Trenie i Iznos (Friction and Wear), 1999, Vol.20, No.4
/ Publications / Scientific Journals
Trenie i Iznos (Friction and Wear), 1999, Vol.20, No.4
Volume 20, Number 4; July--August, 1999
CONTENTS
ARTICLES
Drozdov Yu.N.
Tribological failures of space equipment. pp. 355--357
Summary: Examples are demonstrated of emergencies on the board of space missions due to tribological failures.
Jakunin N.N., Kalimullin R.F.
Theoretical investigation of the conditions of fitness of sliding bearings. pp. 358--363
Summary: The results of a theoretical study of the condition of fitness of sliding bearings containing a lubricating material in operation are demonstrated. The study is based on general models of interactions between rubbing surfaces with the consideration of three-dimensional, mechanophysical and geometrical parameters of rubbing surfaces and components.
Shamshur A.S., Ilyuschenko A.Ph.
The energetics of seizure of metals in sliding friction. pp. 364--370
Summary: The mechanism is considered how the absorbed energy of the subsurface layers of rubbing metallic bodies is transformed through the electric energy into heat. It is manifested that once the absorbed energy reaches critical values it turns into heat in the region of concentration of thermal currents. Instant high temperature flashes in the contact zone make the particles of a solid body more mobile making the surface energy transformation repeated causing seizure of rubbing bodies.
Mamedov V.T.
Effect of the geometry of packers of oil extracting equipment upon the self-sealing. pp. 371--377
Summary: Results of studies are demonstrated which allow to interpret differently the effect of self-sealing by the oil well packers with elastic intricately shaped components with passage holes arranged concentrically and eccentrically. Theoretical and experimental validation of the geometrical shapes and dimensional parameters have been validated when they differ from those disclosed in the classic theory of seals. An engineering method has been developed how to determine the coefficients of dimensionless parameters characterizing geometrical shapes, dimensions and loading conditions of elastic components of packers.
Byeli A.V., Kukareko V.A., Boyarenko I.V.
Triboengineering characteristics of marten-site corrosion resistant steels after nitrogen ion implantation with a high density current. pp. 378--387
Summary: Chrome containing steel of the martensite grade 20X13, 40X13 and 95X18 have been studied by low energy high current nitrogen ion implantation to D = 2.5•1019 cm-2 within the temperature range 610-720 K. the phase composition and the microstructure of the surface layer was examined using the X-ray structural and metallographic methods. The triboengineering features of the materials in sliding friction without lubrication were investigated. It has been established that the modified layer in the steels penetrates 15-20 µm deep and the microhardness reaches 13000 MPa. Implantation induces emission of iron e-, g-, a-phases and CrN. The wear resistance of the steels would reach the maximum after treatment at a temperature 670-720 K, steels 20X13 and 95X18 would become 5-6 times stronger, steel 40X13 -- 3 times stronger. A physically validated model is advanced to explain how strong - current nitrogen ion implantation improves the triboengineering behavior of the steels.
Chaus A.S.
Features of wear of cast and rolled high-speed steel tools in turning. pp. 388--392
Summary: The results of durability tests of cutting plates from cast and rolled high-speed steel P615 demonstrate a relationship between the structural features, the pattern of wear and the durability of tools. Electron microscopic studies have revealed that high wear resistance of cast tools compared with rolled high-speed steel tools is due to the protective effect of the web of eutectic carbides which reduce local plastic deformation of tools inhibiting abrasion, adhesion and deep destruction of rubbing surfaces.
Pribytkov G.A., Durakov V.G., Polev I.V., Wagner M.I.
Structure -- abrasion wear resistivity relationship of titanium carbide -- metal matrix cermets, produced by sintering and by electron-beam facing. pp. 393--399
Summary: A relation between abrasion wear resistivity and structure features (carbide particles size and volume fraction, thickness of metal matrix interlayers) of TiC--Fe alloy cermets have been investigated. The results have been discussed in association with those obtained with other materials. High abrasive resistivity of the cermets is because of high hardness of TiC and is influenced highly by metal matrix abrasive resistivity.
Kireenko O.F., Ginzburg B.M., Bulatov V.P., Budtov V.P.
Effect of fullerene C60 upon the processes of friction of steel sliding on copper. pp. 400--405
Summary: Comparative tests of friction of the steel roller on copper foil with loading increased in steps have been performed with the lubricating material containing various carbon additives, including fullerene C60 introduced by different techniques. It is demonstrated that only the powder-like C60 additive to the oil would promote transition to the wearless friction mode improving life, increasing load margin until scoring, stabilizing the moment of friction and reducing the friction coefficient several times to the level of 0.01--0.03.
Sokolova M.D., Adrianova O.A., Cherskii I.N., Popov S.N.
