Трение и износ, 1996, Vol.17, No.5

Трение и износ, 1996, Vol.17, No.5

ТРЕНИЕ И ИЗНОС
Международный научный журнал
Published by INFOTRIBO Ltd., Gomel, Belarus

Том 17, номер 5; сентябрь-октябрь, 1996

СОДЕРЖАНИЕ

СТАТЬИ

Beresnyakov A. I.
On the interrelation of friction and surface acoustic emission. pp. 573--578
Summary: The acoustic model of the boundary friction process is elaborated, where the transformation of the surface Rayleigh waves into the body acoustic waves is considered with account of the damping on the dislocations. The dependence, similiar to the inverse resonance curve, between the specific frictional force and the frequency of the Rayleigh waves was obtained. It is shown that the specific frictional force is proportional to the wave length of microrelief of the surface and inversely proportional to square of the surface density of the dislocations.

Pokropivnyi V. V., Skorokhod V. V., Pokropivnyi A. V.
Atomistic simulation of adhesion and wear of atomic-sharp tungsten stylus against iron surface. pp. 579--588
Summary: Mechanism and elementary act of adhesion and wear of atomic-sharp tungsten stylus over a-Fe-(114)-surface were computer simulated at atomic level. Correlation of calculated energy and force of adhesion, viscosity, force of internal and external friction with transformations of atomic structure was investigated during friction in constant gap and constant force modes.

Balakin V. A., Sergienko V. P., Komkov O. Yu.
Heating at engagement of frictional clutches and brakes. pp. 589--597
Summary: Friction force dependence on time at engagements of clutches and brakes is considered. Formulas are presented for calculation of average temperature in linings and drums of clutches and brakes at their engagement.

Voitov V. A., Isakov D. I.
Modelling of boundary friction in tribosystems. III. Mathematic modelling of nonstationary processes. pp. 598--605
Summary: The methodology of mathematical modelling of friction under the conditions of boundary lubrication is introduced. The differential equations of transitional processes for wear rate, and friction force are obtained. The solution of differential equations permits to define rational running-in processes, the duration of stable work, and the tribological characteristics. The methodology gives an opportunity to reduce time of laboratory and bench testing.

Zakharov S. M., Zharov I. A.
Tribological criteria of workability evaluation for crankshaft bearings of internal combustion engines. pp. 606--615
Summary: The requirements to crankshaft bearings performance criteria are formulated. The deviation index characterising shaft angular displacements is introduced. Basing on curves with equal bearing scoring probability plotted in the coordinate axes "minimum oil film thickness" versus "deviation index", method of bearing scoring prediction is suggested. The generalized criterion characterising both the minimum oil film thickness and the deviation index is suggested. This criterion enables to evaluate bearing wear rate considering hydrodynamic and mixed lubrication conditions.

Merslyakov A. A., Mashkov Yu. K.
Thermoelastic stress-strain state of combined ring--ring seal. pp. 616--620
Summary: The solution of the stress-strain state problem of a combined seal is suggested when used thermoelasticity theory. The obtained solution has been used for determination of contact pressure and friction temperature.

Pyr'ev Yu. A., Mandzik Yu. I.
An analysis of thermoelastic contact stability of a cylinder radial seal. pp. 621--628
Summary: Frictional thermoelastic instability in the contact problem of a radial seal is examined. The critical value of the relative velocity of such a system is presented. A qualitative character of the dependence of this critical relative velocity on all important parameters of the system is investigated.

Nazarov A. D.
The influence of some technological errors and increasing of mass of crank parts on durability of engines. pp. 629--636
Summary: It is established that the increasing of deviation of mass and geometric parameters of parts of crank and connecting rod mechanism increases the parameters of wear of main bearings of crankshaft, deteriorates vibroacoustic behavior, and, reduces the resource of engines. The ways of decreasing of above mentioned parameters, the reducing of vibration and noise, and the increasing of engines durability are shown.

Potekha V. L., Rogachev A. V., Shcherek M. M., Pekoshevskii V. V.
Precision control of wear in sliding friction units. pp. 637--643
Summary: Design of precision device for measuring the linear wear and heat expansion in sliding bearings. Test data evidence that roughness and load-velocity conditions effect the wear rate and heating in the bearings.

Antsiferov V. N., Latypov M. G., Shatsov A. A.
Ferrotics with metastable matrix. pp. 644--652
Summary: Methods of producing carbide steels containing relatively small concentration of hardening phase are discussed. Mechanical and tribotechnological properties of ferritics which contain TiC up to 40% of its mass are investigated. Improvement of mechanical properties and wear resistance at realization of gamma--alfa transformation is shown. Superiority was proved of metastable matrix with set level of non-uniformity of distribution of alloying additions.

Sorokin G. M., Malyshev V. N.
Wear criteria of coatings formed with microarc method. pp. 653--657
Summary: Based on the analysis of experimental data on coatings' wear, formed with microarc method criteria of their wear resistance are proposed. Those criteria are dependencies of wear on the mechanical properties, some of them are determined with the kinetic microhardness method and other ones -- with geometrical index (fractal dimension).

