International Scientific Journal
Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus
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FRICTION AND WEAR (Trenie i Iznos) International Scientific Journal Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus |
Summary: A method has been developed to design sliding bearings with the account of forces of inertia of a lubricating fluid (LF) with vis coelastic properties. A precise automodel solution has been found when the lubricating fluid reaches the bearing in the state of full relaxation when viscosity depends on pressure exponentially. Basic working characteristics are determined, the results of numerical analysis of the obtained analytical dependencies for the ultimate loading and the force of friction are presented at different values of the parameter b-1 characterizing the relation between the time of passage and the time of relaxation. The found solutions lead to conclusions that the elasticity of the lubricating fluid affects negatively the working characteristics because forces of friction increase while the ultimate loading reduces compared with these parameters for the Newtonian fluid. The advanced method allows to take into con sideration the elasticity of the lubricating fluid together with its viscosity.
Trubchik I.S., Aizikovich S.M., Krenev L.I.
Mathematically based control of mechanical characteristics of nonhomogeneous coatings by the indentation method. pp. 126--131
Summary: At present nanoindenters are high-precision instruments which allow the performance of non-destructive tests on thin non-homogeneous coatings. But the interpretation of such test results is still under development. In this work the authors suggest the method of mechanical characteristics determination from the test results of the nanoindentation of a thin coating.
Gadzhiev G.H.
Calculation of equilbrium roughness of the inner surface of built-up cylinder of a contact pair. pp. 132--135
Summary: A rough surface model has served to analyze theoretically how to determine the microgeometry of the inner surface of the built-up cylinder of a contact pair to project roughness appearing in operation when the running-in period ends.
Sorokatyi R.V.
Evaluation of efficiency of sliding beraring during reciprocation. pp. 136--143
Summary: The method of triboelements served to solve a contact wear problem of a cylindrical joint.
Zharov I.A., Voronin I.N., Kourtsev S.B.
Approximated calculation of surface temperatures of a "shoe--wheel--rail" system. pp. 144--152
Summary: It is proven that heat dissipation through the spot of contact between the wheel and the rail is as essential as that through air. Formulas are obtained for calculating the average temperature of the shoe and the temperature in the spot of contact between the wheel and the rail. These formulas allow to investigate temperature changes in the process of braking of the rolling stock. It is shown how these temperatures can be controlled.
Borodachev N.M., Tarikov G.P.
Spacial contact problem with the allowance of heat generation in sliding friction. pp. 153--160
Summary: A Hetzian problem is analyzed for a system of two bodies in sliding contact. An integral equation is obtained for pressure in contact area with the allowance of heat generation; its solution has resulted in the law of pressure distribution and has yielded geometrical characteristics of the contact area.
Kougiya F.A.
Consideration of sliding effect on the flow of the melt of a polymer in a channel. pp. 161--165
Summary: A mathematical model of flow an abnormally viscous fluid is considered with the account of sliding of the material over the walls of the channel. The sliding velocity is represented as function of shear stress and elastic shear deformation that appear in the layer of the material adjacent to the walls. The elastic shear deformation is expressed as a function of shear rate.
Ermakov S.F., Parkalov V.P., Shardin V.A.
An integral countable method of rating small changes in the amplitude of oscillations and its application in pendulum tribometry. pp. 166--172
Summary: Changes or variations of the amplitude have been established more informative from the viewpoint of pendulum tribometry than the amplitude of oscillations itself. Principles of valid assessment of the amplitude of oscillations and its changes are proposed. It is shown that gated integration of the signal and assessment of its amplitude values through values proportional to the areas of semiwaves of oscillations followed by determination of their variation within a period ensure high accuracy of numerical averaging of experimental data. A new method has been developed to register fine variations of the amplitude of oscillations and some aspects of its application in pendulum tribometry are considered.
Dzhilavdari I.Z.
Assessment of the modulus of elsaticity using the pendulum technique. pp. 173--178
Summary: A mathematical model is proposed for assessing the modulus of elasticity of the surface of a body based on the effect established earlier that the period of oscillation of the pendulum with a rolling bearing depends abnormally on the amplitude within the range of smaller amplitudes.
