A. Yu. Albagachiev's research while affiliated with Moscow State University of Mechanical Engineering and other places
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Publications (47)
The authors have developed a combined processing method for obtaining modified surfaces. A theoretical and experimental study of surface undulation is presented. Comparative wear tests have shown the advantages of the proposed technology in comparison with traditional hardening methods - HFC hardening and electromechanical processing
The study objective is a comparative analysis of the effect of nano-additives in engine oil on reducing the friction factor during upsetting. The task to which the paper is devoted is to obtain lubricants with different concentrations of fullerenes (C60) and analyze comparative tests of lubricant compositions. Research methods: lubricating composit...
The article proposes a model of temperature during drilling and an automatic control system for the drilling machine, which allows maintaining the optimum temperature.
The problem of the indenter embedding into a half-space is formulated and solved. A concept of the elastic contact is used, which implies the uniformity of the stress-strain state in a surface layer. The process of the surface layer formation after mechanical treatment is studied. Based on the general theory of indenter penetration into a half-spac...
The temperature is analyzed in the machining of a one-piece compressor impeller, by simulation. The results obtained by means of the proposed algorithm are presented.
A mathematical model and methodology for calculating the temperature during mechanical processing of the compressor monowheel are developed. The calculation results according to the developed algorithm are presented. Keywords modeling, monowheel, milling, temperature. albagachiev@yandex.ru
![Fig. 1. Relationship between friction coefficient and temperature [3]](profile/A-Gerasimova/publication/342941592/figure/fig1/AS:1076178299416578@1633592309595/Relationship-between-friction-coefficient-and-temperature-3_Q320.jpg)
The paper presents the study of the process of lengthwise rolling. This process is characterized by elastic-plastic deformation, slipping friction, seizing friction, rest friction arising in the contact area between rolls and
strip. The rolling process during the contact between rolls and strip is described, as well as rolling forces causing elasti...
The article considers the phenomenology of the topochemical kinetics of the formation and growth of adhesion cores, as one of the main processes of the kinetic approach in the theory of fracture of materials during friction. The basic provisions of the models and laws of the formation and growth of setting nuclei are investigated. Peculiarities of...
The loading pattern of a transport-loading facility of a flexible manufacturing system for the treatment of base members was proposed in this article. The dependences allowing determination of the loading coefficient of the transport-loading facility for different types of work were found. Methods for loading reduction of the transport system and o...
Laser welding is shown to be preferable to traditional soldering in the assembly of nonferrous and mineral components. Welding conditions that prevent cracking of minerals are presented.
The temperature rise in the cutting zone during high-speed milling is considered. A method of calculating this temperature rise is proposed.
Existing recommendations regarding the high-speed milling of metals are considered. To optimize the cutting temperature, an inverse method of determining the best cutting speed in the turning of KhN77TYu high-temperature nickel alloy is proposed. MathCAD software is used to calculate the machining conditions.
The prospects for additive technology in facilitating the manufacture of components for gas-turbine engines are considered. The expediency of electron-beam melting (EBM) in the manufacture of monowheel impellers is considered.
This paper describes an upgraded installation, a procedure, and results of lubricants testing with respect to use in the executive mechanisms of space vehicles.
![Volatility of base oils from [8]](profile/Maksim-Prozhega/publication/327268486/figure/tbl2/AS:941712667054084@1601533204692/Volatility-of-base-oils-from-8_Q320.jpg)
![Characteristics of Russian greases for space [11]](profile/Maksim-Prozhega/publication/327268486/figure/tbl3/AS:941712667074565@1601533204715/Characteristics-of-Russian-greases-for-space-11_Q320.jpg)
A comparative analysis of the main types of greases and base oils for their manufacture that are used for lubricating mechanisms operating in space is performed. Their differences in terms of chemical composition, volatility, and operating temperature range are analyzed. The research results on the tribological properties of lubricating greases and...
The study of working surface deformation during interaction of open-pit locomotive tires allowed defining outstanding features of phenomena occurring in the contact area of interacting surfaces. It was found that processes typical for plastic saturated contact occur in the area of wheel-rail interaction of industrial railway transport. In case of p...
Copper-based coatings obtained by nonabrasive antifrictional finishing in a metal-coating bath increase the wear resistance of frictional pairs by a factor of 2.2 and prevent the diffusion of hydrogen into the surface layers of the steel.
The kinetics of external friction is compared with the molecular–mechanical theory of friction. It is shown that research on the topochemical kinetics of adhesive binding is still in its early stages. Calculation methods that incorporate experimental data must be developed.
