4_2019_sen_12

Title of the article

LAW OF FRICTION: FROM TRIBOLOGY TO TRIBO-FATIGUE. REPORT 3. EXPERIMENTAL STUDIES
Authors

SOSNOVSKIY Leonid A., D. Sc. in Eng., Prof., Director, S&P GROUP TRIBOFATIGUE Ltd., Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section TRIBO-FATIGUE SYSTEMS MECHANICS
Year 2019 Issue 4 Pages 95–106
Type of article RAR Index UDK 620.178.16; 620.178.3 Index BBK  
Abstract To date, many laws of nature have been discovered. The knowledge of each of them led to the accelerated development of the relevant sections of Science and further, as a rule, to progress in any practical area of the community of people. The empirical law of dry friction [1, 2], first formulated by Leonardo da Vinci 500 years ago, went down in history of technology as one of the most applicable laws in engineering calculations [3]. Moreover, our worldview is unthinkable without an understanding of the general processes of movement with friction (as well as movement without friction). All this gives grounds to say: “Friction is an amazing phenomenon of nature” (D. Garkunov). Two hundred years later (after da Vinci) Amonton M., Coulomb C.A., and Euler L. [4–7] made a decisive contribution to the substantiation and understanding of the law of dry friction, and it became classical: the force of sliding friction is proportional to the contact load. Studies show that the classical friction law for the tribo-fatigue system is inaccurate and, therefore, inapplicable. It was established experimentally that the error in estimating the coefficient of friction in a tribo-fatigue system (for example, a “wheel – rail” type, etc.) reaches 60...70 % or more, if we use the classical law of friction for its analysis. Therefore, there is a problem of adjusting the classical law of friction. A set of theoretical and experimental studies was carried out, the results of which make it possible to formulate a generalized law of friction: the friction force is proportional to both contact and non-contact volume loads, if the latter excites a cyclic stress (strain) field in the friction zone. This law describes all the experimental results (more than 100 values of the friction coefficient) with an error of no more than ± 6 %. The widespread use of the proposed generalized law of friction in the engineering is considered as a very urgent task. In conclusion of the article, some directions for further research (theoretical and experimental) are formulated. The article is published in three reports.
Keywords

friction law, tribology, friction pair, Tribo-Fatigue, tribo-fatigue system, friction force and coefficient, sliding, rolling, slipping, contact load, pressure, non-contact (volume) load, stress, strain
   
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4_2019_sen_11

Title of the article

ACCELERATION OF BOUNDARY-ELEMENT COMPUTING USING GRAPHICS ACCELERATOR FOR THE ELEMENTS WITH NONLINEAR FORM FUNCTIONS
Authors

SHERBAKOV Sergei S., D. Sc. in Phys. and Math., Prof., Deputy Chairman, Belarusian State University, Minsk, Republic of Belarus, Professor of the Department of Theoretical and Applied Mechanics, State Committee on Science and Technology of the Republic of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

POLESTCHUK Mikhail M., Ph. D. Student, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICS OF DEFORMED SOLIDS
Year 2019 Issue 4 Pages 89–94
Type of article RAR Index UDK 539.3 Index BBK  
Abstract The implementation of a boundary element method (BEM) using three nonlinear form functions designed for determination of half-plane potential distribution was considered in the current paper. The application of NVidia CUDA technology for parallel computing leading to the essential acceleration of computations was also performed. The accuracy of calculations performed with constant and nonlinear form functions was analyzed. The influence of the surface discretization on accuracy was studied. Parallelization technique for BEM using graphic processor was presented. Timings and acceleration coefficient dependencies on the number of boundary elements and calculation points were presented for sequential and parallel calculations.
Keywords

boundary element method, acceleration of computing, potential distribution, modelling, CUDA, graphics accelerator, parallelization
   
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4_2019_sen_9

Title of the article

STRUCTURE AND OPTICAL PROPERTIES OF COMPOSITE LIGHT-ABSORBING COATINGS OBTAINED BY MICROARC OXIDATION
Authors

KOMAROV Alexander I., Ph. D. in Eng., Head of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

TSYBULSKAIA Lyudmila S., h. D. in Chem., Leading Researcher, Research Institute for Physical Chemical Problems of the Belarusian State University, Minsk, Republic of Belarus

ZOLOTAYA Polina S., Junior Researcher of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

ROMANYUK Alexandra S., Junior Researcher of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

PEREVOZNIKOV Sergey S., Researcher, Research Institute for Physical Chemical Problems of the Belarusian State University, Minsk, Republic of Belarus
In the section MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2019 Issue 4 Pages 79–83
Type of article RAR Index UDK 621.762.2 Index BBK  
Abstract It is shown that the introduction of fullerene-containing soot (FCS) into silicate-alkaline electrolyte for microarc oxidation (MAO) of aluminum has a significant effect on the structural-phase state of the coating and its optical properties. In all cases, when it comes to thickness, various composite coatings are formed, its colors change from light gray to black, which leads to the appearance of a high-temperature phase of aluminum oxide, as well as to reflection in the visible spectrum and in the IR range.
Keywords

light-absorbing coating, microarc oxidation, fullerene-containing soot, composition, structure, reflection coefficient
   
