Ìåæäóíàðîäíûé íàó÷íûé æóðíàë
Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü
|
ÒÐÅÍÈÅ È ÈÇÍÎÑ Ìåæäóíàðîäíûé íàó÷íûé æóðíàë Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü |
Mozharovskii V.V., Rogacheva N.A.
Stress-strain state of the elastic homogeneously coated orthotropic base with the account of friction. pp. 471--479
Summary: The method of solution in stresses has served to elaborate a mathematical model for calculating the stress-strain state of a composition with an isotropically structured layer adhering to the fibrous composite base. The stress - strain of the coating are analyzed together with the tangent forces along the upper interface of the coating. Features how the arrangement of fibers in the base affects the pattern of stresses in the composition have been identified
Galaj E.I., Balakin V.A.
Tests and heat calculation of railway shoe brakes. pp. 480--488
Summary: Results of full-scale tests of railway shoe frictional brakes are analyzed. Calculation of the temperatures of friction surfaces of shoes of various thickness is demonstrated with the account of heat rejection into the environment.
Vlasov V.M., Malenko P.I., Zelenko V.K.
A model of diagnostics of continuously lubricated friction surfaces using acoustic signals. pp. 489--495
Summary: Frequently expensive full-scale tests are necessitated by the lack of valid methods of friction surface diagnostics when a material is selected, the modes of its hardening are validated and stand tests are carried out. The article analyzes a theoretical model of acoustic diagnostics and demonstrates the results of its experimental validations using a specific case of friction of continuously lubricated nitrided heat resistant steel. Guides how to diagnose friction surfaces are based on the condition of local contact spots rated with the help of the numerical values of the coefficient mloc derived by comparing theoretical and experimental data.
Gekker F.R., Zaitsev S.A.
Friction of roughnesses in limits of elastic deformations. pp. 496--499
Summary: The contact of two elastic roughnesses is considered from the position molecular-deformation theory. The friction forces between two bodies with such roughness are defined.
Shaginyan A.S., Bolotskii V.V., Zakharov A.V.
Analysis of the effect of viscous friction and forces of inertia upon the dynamic performance of the electrohydraulic converter. pp. 500--505
Summary: The electrohydraulic converter with the hydrobooster of the "nozzle--gate--slide valve" type with a resilient feedback is described mathematically with the consideration of viscous friction and forces of inertia and their effect upon the dynamic performance.
Bulanov E.A.
Wear of tooth wheels. Part 1. Wear of lubricated wheels. pp. 506--514
Summary: The mechanism of friction fatigue has served to advance a general regularity of wear of tooth wheels induced both by abrasive impurities or without them. Experimental studies of wear of tooth wheels without abrasive impurities corroborate the advanced regularity,
Yakunin N.N.
Transient lubrication process in sliding bearings. pp. 515--519
Summary: An approach has been elaborated to control the performance of sliding bearings in mechanical systems using the parameter Px of the transient lubrication processes characterized by the duration of the lubricating layer in the sliding bearing. A relationship between this parameter, the loading and velocity conditions, design and service condition of the kinematic couple is analyzed. The sphere of optimal application of this parameter is determined as a function of the operation conditions and the service condition of bearings,
Shevelya V.V., Dworuk V.I., Kalda G.S., Radchenko A.V.
The mechanics of fretting wear and fretting fatigue of metals. pp. 520--526
Summary: The results offretting fatigue tests of specimens from armco iron, steel 45, 30XÃCA and 40XHMA, alloy D16T, are demonstrated. The effect of the number of the fretting cycles, the sliding amplitude upon local wear, the critical stress of microflow after fretting and fatigue accumulation, residual durability of the specimens, have been investigated. It is demonstrated that the more the microplasticity of the surface layer in the process of preliminary fretting is exhausted the more the hardness and durability reduce under the effect of subsequent loading.
Kovalchenko A.M.