Lysenok Yu.V., Balakin V.A.
Experimental study of temperatures in heavily loaded friction units. pp. 179--185
Summary: Experimental methods of temperature measurements in the zone of friction contact of brakes of railway rolling stock, subway, aircraft, rocket track bogies have been analyzed and validated by inertia tests of specimens.
Sviridenok A.I., Ignatovskii M.I., Sveklo I.F., Louis H., Stavrov V.P.
A study of the micro-and nanogeometry of the polymethylmetacrylate surface treated with a water-drop jet. pp. 186--191
Summary: Methods of estimating the micro- and nanoroughness of surfaces of polymethylmethacrylate specimens after treatment with a water-drop jet have been studied using digital processing of images produced with a scanning electron and an atom force microscopes and microprofilograms of sections. It shown that the obtained results can be used to determine the characteristics of the effect of the jet on the mechanisms and parameters of erosion of a material.
Kukareko V.A.
The submicroscopic structure of Ni--Cr dispersion solidifying alloys and their triboengineering properties during adhesive interactions. pp. 192--202
Summary: The structure and triboengineering properties of typical Ni--Cr dispersion solidifying alloys XH67BMTYu and XH56BMTYu with different elastic interphase deformations have been studied. It is established that released particles of the g'-phase with the negative factor of volume incompatibility with the matrix and the increasing hardness of the alloy XH56BMTYu reduce its resistance to adhesive wear. The maximum wear resistance of the alloy during friction without lubrication is achieved when it is homogenous and when small concentrations of g'-particles (< 10 % by volume) are released. As the volume proportion of the g'-phase particles in the XH67BMTYu alloy increases its resistance to adhesive wear drops substantially. It is discovered that during adhesive interactions between specimens of Ni--Cr alloys containing g'-phase particles with the counterbody the particles are cut and dissolve leading to the processes of plastic deformation localization and cracking producing debris. It is concluded that dissolution of the particles of the hardening g'-phase in the process of adhesive interaction of the Ni--Cr alloys is caused by the phenomenon of mechanically activated recovery.
Basinyuk V.L., Belotserkovskii M.A.
Development of technologies and application of multilayer combination oxide ceramic coatings. pp. 203--209
Summary: The potential of application of multiplayer combination oxide ceramic coatings produced with gas sputtering are studied and their best suitable applications have been determined.
Zaitsev A.L., Kirilenko V.P.
Study of debris of some polymers appearing during friction in water using the method of differential thermal analysis. pp. 210--215
Summary: The paper presents the results of differential thermal studies of thermooxidizing destruction of carbochain and heterochain polymers and their debris appearing during friction in water over alloyed chrome-manganese steel. It is shown that the debris of the polymers in question are characterized by thermooxidizing activity that becomes apparent in reduction of the destruction temperature and emergence of exothermal effects due to accumulation of products of reactions of the polymer with water the surface of hydrated metal in the debris. Corrosive resistance of the metal drops strongly during friction in water on polymers that have aromatic functional groups in their structure. Polymers that have simple ester groups in the structure of macromolecules possess the least corrosive activity in respect to steel.
Weis H., Pichugin V.F., Levin A.S., Zauer H.
Study of wear resistance of multilayer composite systems based on high-strength reinforced polymers. pp. 216--222
Summary: A method is proposed how to improve wear resistance of high-strength reinforced polymeric shafts serving to process and feed coiled commodities by galvanizing them with protective multilayer metallic coatings. A process is developed to apply metallic coatings to highly adhesive polymers and factors are demonstrated affecting the performance of the coatings. A selection of equipment is made to study the protective multilayer coatings; how they influence the wear resistance and adhere to the polymeric base by performing rolling friction and cavitation wear tests. A method of experimentation is developed to optimize adhesion and performance of coatings.
CONGRATULATIONS. p. 229
CONFERENCE CALENDAR. p. 230
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