Mechanophysical and triboengineering behavior of modified rubbers in movable seals. pp. 406--411
Summary: The study relates to the effect of super high molecular polyethylene upon the behavior of butadiene-nitrile rubbers used to fabricate movable sealing members of machines and mechanisms. Mechanophysical and triboengineering tests have manifested better wear) fatigue, oil and frost resistance, smaller friction coefficient and adhesion. The phase structures of the composition were studied using X-ray diffraction measurements, electron microscopy, dynamic tests. It is demonstrated that the rubbers filled with SHMPE are coated with a surface protective polymeric film and acquire a biphase system.
Pavelko G.F.
Tribochemical reactions of thiols, organic sulfides and disulfides with iron. pp. 412--420
Summary: Tribochemical reactions of individual thiols, organic sulfides and disulfides with iron have been investigated in the atmosphere of argon and air with boundary friction of the steel surface in the wear resistant region and during mechanical activation of the reduced iron powder in a vibromill. It is demonstrated that thiols in these conditions produce iron dithiolates and iron sulfide, while organic sulfides produce exceptionally iron sulfide.
Krasnov A.P., Vygodskii Ya.S., Fedorova L.S., Sakharova A.A., Afonicheva O.V., Volkov I.O.
Behavior of multicomponental system based on the copolymers of acrylonitril withbutylacrylate and polyamide infriction. pp. 421--425
Summary: The effect of the composition of the polymeric system including a copolymer of acrylonitril with butylacrylate and polyamide upon the behavior of specimens in friction has been investigated. It is demonstrated that friction induces thermal and chemical transformations of the acrylonitril component stimulated by the low temperature decomposition of butylacrylate. The resulting structure produces stable low friction of the coating up to 400°C.
Savkin V.G., Chmykhova T.G., Senatrev A.N., Delikatnaja I.O., Biran V.V.
Investigation of triboengineering characteristics of lubricants modified with sulfured tar. pp. 426--432
Summary: A possibility is demonstrated that sulfured tar of vegetable oils and industrial fats can be an effective anticorrosive and antiscoring additive in lubricants. Some aspects of the mechanism of action of sulfur containing compounds in the processes of modification of separating layers on the friction surface creating their high triboengineering characteristics are analyzed.
Latyshev V.N., Naumov A.G., Chirkin S.A.
Mechanisms releasing coolant lubricants from microcapsules during friction between metallic surfaces. pp. 433--438
Summary: A new method of lubricating rubbing materials during cutting is presented by delivering lubricants in microcapsules. The regions are determined within which the microcapsules remain unruptured. The dominating mechanisms are demonstrated which release the internal phase of the microcapsules under external effects. Experimental results have been obtained validating the effectiveness of the proposed method in comparison with the traditional methods.
Logvinenko P.N., Ryabov S.V., Shevehenko V.V., Dmitrieva T.V.
Polymer and oligomer containing water-based dispersion media for machining metals by abrasion. pp. 439--445
Summary: Results are demonstrated of the studies of the rheological features, surface tension and dispersing effect of water solutions, double-anchor oligomeric surfactants and binary oligomer - polyacrylamide solutions. Synergism has been established of the dispersing effect of the components of binary solutions when abrading the alloys of iron, copper and aluminium, the extent of it manifestation reaches 460 when polishing steel, 260% -- bronze, and 140% -- the aluminium alloy. The features of the dispersing effect of the water-based binary oligomer-polyacrylamide solutions is due to the appearance of intermolecular oligomer-polymeric complexes evidenced by the existence of a threshold concentration of oligomers in the binary solution.
Tarasov V.V.
Multifunctional computerized minitribometer. pp. 446--448
Summary: The design of a computerized minitribometer is demonstrated for studying the anisotropy of friction and wear resistance of fine coatings.
Shaginyan A.S., Andrianov D.N.
Methods of calculation of the viscous friction coefficient in the test machines hydrocylinders. pp. 449--452
Summary: On trials of materials with the help of hydraulic or electrohydraulic test-machines for estimation of the dynamic errors during measuring of forces and deformations of material specimens being tested it is necessary to calculate the viscous friction value in the power circuit of the "test machine--specimen" system. This paper deals with the calculation of viscous friction coefficient in the hydrocylinder of test machine.
Chjay Yujshen, Li An, Uan Dinguan, Chjan Dinchjun
A method of indistinct evaluation of the performance of the drill rig brakes. pp. 453--459
Summary: The performance of drill rig belt brakes has been evaluated using the theory of system analysis, modelling, dimensional and multifactorial analysis. The major factors have been identified governing the triboengineering characteristics of friction couples. The methods of indistinct mathematics have yielded a model for exhaustive evaluation of the performance of friction couples. The matrix analysis has been employed to evaluate the factors affecting the studied materials, it has allowed to identify the surface layers at different cross section levels and to use these factors in the new method of evaluating performance of triboengineering materials.
MEN OF SCIENCE
Valery V. Shevelya (60 years since Birthday). p. 460
CONFERENCE CALENDAR p. 461
ADVERTISEMENT p. 462
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Copyright © 2000 The National Academy of Sciences of Belarus
Copyright © 1999 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
