Трение и износ, 1999, Vol.20, No.2
/ Издания академии / Научные журналы
Трение и износ, 1999, Vol.20, No.2
Том 20, номер 2; март-апрель, 1999
СОДЕРЖАНИЕ
СТАТЬИ
Petrokovets M.I.
Effect of temperature on the area of real contact of rough surfaces. pp. 119--124
Summary: The real contact area of rough surfaces is calculated in the case when there exists a heat flow through their contact. It is shown that under a certain combination of thermal and mechanical properties of the mating materials the real area may pass a minimum as the temperature increases. The minimum is governed by concurring action of a thermal expansion of the material and a reduction of its mechanical characteristics in response to frictional heating.
Evtushenko A.A., Evtushenko E.A.
Thermal Processes in Metals During Cold Rolling. pp. 125--131
Summary: A scheme is advanced to calculate the coefficient of heat and temperature separation in the zone of contact between rolls and a cold-rolled strip. A numerical validation has been performed for the rolling of the stainless steel strip,
Chichinadze A.V., Kurochka P.N., Polyakov N.V., Klyuchnikov V.I.
Assessment of temperature flashes in the friction microcontact. pp. 132--136
Summary: An analytical solution of the temperature problem for dry and lubricated friction microcontacts in brakes is proposed. The characteristic relationships between the level of the temperature flash are presented as a function of its duration, the microprojection size, the oil film thickness.
Halay E.I., Balakin V.A.
Heat conditions of a highly powerful railway friction brake during the transition period of the braking power rise. pp. 137--143
Summary: Ann approximate method is considered how to estimate the heating of brakes of the railway rolling stock.
Chekina O.G., Kozhaev A.Yu.
Simulation of Leaks through the Seals of Rotary Shafts. pp. 144--151
Summary: Motion of a liquid in the seals of rotating shafts is investigated to reveal the causes of leaks and a simultaneous lubricating effect. This process is considered as a motion of discrete liquid microvolumes trapped by the rough surfaces of the shaft and the neck. In case the surface relief is periodic, the typical processes of leaks have been determined analytically; the characteristics of the process evolving in the interface between rough surfaces have been determined with the help of computer simulation.
Bufeev V.A.
The Tangential External Friction Effect and the Conditions of Manifestation. Part I. pp. 152--158
Summary: A formula is demonstrated and the essence of the tangential external friction phenomenon (the tangential triboeffeet) is analyzed after it has been first discovered experimentally during friction of clayey soils (sandy soils). The results obtained experimentally correlate with the theoretical assessment of the magnitude of the tangential triboeffect in such soils.
Grigoriev A.Ya., Chang R., Yoon E.-S., Kong H.
Wear particle classification by semantic features. pp. 159--166
Summary: A method of wear particle classification based on using of qualitative morphological features is discussed. Initial semantic features are represented as a vector of encoded values. Classification is carried out by comparison of descriptions of analysed and standard particles. The descriptions of the standards are formed by experts interview. The distance between the particles in the multidimensional feature space are used as measure of similarity. Particle class is determined as a class of closest standard. The obtained results show that the recognition accuracy of the proposed method is good enough for the solving of practical problems,
Dzhanakhmedov A.Kh., Eyvazova Z.E., Vahidov M.A.
Theoretical fundamentals of designing a lubricating device for rocking sliding bearings. pp. 167--174
Summary: Fundamentals of a theoretical calculation of new designs of lubricating devices for rocking plain bearings. Unlike the existing devices, such new designs are capable to trap and deliver oil to lubricate surfaces of reversible rocking bearing journals. So, the journal has two oppositely directed scoops, one dives into the oil and fills up, meanwhile the other ascends and delivers oil to the bearing. Thus the scoops alternate in operation. The theoretical analysis revealed the quantities of delivered oil depending upon the characteristics, design and performance of parameters of the new lubricators. An equation has been derived of the balance of the effective forces along the pipe string axis and formulas for calculation have been determined suitable to be used for engineering new lubricating systems,
Zhuravlev G.A.
The tribological factors and development of tooth gears. pp. 175--188
Summary: The influence of the different factors on contact phenomena in tooth gears has been analysed. It has been shown that for involute tooth gears there are significant reserves of increase of contact durability, but there is the absence of universal optimum value of a pressure angle or its extreme achievable value. Furthe prospective trends in research are proposed.