The mechanical and tribological properties of thin vacuum-arc deposited coatings of amorphous carbon in an unalloyed state and alloyed with nitrogen have been investigated especially the peculiarities of their frictional fatigue failure.
The relationship between the wear rates of materials and the hydrogen formation in the friction zone has been confirmed based on the working hypothesis. A study has been performed in order to identify the correlations between these processes for different materials of parts for fuel pumps and different lubricating media. Regression equations have b...
The hardness and frictional coefficients of two-layer coatings are investigated. The coating life of steel samples is investigated on the basis of its elastoplastic deformation and the microhardness before and after testing on a frictional machine. The two-layer Mo2N + Mo coating considerably outperforms the steel in terms of microhardness. The lif...
The influence of surface microprojections—their shape and additional harmonics—on the elastic contact of a flat surface and a surface with regular microrelief is considered on the basis of the elastic contact of a half-plane and an undulatory surface. It is shown that the contact-pressure curve depends on the surface gradient of the microprojection...
The factors that affect the wear and durability of artillery systems are considered. The dependence of the barrel wear on the number of shots fired is determined experimentally. The use of wear-free technology in barrel manufacture reduces the wear by an order of magnitude and thus extends barrel life.
Friction and wear between the casing of the control rod and the reactor housing with cyclic rod motion and circulation of high-temperature molten lead in the annular gap.
The simulation of surface irregularities is considered. An algorithm is developed for generating a three-dimensional model of an irregular surface on the basis of surface-layer parameters and formulas for the shape of a single surface irregularity after abrasive machining.
Citations
... Nanoparticles can reduce the friction coefficient and present a self-restore effect. Nanoserpentine and nanokaolin particles are widely used as self-restore additives [1][2][3]. Both can reduce the friction coefficient and produce a self-restore layer on a friction surface in high friction temperature and high pressure [4]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/647643298553859-1531421603728_Q64/I-Buyanovskii.jpg)
... Due to the extremely high chemical activity of FNs, when they enter the melt of the workpiece material, they must first intensively bind, forming complexes, with the melt particles (which, most likely, can ensure the absence of their "slippage" relative to the latter), and then build a fractal grid with the participation of these complexes. A typical example of such a structure is shown in Fig. 1, [8]. In view of the fractal nature of the structure, it is of interest to determine the fractal dimension. ...
... The heat treatment mode efficiency is determined not only by the operation requirements basis [26], but also by its manufacturability and durability, as well as cementite mesh crushing intensity. Known heat treatment modes do not always allow high carbon steels to be used for pre-finishing and finishing stands, as they do not meet the wear resistance requirements. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/858369749430274-1581662704486_Q64/A-Gerasimova.jpg)
... The overall change in average Ra was 45-63% over dry cutting and 23-43% over flood condition in comparison with MQL strategy. The fact that the heat rises as a result of the increase in Cs facilitate plastic deformation and flow of chip resulting in a decrease in Ra [35]. The highest value formed under dry condition was 1.35 μm. ...
... excellent corrosion, superior wear resistance, and fatigue resistance above 800-900ºC (than the other conventional materials) have contributed significantly toward its widespread applicability. [21,22] Besides, Inconel 718 retains its mechanical strength (at room temperature); at about 1375 N/mm 2 (tensile strength), which decreases by 20% of its value to about 1100 N/mm [2] at 650ºC. [23][24][25][26] As a result, most of the aircraft structures and critical temperature sections of Table 1. ...
... The most common PBF techniques in the industrial field are laser PBF (L-PBF), also known as selective laser melting (SLM), and electron beam melting (EBM) [25]. Among the metal AM processes, EBM has been already used for mass production for aerospace and medical applications [26,27]. EBM is able to build complex geometry workpieces with high precision [28][29][30]. ...
... Molybdenum disulfide coatings are actively used to reduce friction [1][2][3]. In aerospace field, such coatings are used to prevent friction in friction units; in the oil and gas industry, threads are coated to prevent sticking; in nuclear fusion facilities they are used to protect fixing articles in construction elements of tokamaks (ITER, France; JET, England) and stellarators (Wendelstein 7-X, Germany) [4][5][6][7]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/876673750794242-1586026718435_Q64/Maksim-Prozhega.jpg)
... And seizing area consists only of rest area. If l/h relationship is more than 5.0, three friction areas are observed on a bite curve: slipping, seizing and rest friction [7][8][9][10][11][12]. ...
... Especially new materials are needed for friction units. The reliability and service life of machines and devices is mainly limited by the performance of friction units (Vagin et al., 2017). The efficiency of a friction unit depends on the tribological properties of the materials used in movable connections of machine parts. ...
