1_2023_sen_13

Title of the article SHRINKAGE AND CREEP OF CONCRETE IMPACT ON THE INTERACTION ELEMENTS OF “LINING — SALT ROCK MASS” SYSTEM
Authors

KAZLOUSKI Jauheni Ja., Ph. D. Student of the Theoretical and Applied Mechanics Department, 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.

ZHURAVKOV Michael. A., D.Sc. in Phys. and Math., Prof., Head of the Theoretical and Applied Mechanics Department, 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 GEOMECHANICS
Year 2023
Issue 1(62)
Pages 95–100
Type of article RAR
Index UDK 539.3+622.28+624.121
DOI https://doi.org/10.46864/1995-0470-2023-1-62-95-100
Abstract The paper presents a comparison of different approaches to the problem of considering the phenomena of shrinkage and creep of concrete during underground construction in a rock salt mass. The comparison is based on the results of numerical modelling of the stress-strain state of the mine shaft lining. As a result of modelling studies, a significant influence of the method of considering the shrinkage and creep of concrete on the results of calculations has been established, which is especially important given the trends in changing the compositions of modern concrete and the characteristic differences in the formulations of concrete used in underground construction. Based on the results obtained, it is recommended to consider established phenomena with the use of creep functions directly taking into account the features of the formulation and technology.
Keywords geomechanics, underground structures, salt rocks, creep of concrete, mine shaft
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Bibliography
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  6. Protosenja A.G., Katerov A.M. Razvitie napryazhenno-deformirovannogo sostoyaniya kombinirovannoy krepi vertikalnogo stvola, proydennogo v solyanom massive [Development of stress and strain state of combined support for a vertical shaft driven in salt massif]. Mining informational and analytical bulletin, 2022, no. 6-1, pp. 100–113. DOI: 10.25018/0236_1493_2022_61_0_100 (in Russ.).
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1_2023_sen_12

Title of the article BIOMECHANICAL MODELLING OF THE HUMAN SKULL STRESS STATE UNDER IMPACT BY CYLINDRICAL SOLID
Authors

BOSIAKOV Sergei M., D. Sc. in Phys. and Math., Assoc. Prof., Dean of the Faculty of Mechanics and Mathematics, 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.

PRONKEVICH Sergei A., Ph. D. in Phys. and Math., Assoc. Prof., Associate Professor of the Department of Bio- and Nanomechanics, 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.

MOROZ Igor A., Ph. D. in Law, Director, The Scientific and Practical Centre for Problems of Reinforcing Law and Order of the Prosecutor General’s Office 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.

ZALUZHNI Gennadi I., Head of the Scientific Department of Technical, Forensic and Special Research, Scientific and Practical Center of the State Forensic Examination Committee 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.
In the section BIOMECHANICS
Year 2023
Issue 1(62)
Pages 88–94
Type of article RAR
Index UDK 531/534:[57+61]
DOI https://doi.org/10.46864/1995-0470-2023-1-62-88-94
Abstract Skull fractures are quite often observed in victims of falls, traffic accidents, attacks with the use of bats and rods. The aim of the study is to assess the stress-strain state of the human head under impact on the basis of finite element modelling. The impact is applied to the frontal region of the frontal bone by the middle part and the end of a cylindrical solid (a rod). The solid is differently oriented with respect to the in relation to the Frankfurt plane. The head model includes the epidermis (skin), bone structures of the skull, bone structures of the lower jaw, eyeballs, teeth, meninges (dura, arachnoid and pia mater), cerebrum (white and gray matter), cerebellum, brain stem, muscles and ligaments. The elements of the human head model are described by the models of a linearly elastic material, a viscoelastic incompressible material, an elastic-plastic material considering fracture, and a hyper-elastic material. The eyeballs are assumed as absolutely rigid. The finite element analysis was carried out for different values of the initial velocity of a rod, corresponding to the moment of its contact with the skin of the head. It was found out that the maximum equivalent stresses and deformations of the skull bone structures occur under impact by the middle part of the rod compared to impact by its end. The impact action of the rod leads to the maximum equivalent stresses if the rod is located at an angle of 60° to the vertical. The region of the maximum stresses is located at the intersection of the sagittal and coronal sutures, and to a greater extent, significant stresses are observed along the coronal suture. The results obtained can be used by experts in the field of forensic science to evaluate various scenarios for the occurrence of traumatic brain injury and substantiate further forensic investigations.
Keywords impact load, bone structures of the skull, cylindrical impactor, finite element modelling, equivalent stresses
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1_2023_sen_10

Title of the article INFLUENCE OF THE STRUCTURE OF IRON-TITANIUM THERMAL SPRAYED COATINGS ON THEIR WEAR RESISTANCE
Authors

KUKAREKO Vladimir A., D. Sc. in Phys. and Math., Prof., Chief of the Center of Structural Research and Tribomechanical Testing of Materials and Mechanical Engineering Products of Collective Use of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, 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.