Sladkova L. A.
Wear of teeth of a screw drill. pp. 658--664
Summary: Design is considered of screw drills used for frozen soil drilling under conditions of the North. Model of drill teeth wear is proposed and calculations are confirmed by testing data.

Kharchenkov V. S., Pogonyshev V. A., Khokhlov G. A.
Technological provision of fretting resistance for truck components. pp. 665--669
Summary: Method of improving the fretting resistance of truck components by coating them with multilayer films is presented. It is shown that films consisted of materials with different modulus of elasticity are most efficient.

Kholmyanskii M. M.
Friction in steel--concrete precompressed contact. pp. 670--676
Summary: Shear, adhesion and friction bonds between steel and concrete are employed in reinforced concrete members and their joints. The compliance and strength of friction bonds are considered when mutual shear is accumulated in the damaged layer being thicker than the contact layer. This feature restricts the application of modern tribological ideas making the "law of friction" more appropriate as a dependence between motion and shear resistance. Experimental investigation of the law of friction is presented taking account of the pressing force and surface profile of the steel member characterized by the relative area of strain.

Bobrysheva S. N.
Using wastes of meat packing and margarine plants as components of the lubricants. pp. 677--681
Summary: Regularities of the biological tribosystems functioning were used to solve engineering tasks. The designed coolants, compositions for wood impregnation and greases realizing liquid-crystalline state of the lubricant significantly reduce friction coefficient and wear, increase load capacity of corresponding friction assemblies.

Gartman E. V., Mironovich L. L.
Wear-resistant protective polymer coatings. pp. 682--685
Summary: Pentaplast wear-resistant coatings having high chemical stability are recommended for use in agressive media. Nickel powder is used as a filler of polymer matrix in order to increase heat their conductivity. Powder particle size is shown to effect wear of pentaplast coatings.

Delikatnaya I. O.
On the estimate of lubricant components effect on sliding friction. pp. 686--689
Summary: An investigation concerning different lubricant components (fatty acids and their esters) effect on friction coefficient variation depending on contact materials and friction conditions has been carried out. The variation regularities are shown to depend upon friction joint velocity and its loading. An estimation of the lubricants adhesion has been made as related to their spreading kinetics from a vertically disposed substrate. It was noted, that the substrate preliminary treatment with a fluorine-containing oligomer of the Foleox type leads to formation of a thicker lubricating layer interacting with the substrate, as well as to reduction of the friction coefficient.

Novitskii V. G., Tikhonovich V. I., Kalchuk N. A.
Effect of alloing of cast chromium steel on its wear at rolling. pp. 690--693
Summary: The influence of manganese, nickel, and copper alloying on the forming of 110X15 steel near-surface layers structure was investigated. It was established that maximal durability of internal 1 10X15 steel bearing ring is observed at the maximal density of dislocations and the second and third distortions kinds under minimal value of the complex defect packing concentration (1.5a + b) in initial structure.

Smurugov V. A., Rusyi V. Kh., Shelobod L. I., Savkin V. G., Khalapsina T. I.
Processing lubricant-coolant for cold drawing of hard-deformable materials. pp. 694--698
Summary: Tribotechnical properties of engineering lubricant based on vegetable oil fluxes and technical fats containing dispersed polyacrylonitrile fibers as fillers have been studied. It has been shown that at friction the fibers are easily deformed and form a stable interlay between rubbing surfaces. This provides high lubricant properties under cold drawing of metals.

Shelestova V. A., Ivanov L. F., Grakovich P. N., Ozolin A. A., Koval I. V.
Introduction of PTFE short fibres in carbon contained polymer composites as a method for advancing their wear resistance. pp. 699--702
Summary: A new method of PTFE introduction in carbon-contained polymer composites is developed. It is based on the idea of preliminary making of complex filler -- PTFE-carbon fibres prepreg. Technological peculiarities of production of CFRP with PTFE filler as well as its tribological, physical and mechanical properties are investigated.

ИСТОРИЯ ТРИБОЛОГИИ

Khrushchov M. M.†
Note on the history of the elasto-hydrodynamic lubrication theory development. pp. 703--706
Summary: One of the Russian tribology pioneers the late Prof. M.M. Khrushchov (1890--1972) has assisted at the early beginning of the elasto-hydrodynamic theory of lubrication proposed by the Soviet physisist A.M. Ertel. The paper is devoted to some aspects of A.M. Ertel's history and confirms the priority of A. Mohrenstein-Ertel in the EHL field.

ОБЗОРЫ

Introduction to tribology. Textbook. I.G. Fuks and I.A. Buyanovskii. Moscow, Oil and Gas Publishers, 1995. (Reviewers: D.Sc., Prof. Ye.D.Braun and D.Sc. Yu.A. Podolskii) pp. 707--708.

КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. p. 709.

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