Baranov V.M., Kudryavtsev E.M., Sarychev G.A.
On interrelation between the amplitude distribution of acoustic emission signals and the statistical parameters of rubbing surface. pp. 189--192
Summary: Method was proposed for estimating a variation in roughness parameters which is based on recording of amplitude distribution of acoustic emission signals during friction. The results which lend support to the validity of the method advanced are given.
Fadin Yu.A., Kozyrev Yu.P., Bulatov V.P.
Evaluation of abrasion-induced mass losses based on acoustic emission data. pp. 193--196
Summary: A method is proposed to evaluate variations of roughness of friction surfaces by determining the parameters of amplitude distribution of acoustic emission signals registered in the process of friction. The demonstrate results prove the validity of the proposed methods of evaluating roughness parameters.
Markova L.V., Konchits V.V.
A new approach to studying the interface surfaces of rubbing bodies and interpretation of the data yielded by tribotests. pp. 197--203
Summary: The new approach to studying tribosystems is based on the analysis of the artificial digital imaging of physical parameters (the friction coefficient and contact electrical resistance) registered in the process of friction tests. It is demonstrated that this approach to the studies of friction couples yields information about variations of the condition of friction surfaces both in space (along local friction paths) and in time (from cycle to cycle).
Shevelya V.V., Kalda G.S.
Fretting effect upon resistance of metals to fatigue. Part I. Individual tests. pp. 204--209
Summary: Metallic specimens have been tested for bending after preliminary fretting corrosion. It is demonstrated that specimens primarily fail along the friction path under separate effects of contact and cyclic volume loads. Failure has been observed beyond the fretting zone in case of short duration of contact or at certain amplitudes of relative displacement and at specific loads.
Chulkin S.G., Pogodaev L.I.
Structural and energy model of the wear resistance of steel upon sulfonitrocementation. pp. 210--216
Summary: Investigation of the effect of sulfocyaniding (sulfonitrocementaation) upon the chemical composition, the structure, the triboengineering characteristics and wear resistance of specimens from steel - 20 which have been compared with the energy capacities of the surface metallic layers has yielded a structural and energy model of the behavior of sulfonitrocemented steel at sliding friction.
Burnyshev I.N., Tarasov V.V.
Wear resistance of silicide coated titanium alloys. pp. 217--220
Summary: It has been investigated how titanium alloys after they are siliconized by diffusion become stronger resistant to mechanical, corrosion and mechanical and fretting and corrosion wear compared With other current methods of chemothermal treatment (oxidation, carbooxidation, nitrocementation, etc.).
Krasnov A.P., Gribova I.A., Adericha V.N., Genin Ya.V.
On the specificity of thermofriction effect in polymer blends. pp. 221--227
Summary: The effect of chemical structure of the repeating unit, its irregularity, and physical structure of polyimides, synthesized from diaminodiphenyl ether and dianhydrides of 3,3',4,4'-diphenyloxidetetracarbonic acid (DPO), 3,3',4,4'-benzophenonetetracaibonic acid (BP) as well as diphenyloxidetetracarbonic acid and anilinefluorene (PIR-2) and their blends on tribochemical transformations and frictional properties is studied. Linear relation between the friction coefficients and softening temperatures is established. It is shown, that in the course of transfer molding DPO polyimide turns amorphous, while polyimide BP is annealed and ordered. Processing of their blends produces a heterogeneous system, comprising a crystalline polymer, amorphous polymer and a solid solution of the former in the latter one, which causes a non-additive increase of the impact strength coupled with high hardness and softening temperature as well as improved frictional behaviour.
Okhlopkova A.A.
Application of natural zeolite for improving triboengineering characteristics of polytetrafluorethylene. pp. 228--232
Summary: Mechanophysical, triboengineering and thermodynamic characteristics of polytetrafluorethylene have been studied to asses the changes produced by the natural zeolite and mechanical activated zeolite fillers. It is demonstrated that the energy state of the fillers significantly determines the process of appearance of the supermolecular structure of the polymeric matrix and the resulting behavior of the composite.
КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. pp. 233--234
/ Издания академии / Научные журналы / К началу страницы
Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: November 12, 1999
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 1999 The National Academy of Sciences of Belarus
Copyright © 1999 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
