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Published by INFOTRIBO Ltd., Gomel, Belarus
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ÒÐÅÍÈÅ È ÈÇÍÎÑ Ìåæäóíàðîäíûé íàó÷íûé æóðíàë Published by INFOTRIBO Ltd., Gomel, Belarus |
Kovalenko E. V., Yevtushenko A. A., Ivanik E. G.
On the calculation of temperature at breaking. pp. 435--441
Summary: A model is proposed which enables the surface friction temperature in braking to be found. The change of the heat flow generated due to friction with time and with respect to coordinate is taken into account. It has been found that high surface temperatures are reached during long braking.
Korochkina T. V., Meshkov V. V.
Estimation of the stress state of precision movable coupling of pump under dynamic loading. pp. 442--447
Summary: Estimation of the stress state has been fulfilled for the rubbing parts of precision coupling in axial-piston pump under high loading and velocity, including dynamic. The stress state has been determined using the finite element method. The relations have been obtained for the stresses occurring in the friction parts at impact loading as dependent on time, friction force and sliding velocity. The most dangerous domains of high stresses were defined. Based on the results of the analysis recommendations have been elaborated to improve the structure and to choose the material of tribojoint aimed at enhancement of its performances.
Shilko S. V., Stolyarov A. I.
Friction of anomalously elastic bodies. Negative Poisson's ratio. Part 2. Calculation of self-locking effect. pp. 448--455
Summary: The frictional joint made of material with negative Poisson's ratio and self-locking effect are studied by means of finite element modelling. The numerical results have shown that pressure concentration under tangential loading provides the friction force increasing.
Voitov V. A., Isakov D. I.
Modelling boundary friction in tribosystems. II. Mathematic modelling technique for stationary processes at boundary friction. pp. 456--462
Summary: The methodology of mathematical modelling complex for standing friction processes under the conditions of boundary lubrication appling the theory of similarity and modelling, the criterional gliding of experiments is presented. The methodology permits to define the tribological characteristics of friction systems and optimise them.
Balakin V. A., Sergienko V. P., Komkov O. Yu.
Dynamic processes emerging at start of clutches and brakes. pp. 463--469
Summary: A two-body dynamic model of a vehicle have been considered. Torsion oscillations caused by start of frictional clutches and brakes have been calculated.
Dzhanakhmedov A. Kh.
Heat failure of friction pairs (brakes) operating in the repeated-short regime. pp. 470--474
Summary: The analysis of strained state of surface layer in braking showed that the force of friction in braking facilitates strengthening of surface layer and the creation of compressed residual stresses. The temperature deformations as a rule results in the strengthening effect connected with the formation of extended residual stresses. Thermofluctuating processes of braking run more intensively and they are resulted in fatigue of solid bodies. Concept of strength confirms that heat plays essential role in fatigue of solid bodies. This becomes useful in making various schemes of calculations of microstresses. The possible ways of controlling the mechanical fatigue in frictional devices are given.
Evdokimova A. N.
Determination of surface temperature at high-speed friction with account for the direction of shear strains. pp. 475--479
Summary: The temperature distribution in the contact zone and near its borders at high speed friction depending on the direction of friction disk rotation and on the direction of handled surface movement is for the first time discussed. It is shown that temperature maximum in the contact zone changes its position in the direction of friction disc rotation while the temperature at the exit of friction contact is always higher than at its entrance independently of the direction of friction disc rotation. The process of two side tension deformations leads to higher temperatures in contact zone and near its borders in comparison with one side tension deformation of surface layers. It causes the intensification of strengthening process and white layer formation and found its practicable use as a technological method of friction strengthening.
Kuzmin N. N., Shuvalova E. A., Trankovskaya G. R., Muravjeva T. I.
Methods of analysis of surfaces structures formed in friction. pp. 480--486
Summary: Characteristic morphological signs of surfaces formed in various regimes of friction are presented. Analysis methods and surface structures classification are proposed. Possible ways of structures formation based on boundary layer media friction flow are described. The paper gives recommendations on estimation of friction junction effectiveness based on the analysis of surface structures formed in friction interaction.
Pinchuk V. G.
The structural features of microplastic deformation of metal surface layers at friction on a stage of surfaces. pp. 487--490
Summary: Some dislocation gears of destruction of a surface layer of a metal by friction are investigated. An effective role of borders with large angular disorientation and acting zones of sliding in formation of cracks is determined.
Khmyl A. A. , Dostanko A. P., Anisimovich V. G., Chizhik S. A.
Effect of polishing on steel surface roughness and contact performance. pp. 491--496
Summary: Comparative analysis of surface roughness of steel polished by various techniques is presented. The most smooth surfaces are produced by mechanical and plasmaelectrolytic treatment. The latter method provides better operation performance.
Antsiferov V. N., Smyshlyaeva T. V., Shatsov A. A.
