasive wear are analyzed using standard mechanical characteristics of steels. It is shown that the mechanical characteristics of the group of strength and plasticity should be considered in their integrity.
Bulatov V.P. †, Sedakova E.B., Kozyrev Yu.P., Gubanova G.N., Meleshko T.K., Kudryavtsev V.V.
Application of the method of acoustic emission to assessing wear of polymeric composites based on polyimide and polytetrafluorethylene. pp. 85--91
Summary: Wear resistance of filled polymeric materials based on polyimide and polytetrafluorethylene (fluoroplastic-4) have been studied by simultaneous registration of the parameters of acoustic emission (AE). Fillers have manifested positive effect on the level of acoustic emisson energy and its distribution. It is concluded on the basius of the known model of adhesive wear that the strength of structural bonds is comparable with the magnitude of the mean energy of acoustic emission signals. The obtained empirical relationship enables to rate the wear resistance of the studied composities in relation to their polymeric matrices.
Kukareko V.A., Baranovskii K.E., Kalinichenko A.S.
The mechanism of formation of a copper film during friction of bronze on steel without lubrication. pp. 92--97
Summary: Phase transformations and triboengineering properties of the silicon-manganous bronze have been studied during its friction on the tempered steel without lubrication. It has been revealed that a copper film appears on the contacting surface of the tribocouple reducing the friction coefficient and wear rate. A mechanism is proposed how the copper film appears taking into account local melting of the matrix phase g-Cu5Si near larger particles of the silicide Mn5Si3 followed by the crystallization of the films from the melt in the form of a copper film with the face-centered cubic lattice doped with silicon and manganese.
Pashkevich M.F., Pashkevich V.M., Pashkevich A.M., Lopukhovskii K.A.
Study of wear of engagement parts of cam-plunger gears. pp. 98--103
Summary: The results of studies of wear of engagement parts of the radial plunger gear are presented. Relationship has been established between the wear of ball plungers and that of other engagement parts. It is shown that the wear of the engagement parts of the gear strongly affects its kinematical precision and efficiency. When the wear of the engagement parts augments the efficiency of the gear somewhat reduces, the kinematical precision worsens. Moderate frequency and high frequency harmonic components of a significant magnitude appear in the spectrum of kinematical errors.
Zozulya V.D.
Bearing materials produced by self-spreading high-temperature synthesis. pp. 104--108
Summary: Publications are reviewed relating to production of powdered metal-ceramic materials by self-spreading high-temperature synthesis and their use for fabrication of sliding bearings. Principles are described how to produce bearing materials by the methods of self-spreading high-temperature synthesis (SHTS-methods) that wear away during friction when a solid greasing component included into the composition of the bearing material serves for lubrication. Basic triboengineering characteristics of materials, methods of their determination and the design of the friction apparatus are described.
Zlotnikov I.I., Selitskii S.F., Piskunov S.V.
Feasibility of using water soluble silicate-polymer systems as the base of coolant lubricants. pp. 109--112
Summary: It has been studied whether it is feasible and promising to use a silicate-polymer system, like liquid glass -- polyvinyl alcohol, as the base of a water-soluble coolant lubricant for grinding metals. The results of studies of selection of components of a new coolant lubricant arc presented together with the determination of the triboengineering and chemophysical properties of the components.
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