3_2023_sen_4

Title of the article STUDY OF THE STRESS-STRAIN STATE OF THE MATERIAL AT THE CRACK TIP, LOCATED IN THE AREA OF THE STRUCTURAL CONCENTRATOR
Authors

TULIN Daniil E., Ph. D. Student, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russian Federation, 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 2023
Issue 3(64)
Pages 37–42
Type of article RAR
Index UDK 624.014
DOI https://doi.org/10.46864/1995-0470-2023-3-64-37-42
Abstract The influence of the stress concentrator is studied due to the design features of the welded metal structure of a loader crane on the stress-strain state of the material in the fracture process zone. Within the framework of the research, a physical criterion using the basic mechanical properties of the material is applied. A normal tear-off crack is considered under uniaxial loading conditions. FEM analysis of T-joint and lap welded joint models, as creating the highest stress concentration in metal structures of loader cranes, is carried out. A comparative analysis of calculation results for models with a crack in the concentrator area and models with a crack in a smooth plate is performed. The influence of the concentrator and its several parameters on the stress stiffness at the crack tip is shown. A general averaged estimation of the concentrator influence on the material stress state in the fracture process zone is proposed. Recommendations on taking into account the presence of the concentrator in analytical calculations are given.
Keywords welded joint, crack, stress concentrator, welding defect, brittle fracture, stress stiffness, finite element method, strength criterion
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3_2023_sen_3

Title of the article MODELING OF THERMOELASTIC-VISCOPLASTIC DYNAMIC DEFORMATION OF FLEXIBLE CYLINDRICAL REINFORCED SHELLS
Authors

YANKOVSKII Andrei P., D. Sc. in Phys. and Math., Leading Researcher of the Laboratory of Physics of High-Speed Processes, Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Science, Novosibirsk, Russian Federation, 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 2023
Issue 3(64)
Pages 25–36
Type of article RAR
Index UDK 539.4
DOI https://doi.org/10.46864/1995-0470-2023-3-64-25-36
Abstract A mathematical model of thermoelastic-viscoplastic flexural dynamic deformation of thin circular cylindrical shells with complex reinforcement structures is developed. Weak resistance to transverse shear and wave processes in such composite structures are modeled in the framework of Ambartsumyan’s non-classical theory of bending. The geometric nonlinearity of the problem is taken into account in the Karman approximation. The composition materials are isotropic; their plastic deformation is described by the relations of the flow theory with a loading function that depends on temperature and strain rate. The connection between the thermal and mechanical components of the problem under consideration is taken into account. In the transverse direction of structures, the temperature is approximated by a 7th order polynomial. The formulated nonlinear two-dimensional initial-boundary value problem is numerically integrated using an explicit scheme of time steps. The elastic-viscoplastic and elastic-plastic dynamic behavior of fiberglass and metal-composite long cylindrical shells, which are orthogonally reinforced in the circumferential and longitudinal directions, is studied. Structures are loaded from the inside with pressure, which is similar to the pressure in an air blast wave. It is shown that flexible fiberglass shells during axisymmetric deformation can experience additional heating by 11…13 °C at certain points. Metal-composite structures similar in geometry and reinforcement structure — by 40…60 °C. Thermo-elastoplastic calculations lead to an overestimation of the maximum temperature values in fiberglass shells by 1.0…1.5 °C compared to thermoelastic-viscoplastic calculations, and for metal-composite structures, on the contrary, to an underestimation of these values by 20 °C. It is shown that the calculations of fiberglass shells can be carried out without taking into account the thermal response in them, and it is advisable to calculate the dynamics of metal-composite shells, taking into account the temperature response in them. The dynamic behavior of both metal-composite and fiberglass structures must be calculated taking into account the sensitivity of the plastic properties of their composition components to the strain rate.
Keywords flexible cylindrical shells, complex reinforcement, dynamic loading, coupled thermoelasticviscoplasticity, Ambartsumyan’s bending theory, explicit numerical scheme
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3_2023_sen_1

Title of the article ON SPECIFICATIONS FOR MECHATRONIC CONTROL SYSTEMS FOR AUTOMATIC TRANSMISSIONS OF BATTERY ELECTRIC VEHICLES
Authors

KRASNEVSKIY Leonid G., Corresponding Member of the NAS of Belarus, D. Sc. in Eng., Prof. Chief Researcher of the Laboratory of Onboard Mechatronic Systems of Mobile Machines of the R&D Center
“Electromechanical and Hybrid Power Units of Mobile Machines”, 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.

PODDUBKO Sergey N., Ph. D. in Eng., Assoc. Prof. Director General, 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.