Self-lubricated pseudo-alloy on the basis of copper for products antifriction and constructional purpose. pp. 497--502
Summary: The new approaches to creation of tribotechnical materials on the basis of copper are discussed. Physical-mechanical and antifriction properties of pseudo-alloy Cu -- CuO (1%) -- CaF2 (1%) at friction without greasing in porosity interval from 12 to 27% are discussed. Conditions of minimization of size changes at the stage of sintering are determined. Connection between porous structure and kind of contacting surfaces in wide intervals of planimetric pressure is established. It is shown, that irrespective of a kind of contacting surfaces and porosity the least intensity of wear process corresponds to same density of dislocation.
Kovtun V. A., Pleskachevskii Yu. M, Shuvalov V. B.
Cermet frictional coatings formed by electro-contact sintering from powder composites. pp. 503--507
Summary: A metal--ceramic material and a technique to produce 1--3 mm thick frictional coatings used in heavy--duty friction units or industrial equipment without lubrication have been developed. The analysis is given of investigation results of the coating microstructure and triboengineering characteristics. Clutch discs for electromagnetic couplings of the technological equipment have been manufactured and tested at "Gomeloboi".
Konstantinov V. M., Panteleenko F. I., Ivanov V. P.
Abrasive wear resistance of coatings based on diffusively-alloyed powders. pp. 508--512
Summary: Abrasive wear-resistance of coating formed from diffusely-alloed self fluxing (DASF) powder based on iron is investigated depending on the chemical composition and process of application. It was found out that coatings from DASF powder besed 10P6M5 possess the highest abrasive wear-resistance.
Konchits V. V., Kirpichenko Yu. E., Korotkevich S. V.
Temperature investigations of boundary layers by electrical contact resistance method. pp. 513--526
Summary: Possibility of using the contact electrical conductivity parameters to analyze the boundary lubrication regime depending on temperature are considered. Behavior of the contact conductivity in temperature range, which is typical for lubricated tribo-systems, is analyzed. The microtribometer for temperature investigations is described. The experimental data on the temperature influence on interface state of lubricated point contact of steel surfaces are presented. The electrophysical methods use at boundary lubrication is examined.
Matsevity V. M., Lyubchenko A. P., Kazak I. B.
The efficiency of vacuum-plasma coatings for triboengineering purposes. pp. 527--530
Summary: Triboengineering properties of bilayered vacuum-plasma coatings in a wide range of normal loads have been investigated. It is shown that they are promising for details in heavy-loaded friction pairs.
Nazarenko P. V., Polishchuk I. E., Ostranitsa A. E.
The features of the structural changes of the gas-thermal coatings under the friction. pp. 531--537
Summary: The features of the structural changes of the gas-thermal coatings under the friction are investigated. The main factor of the serviceability of the gas-thermal coatings is load. This factor depends on the strength characteristics of the coatings. The heterogeneous secondary structures on the surf ace of the coatings are formed under the friction. These structures supply the high level of the triboengineering properties.
Popok N. N.
Comparative efficiency of cutting tools with antiwear coatings. pp. 538--543
Summary: Evaluation of efficiency of cutting tools with wear-resistant coatings is described. Comparative research is carried out in wear resistance of cutting tools made of various materials when machining the parts made of stainless steels, titanium, aluminum and soft magnetic alloys. Recommendations on application of cutting tools with multilayered wear-resistant coatings have been worked out based on the results of the research.
Vinogradova O. V., Bazhenova V. B., Gribova I. A., Krasnov A. P., Gulyaeva T. A., Nedel'kin V. I.
The tribochemical processes in polyphenylenesulfide filled by molybdenum disulfide and graphite. pp. 544--549
Summary: The article describes use of polyphenylensulfide as binder of antifrictional selflubricating plastics filled by molibdenum disulfide and graphite. Triboengineering properties of plastics have been evaluated in wide range of temperatures. It is shown that these properties depend on structure of polyphenylenesulfide.
Okhlopkova A. A., Sidorenko T. N., Vinogradov A. V.
Triboengineering and mechanical characteristics of the modified polytetrafluorethylene. pp. 550--553
Summary: Investigated are mechanical and tribological properties of composite materials based on the PTFE filled by ultradispersed inorganic b-syalon and thermoplastic. The relation between degree of wear, other properties of composites and formation of various supermolecular organization of matrix is shown. The addition of thermoplastic to PTFE as a matrix modificator promotes formation of the secondary supermolecular structure which causes increased wear resistance.
Zayats I. M.
Tribological and mechanical performance of modified wood-polymer composites. pp. 554--558
Summary: Mechanical properties and tribological performance of wooden-polymer composites based on phenolphormaldehyde binder are evaluated. These composites are shown to be efficient in heavy-loaded friction units.
Shcherba V. Ya., Kirilenko V. P., Prushak V. Ya., Zaitsev A. L.
Friction characteristics of polymers and composite materials in three body abrasion with water lubricant. pp. 559--563
Summary: Thermoplastic and thermoreactive polymer friction properties in the process of three body abrasion with silicon carbide were studied. Wear of metal and friction coefficient are described by extreme dependencies from microhardness. The reason of this phenomena due to different abrasive particles and metaloxides wear products impact into the friction surfaces.
ÊÀËÅÍÄÀÐÜ ÊÎÍÔÅÐÅÍÖÈÉ. pp. 566--567.