Wear of cutting nitride ceramics during friction against different types of steel depending on sliding speed. pp. 527--532
Summary: Wear of silicon nitride and ceramics of the b-sialon-TiN system during friction without lubrication against different types of steel (carbon steel St3, carbon structural steel St45, structural spring steel 65G, carbon tool steel Y8, corrosion-resistant, heat-resistant martensitic steel 20X13 and corrosion-resistant, heat-resistant austenitic steel 1X18H9T) in speed range from 1 to 6 m/s was studied. Wear mechanism of ceramics during friction against tool and carbon structural steels has the resembling mode and the similar trends in its change with sliding speed increasing are displayed. Wear data are characterized by nice reproducibility. Intensive seizure and increased wear of ceramics as well as steels during ceramics friction against corrosion- and heat-resistant steels are observed. Similar trends in the change of wear with speeds were not revealed. Wear data in this case are characterized by poor reproducibility.
Voronin N.A.
Topocomposites -- a new class of structural materials for tribological applications. Part 2. Methodological problems of creating and designing. pp. 533--544
Summary: Types of damage and failure making the topocomposite unfit for further use and their fabrication and contact with other solids in friction are analyzed. Criteria are advanced to rate the rejection limits for the considered types of damage. Theoretical and experimental means of solving contact problems and evaluating the applicability of topocomposites are considered. Leading problems of studies are treated.
Gorokhovskii G.A.
The mechanism of brinelling working surfaces of rolling bearings. pp. 545--549
Summary: The track of rolling is damaged (brinelled) by preliminary, protracted loading of the ball and the track in the presence of a lubricating material. The fine crystalline structure in the contact zone is modified, it softens and a prefailure nucleus originates. In rolling the moving balls and products of mechanical cracking of the lubricating material produce a pit in the prefailure nucleus.
Savanchuk R.V.
The study of the local distribution of hydrogen in the metal junctions of friction. pp. 550--554
Summary: The methods of sample making and carring out the local analysis of dressing metals with hydrogen in the process of friction were worked out using the method of local laser sample selection in the inert gas flow in reference to the research of metal surfaces, dressing them with hydrogen in the process of friction. The behaviour of hydrogen on "the friction trackels", formed while a sample is moving on the surface of another one considering the samples and the type of junction of friction was studied. The concentrated profiles of hydrogen distribution on the surface of the metal samples for different depth of sample selection were made -- from 10 to 600 micrometers and locality from 100 to 500 micrometers.
Ginzburg B.M., Tochilnikov D.G., Shepelevskii A.A., Budtov V.P., Pugachev A.K.
The effect of fulleren carbon black upon the tribological behavior of fluoroplast-4 and fluoroplastic composite F-4K20. pp. 555--562
Summary: Introduction of fulleren black (1 mass %) into the fluoroplastic F-4 improves its friction resistance by reducing the dry sliding friction coefficient over steel by 25--35% (within the contact pressure range 0.2--2.0 MPa) and expands the pressure working range. It also improves noticeably the F-4 wear resistance. Tests of the fluoroplastic composite F-4K20 in boundary friction have manifested that introduction of the fulleren black reduces its friction coefficient over steel by 10-50% (to the level below 0.1 typical for the pure F-4) within the contact pressure range 1-7 MPa with the corresponding gain in wear resistance compared with pure F-4.
Choi Ung-su, Ahn Byung-gil, Kwon Oh-kwan
The temperature dependence of the electrical and rheological characteristics of chitosan suspension as a new ER fluid. pp. 563--569
Summary: The electrical and rheological characteristics for chitosan suspension were investigated by varying electric fields, volume fractions, shear rates and temperatures. Chitosan suspension showed the ER response (Bingham fluid behavior) upon application of the electric field. It is caused by the polarizablity of the branched amino polar group of the dispersed phase, chitosan particles. The shear stress for the chitosan suspension exhibited a linear dependence on the volume fraction of particles the squared electric field and dielectric mismatch parameter. On the basis of the experimental results, it has been correlated with the polarization model and found to a new ER fluid.
ÕÐÎÍÈÊÀ. pp. 571--573
ADVERTISEMENT. p. 574