Bibliography
  1. Komarov A.I., Vityaz P.A., Komarova V.I. Sozdanie iznosostoykikh uprochnyayushchikh pokrytiy mikrodugovym oksidirovaniem, neposredstvennoy i posleduyushchey modifikatsiey uglerodnymi nanomaterialami (monografiya) [Creation of wearresistant reinforcing coatings by micro-arc oxidation, direct and subsequent modification by carbon nanomaterials (monograph)]. Perspektivnye tekhnologii [Promissing technologies], 2011, ch. 6, pp. 114–148.
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4_2019_sen_10

Title of the article

STABILITY AND STRENGTH ASSESSMENT OF THE UNDERGROUND STRUCTURE ELEMENTS
Authors

ZHURAVKOV Mikhail A., D. Sc. in Phys. and Math., Prof., Head of the Department of Theoretical and Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

HVESENYA Sergey S., Head of the Research Laboratory of Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus

LAPATSIN Sergey N., Programming Engineer of the Research Laboratory of Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

NIKOLAITCHIK Mikhail A., Assistant of the Junior Researcher of the Research Laboratory of Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus
In the section MECHANICS OF DEFORMED SOLIDS
Year 2019 Issue 4 Pages 84–88
Type of article RAR Index UDK 51-74 Index BBK  
Abstract The paper considers an important problem of assessing the stability and strength of various elements of underground structures. The work complements the general scientific and methodological base of such concepts as “stability and strength of elements of underground structures” and forms the principles of selection the criteria of “stability and strength of elements of underground structures”. The proposed approaches and technologies are demonstrated on the examples of solving applied problems of geomechanics. The first of the problems considered is the problem of the strength of a multilayer rock massif during mining operations. The strength of the massif is evaluated based on various criteria. Some recommendations on the choice of strength criteria for this type of problem are given. The second problem is the problem of assessing the long-term stability of the underground structures of a large cross-section. The long-term stability of an underground structure of non-standard geometry is considered taking into account the rheological effects occurring in the rock massif.
Keywords

underground structures, strength criteria, rheological processes, finite element modelling
   
Bibliography
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4_2019_sen_8

Title of the article

FORMATION OF STRUCTURE OF HIGHLY FILLED UHMWPE COMPOSITES UNDER CONDITIONS OF INTENSIVE MECHANICAL ACTIVATION FOR RADIATION PROTECTIVE MATERIALS
Authors

ZHORNIK Viktor I., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KOVALIOVA Svetlana A., Senior Researcher of the Laboratory of Nanostructured and Superhard MaterialsSenior Researcher of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

GRIGORYEVA Tatyana F., D. Sc. in Chem., Leading Researcher of the Laboratory of Chemical Materials Science, Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the RAS, Novosibirsk, Russia

KISELEVA Tatyana Yu., D. Sc. in Phys. and Math., Associate Professor of the Department of Solid State Physics, Lomonosov Moscow State University, Moscow, Russia

BELOTSERKOVSKY Marat A., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

TARAN Igor I., Senior Researcher of the Laboratory of Gas-Thermal Methods of Machine Components Hardening1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

VALKOVICH Igor V., Researcher of the Laboratory of Nanostructured and Superhard Materials1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

VITYAZ Petr A., Academician of the NAS of Belarus, D. Sc. in Eng., Head of the Department of Mechanical Engineering and Metallurgy1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

LYAKHOV Nikolay Z., Academician of the RAS, D. Sc. in Chem., Chief Researcher, Lomonosov Moscow State University, Moscow, Russia
In the section TECHNOLOGICAL MECHANICS
Year 2019 Issue 4 Pages 70–78
Type of article RAR Index UDK 621.762.2 Index BBK  
Abstract The structural changes of the ultrahigh molecular weight polyethylene (UHMWPE) filled by 70 wt.% of the ultradisperse mechanocomposites Fe/M (M = HfC (12 об.%), TiC (26 об.%), TiB2 (27 об.%), B4C (51 об.%)) and activated by the treatment in the spherical ball mill, as well as when compacting of the filled mechanically activated polymer powder by hot pressing were studied by FTIR spectroscopy. It was shown that no significant changes occur in the molecular structure of unfilled UHMWPE during mechanical treatment with a low dose of mechanical energy (Dа ≤ 0.84 kJ/g). The change of the shape of powder particles is associated with the segmental mobility of macromolecules. The introduction of the filler leads to the formation of the interphase zone “polymer–filler” with a branched polymer structure. The degree of crystallinity (χ) of mechanically activated filled polymer powders with a dose Dа = 0.21 kJ/g is decreased relative to the mechanically activated unfilled UHMWPE with a dose Dа = 0.84 kJ/g from 44 to 25–40 vol.% depending on the nature of the filler. The oxidative destruction of the polymer during mechanical activation does not occur. The degree of crystallinity of UHMWPE of filled mechanically activated powders is increased to χ = 35–45 vol.% after hot pressing, but this value is 1.6 times lower than for the compacted unfilled UHMWPE. During hot pressing, the insignificant oxidation of the polymer occurs.
Keywords

mechanical activation, mechanocomposites, ultrahigh molecular weight polyethylene, filled polymers
   
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