BELEVICH Alexander V., Deputy Director General for Highly Automated Electric Transport, 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.
In the section MECHANICS OF MOBILE MACHINES
Year 2023
Issue 3(64)
Pages 5–16
Type of article RAR
Index UDK 62-235
DOI https://doi.org/10.46864/1995-0470-2023-3-64-5-16
Abstract Battery electric vehicles with automatic transmissions are a new rapidly growing segment of electric vehicle and automatic transmission type configured for such applications. A promising direction of their development is integration of mechatronic control systems of automatic transmissions and electric drive, i.e. transition to integrated power units of battery electric vehicles. Pre-defined criteria are required to formulate the specifications for the design of the mechatronic control systems for such a unit. However, not only for mechatronic control systems, but also for battery electric vehicles with automatic transmissions themselves, sufficient experience in production and operation has not yet been accumulated, which determines the relevance of this article. Its purpose is to formulate approaches to the development of specifications on the emerging mechatronic control systems for automatic transmissions of integrated battery electric vehicles power units with automatic transmissions. The analysis (according to the formed information base) of the set of general requirements is carried out to the designs of close analogues — modern mechatronic control systems of automatic transmissions of hybrid electric vehicles, as well as the results of optimization of their parameters, characteristics and control algorithms of stage shifting processes of automatic transmissions for application in battery electric vehicles. It is shown that the compositions of basic functional properties of mechatronic control systems of automatic transmissions in battery and hybrid electric vehicles largely coincide. As a result, the composition of a set of basic criteria is formed for the evaluation of mechatronic control systems of battery electric vehicles. Based on the results of expert evaluation and analysis of analogues that meet modern requirements and are close to the types of domestic equipment, the basic specifications are proposed to the composition and functional characteristics of mechatronic control systems of automatic transmissions of power units of battery electric vehicles power (taking into account the private specifications to the subsystems included in them). The specification lists and their evaluation criteria include a number of established technologies in the global automotive industry. Taking into account that their practical application requires systematized information, which is difficult to find in the Russian-language presentation, the necessary explanations are given.
Keywords automatic transmissions, mechatronic control systems of automatic transmissions, hybrid electric vehicles, battery electric vehicles
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Bibliography
  1. Krasnevskiy L.G. Avtomaticheskie transmissii: analiz i perspektivy primeneniya na gibridnykh i batareynykh elektromobilyakh. Chast 1 [Automatic transmissions: analysis and prospects for use in hybrid and battery electric vehicles. Part 1]. Mechanics of machines, mechanisms and materials, 2020, no. 2(51), pp. 16–29 (in Russ.).
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3_2023_sen_2

Title of the article MINIMIZATION OF DEGRADATION OF RHEOLOGICAL AND TRIBOLOGICAL PROPERTIES OF HYDRAULIC FLUIDS IN FORCED MODES
Authors

PUZANOV Andrey V., Ph. D. in Eng., Assoc. Prof., Leading Researcher, JSC “VNII “Signal”, Kovrov, Russian Federation, 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.

KURDUBANOV Sergey A., Chef Designer — Deputy Director General for Research, JSC “VNII “Signal”, Kovrov, Russian Federation, 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 MECHANICAL ENGINEERING COMPONENTS
Year 2023
Issue 3(64)
Pages 17–24
Type of article RAR
Index UDK 62-82; 004.94
DOI https://doi.org/10.46864/1995-0470-2023-3-64-17-24
Abstract During operation of the drive, the working fluid is exposed to various physical factors of operational and functional nature. At the same time, fluids lose their properties, degrade. This leads to a decrease in productivity and an increase in wear of the movable parts of the hydraulic drive, a decrease in its service life. When forcing hydraulic drives according to power or speed parameters, the dynamics of these processes grows. The paper analyzes various factors that have a negative impact on the operational parameters of the working fluid of hydraulic drives. Software tools of multidisciplinary analysis of models of basic elements of hydraulic drives are used as research methods. The results of simulation of hydraulic drive operating processes are given. Zones and parameters of working fluid degradation degree dependence on external and internal factors are localized. The simulation results using the experiment data make it possible to assess the positive or negative contribution of certain design and technological solutions and operational modes to improvement of the rheological and tribotechnical characteristics of hydraulic drive fluids.
Keywords hydraulic drive, working fluid degradation, modeling of working processes, multiphysics models
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3_2023_sen

MECHANICS OF MOBILE MACHINES
Krasnevskiy L.G., Poddubko S.N., Belevich A.V.
On specifications for mechatronic control systems for automatic transmissions of battery electric vehicles
5
MECHANICAL ENGINEERING COMPONENTS
Puzanov A.V., Kurdubanov S.A.
Minimization of degradation of rheological and tribological properties of hydraulic fluids in forced modes
17
MECHANICS OF DEFORMED SOLIDS
Yankovskii A.P.
Modeling of thermoelastic-viscoplastic dynamic deformation of flexible cylindrical reinforced shells
25
Tulin D.E.
Study of the stress-strain state of the material at the crack tip, located in the area of the structural concentrator
37
DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Potakhov E.A.
Loads of the telescopic boom from local loads during telescoping
43
MECHANICAL ENGINEERING MATERIALS AND TECHNOLOGIES
Konstantinov V.M., Pletenev I.V., Dashkevich V.G., Sudnikov M.A.
Structural mechanism of performance loss of copper coolers of glass production with thermal diffusion protective layer
51
MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Senyut V.T., Vityaz P.A., Parnitsky A.M.
Thermodynamic analysis of the formation of a nanostructural polycrystalline material based on nanodiamonds modified with non-diamond carbon (part 1)
60
Grigoriev F.A., Podgornaya V.V., Marchanka L.N., Kavaliova I.N.
Optimization of concentration of antioxidant additive in plastic lubricant based on rapeseed oil
66
GEOMECHANICS
Zhuravkov M.A., Nikolaitchik M.A., Zhang S.
Mechanical and mathematical models of one type of block elements for problems of underground geomechanics
73
OUR JUBILEES
Krasnevskiy Leonid Grigorevich (on the occasion of his 85th birthday)
83
Skoybeda Anatoliy Tikhonovich (on the occasion of his 85th birthday)
86
Shimanovsky Alexandr Olegovich (on the occasion of his 60th birthday)
89
TO THE MEMORY OF SCIENTIST
Moskvitin Viktor Vasilevich (on the occasion of centenary of the birth)
91