Trenie i Iznos (Friction and Wear), 2001, Vol.22, No.2
/ Publications / Scientific Journals
Trenie i Iznos (Friction and Wear), 2001, Vol.22, No.2
Volume 22, Number 2; March--April, 2001
CONTENTS
ARTICLES
Balakin V.A., Sergienko V.P., Rodzevich P.E., Lysenok Yu.V.
Comparative analysis of thermal load on truck brakes. pp. 123--127
Summary: Temperature increments on friction surface of brakes of trucks of various models have been calculated for the cases of emergency braking along road horizontal stretches.
Shil'ko S.V., Petrokovets E.M., Semenova T.V.
Estimation of local coatings complience: comparison of calculation methods. pp. 128--133
Summary: The estimation of elastic coatings surface displacements under uniform distributed pressures is given for comparison of analytical and numerical (boundary elements and finite elements) solution.
Komarovskii I.A., Zharov I.A.
The effect of hardenss on the wear resistance of wheel and rail steel simulated with rollers under various loading coditions. pp. 134--139
Summary: The loading conditions of rollers from wheel and rail steel have been identified when the wear rate of the rollers is a function of their hardness simulating the actual conditions in operation.
Kulchitskii-Zhigailo R.D.
Axially symmetric contact problem for rotating nonhomogenous bodies with the account of heat generation. pp. 140--149
Summary: Effective methods are advanced to investigate the axially symmetric problem for rotating non-homogenous bodies with the account of heat generation. The Poisson coefficient is assumed constant, meanwhile the Young modulus the coefficients of linear thermal expansion and heat conductivity are exponential functions of the distance to the surface of the body. A parametric analysis of the expressions for temperature and vertical displacement of the points on the surface of the body has been accomplished. The effect of nonhomogeneity of the material on the radius of the contact area has been studied.
Fedorov V.D.
Internal friction in the polycarbonate during tests using the method of torsional vibrations. pp. 150--155
Summary: The method of torsional vibrations has served to study the dissipative losses in the polycarbonate. The relaxation and quantum mechanical models of structural transitions have been used to analyze experimental data. The relaxation model of transitions fails to yield a quantitative correlation between the calculations and experimental coefficients of mechanical losses. The quantum mechanical model relates the dissipative behavior of amorphous polymers within the range of a and b transitions lo the boundary values of the electron energy of the segments which are sufficient for their microphase transition. Quantitative determination of the dissipative energy. The modulus of losses and the coefficient tan dm during a and b transitions confirm the adequacy of the quantum mechanical model for which the calculated and experimental values of tan dm show correlation.
Chernous D.A., Petrokovets E.M.
Solution of the Bussinesk problem for theorthotropic semispace. pp. 156--159
Summary: A method of solution of the Bussinesk problem for the orthotropic semispace has been elaborated using the integral Fourier transformation. The shift of the free surface of the semispace have been determined for specified elastic characteristics of composite orthotropic materials used in friction units.
Bogdanovich P.N., Tkachuk D.V.
Temperature distribution in depth of thin subsurface layers of rubbing bodies at high-speed friction. pp. 160--167
Summary: Temperature distribution in depth of thin subsurface layers of rubbing bodies has been studied for glass - metal, sapphire - glass, and glass -- glass pairs at high-speed sliding. The temperature field is shown to be governed by the relative contribution of the processes running in the contact zone. Frictional heat sources of two types can exist for different mating materials and P,V-conditions.
Pogodaev L.I., Chulkin S.G., Dudko P.P., Kuzmin V.N.
Structure and energy approach to the assessment of the effect of lubricating compositions on the wear resistance of tribocouple. Part 1. The structure and energy model of wear. pp. 168--172
Summary: A simplified structure and energy model has been developed reflecting the effect of wear of tribocouples (at the mesostructural level) on the conditions of loading and energy intensity of rubbing surfaces.
Kuzharov A.S., Bulgarevich S.B., Kuzharov A.A., Kravchik K.
Molecular mechanisms of self-organization during friction, part ii.orientational order of the bearing layer during self-organization under hydrodynamic friction conditions. pp. 173--179
Summary: A physical substantiation has been found how the structurization of the lubricating material resulting from the orientational order of anisodiametric particles in its composition (molecules and colloid particles) in the gradient high-speed flow which leads to the self-organization of the bearing layer and creates the minimal force of friction during hydrodynamic lubrication when the loading or the sliding velocity augment continuously.
Nikolaev V.K., Domoratsky V.A.
Bronze-Teflon bearing of glide for exploitation in conditions of a see environment. pp. 180--185
Summary: Regimes of building-up of chromic covers on spherical particles of the porous bronze framework anti-frictional details have been investigated. Data about a durability of porous bronze details skin-deep modificated by chromic were obtained. The picture of building-up of a chromic layer on a surface and interparticle collars of bronze particle was detected. The application of metalorganic compounds of chromic was recommended for bearings, which work in conditions of the see medium.
Kostygov V.T.
Dislocation processes in the mechanism of failure of lubricated friction surfaces. pp. 186--189
Summary: The results of triboengineering and X-ray graphic studies of fine layers on steel specimens are described. It has been studied how deep substructural changes penetrate and their parameters as well as the effect of dislocation processes on the wear rate of friction surfaces. The chemophysical effect of lubricating oils on the evolution of dislocation processes in the surface layer has been validated.
Abdrashitov E.F., Tarasenko V.A., Tikhomirov L.A., Ponomarev A.N.
Friction and wear of plasmochemically modified elastomers. pp. 190--196
Summary: Methods of plasmochemical modification of rubber articles are described. Comparative triboengineering and mechanophysical tests of a number of rubbers modified using various methods have been performed. It has been established that modification strongly reduces the friction coefficient and promotes the wear resistance of the rubbers. It is demonstrated that plasmochemical modification of rubbers does not affect their volumetric mechanophysical properties.
Zavalishchin A.N.
The mechanism of appearance of coatings during friction contact. pp. 197--202
Summary: A mechanism is proposed how coatings appear in the zone of friction contact between the surface of the underlying part and the rotating metallic brush. Analysis of modifications of the surface structure of the base and the coating has shown a sequence of all the processes evolving in the contact zone as a function of the intensity of interactions between the brush pile and the surface. According to the mechanism under study the donor - the brush - the base system has the surface of the base which is assumed to be a self-organizing system with a definite hierarchy of structures. They appear on the surface of the base depending on the extent of hardening due to intensive plastic deformation, mechanochemical doping by the second component and appearance of oxygenated alloys. The thickness of the coating is governed by the self-sustained oscillatory process on the surface during intensive interactions.
Zaitsev A.L., Kirilenko V.P.
Abrasive effect of silicon carbide during sliding friction of metals in lqiuid media. pp. 203--210
Summary: Friction pairs of cast iron and bronze have been tested in liquid media (water, ethanol, hexanol, hexane) containing free abrasives. The characteristics of friction, dispersion and hardening of the abrasive surface layer are strongly governed by the chemical structure of the liquid used in the tests. Metals show the maximum wear. Dispersion and hardening of SiC during friction in the distilled water. When the molecular mass of alcohol increases (the concentration of OH-groups reduces) the abrasive effect of SiC diminishes and friction characteristics improve. The obtained data are explained by the fact that flushing SiC with water reduces resistance to oxidation due to the disassociation of water molecules on the surface and their replacement with silanol structures which intensify oxygen diffusion into the surface layer. Hydrated and oxide structures are a possible cause of stronger dispersion and abrasive effect of SiC when metals rub in the media with high concentrations of OH-groups.
Kravchenko V.I., Manulenko A.F., Drobyshevskii V.N., Struk V.A.
The structure and the features of composite materials based on the polyamide-polyethylene terephthalate blends. pp. 211--215
Summary: Mechanophysical and triboengineering behavior of composite materials have been studied which are produced by thermomechanical combination of polyamide 6 with polyethylene terephthalate. It is shown that combined matrices are effective binders for machine building materials for various functional applications.
Ivashchenko S.A.
Investigation of wear resistance of coatings from self-fluxing alloys during rolling friction. pp. 216--221
Summary: The results of studies of the wear resistance of coatings from self-fluxing alloys are presented when the coatings are exposed to the concentrated sing-variable loading. A relationship has been established between the extent of wear of the rolling guides and the tightness, between the diameters of rolling bodies and the percent concentration of alloying elements in the coating material.
Nevzorova A.B., Vrublevskii V.B.
Determination of efficiency of sliding bearing from wood deformed by end face pressing. pp. 222--226
Summary: A thermal calculation of the friction unit with a sliding bearing from compressed wood has been performed. The boundary conditions polytetrafluorethylene efficiency of self-lubricating sliding bearings from wood deformed by end-face pressing have been determined based on the ultimate quantity of heat dissipated from the friction zone. The results are presented in the form of a table for easier determination of the load bearing capacity of the sliding bearing under the specified conditions and making decision about replacement with a rolling bearing or possible redesigning of the friction unit.
HISTORY OF TRIBOLOGY
Buyanovskii I.A., Fuks I.G.
Physical and chemical aspects of lubricity (Dedicated to the 90-years jubilee of Professor G.I. Fuks). pp. 227--233
Summary: The article dedicated to the 90-year jubilee of Professor G.I. Fuks, a famous specialists in colloid chemistry and the founder of a domain, vis. the colloid chemistry of oil and petroleum products summarizes the results of his studies of the process of boundary lubrication and the features of interaction between lubricating materials and rubbing bodies. Ideas about boundary lubrication and origin of boundary lubricating layers are discussed. Specific tribute is paid to the studies by G.I. Fuks of the friction of bodies lubricated with a polymolecular boundary layer and assessment of reduction of surface strength of solids in the surfactant environment using the method of microindentation.
MEN OF SCIENCE
Nikolai Borisovich Demkin (75 years since birthday). pp. 234--235
CHRONICLE
News of International Tribology Committee. pp. 236--236
OBITUARY
Matveevsky Rostislav Mitrofanovich. pp. 237--238
Kudinov Vladimir Alexandrovich. pp. 238--239
CONFERENCE CALENDAR. p. 240
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Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: September 25, 2001
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2001 The National Academy of Sciences of Belarus
Copyright © 2001 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