BELOTSERKOVSKY Marat А., D. Sc. in Eng., Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, 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.

GRIGORCHIK Alexander N., Ph. D. in Eng., Deputy Head of the Center of Structural Research and Tribomechanical Testing of Materials and Mechanical Engineering Products of Collective Use of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, 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.

SOSNOVSKIY Aleksey V., Ph. D. in Eng., Leading Researcher of the Laboratory of Gas-Thermal Methods of Machine Component Hardening of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, 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 MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2023
Issue 1(62)
Pages 72–78
Type of article RAR
Index UDK 621.793
DOI https://doi.org/10.46864/1995-0470-2023-1-62-72-78
Abstract The paper studies the structure, phase composition and properties of thermal sprayed coatings made of Ti4Al titanium alloy and “Ti4Al + AISI420” pseudoalloy obtained by hypersonic metallization. It is shown that the deposited coatings include in the phase composition a large amount of titanium nitride TiN (up to 70 vol.%), which is formed during the metallization process. At the same time, an increase in propane pressure during metallization from 0.3 to 0.4 MPa leads to a slight decrease in the titanium nitride content in the sprayed coating. It is associated with an increase in the flight velocity of molten titanium droplets in an atmosphere of ionized gases and, accordingly, a decrease in the time of their interaction with ionized air nitrogen atoms. The porosity of the sprayed coatings made of titanium alloy Ti4Al is 30–35 vol.%, and their hardness and microhardness are 500–650 HV 1 and 1,300–1,600 HV 0.1, respectively. Coatings made of “Ti4Al + AISI420” pseudoalloy have a reduced porosity of 10–15 vol.%, and their hardness and microhardness are 500–600 HV 1 and 900–1,300 HV 0.1, respectively. It is shown that coatings made of Ti4Al alloy and “Ti4Al + AISI420” pseudoalloy are characterized by increased wear resistance under friction without lubricant. In particular, the intensity of mass wear of coatings Iq made of Ti4Al titanium alloy, obtained at propane pressures of 0.3 and 0.4 MPa, is 2.5–2.6×10–3 mg/m, and Iq for coatings made of “Ti4Al + AISI420” pseudoalloy is 1.0–1.1×10–3 mg/m. The reduced values of mass wear intensities of coatings made of “Ti4Al + AISI420” pseudoalloy are associated with the presence of TiN in them and relatively low porosity.
Keywords hypersonic metallization, titanium alloy, titanium nitride, porosity, microhardness, wear resistance
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Bibliography
  1. Belotserkovsky M.A., Sosnovskiy A.V., Pryadko A.S., Yalovik A.P., Trusov D.I. Vybor tekhnologicheskikh parametrov protsessa naneseniya stalnykh pokrytiy metodom giperzvukovoy metallizatsii [Selecting the technological parameters of steel coatings formation by hypersonic metallization]. Mechanics of machines, mechanisms and materials, 2015, no. 3(32), pp. 52–57 (in Russ.).
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1_2023_sen_11

Title of the article ASYMPTOTIC APPROACH TO SOLVING THE CONTACT PROBLEM FOR A ROLLING BODY WITH A THIN DEFORMABLE RIM
Authors

CHERNOUS Dmitry A., Ph. D. in Eng., Assoc. Prof., Associate Professor of the Department “Technical Physics and Theoretical Mechanics”, Belarusian State University of Transport, 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.

KADNIANKA Alena V., Engineer for Scientific and Technical Information of the Department of Scientific and Technical Information, JSC “Soligorsk Institute of Resources Saving Problems with Pilot Production”, Soligorsk, 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 2023
Issue 1(62)
Pages 79–87
Type of article RAR
Index UDK 620.178
DOI https://doi.org/10.46864/1995-0470-2023-1-62-79-87
Abstract On the basis of an asymptotic approach to solving the elasticity theory boundary value problem for a thin strip rigidly linked to a non-deformable base, the differential equations are derived for determining the normal and shear loads distributed on the strip face free from fastening. These equations are used to solve the contact problem for a rigid cylinder with a thin elastic rim with a non-deformable horizontal rough support surface. The cylinder loading by a vertical force is considered for a given cylinder center settling. The calculated diagrams of contact pressure and shear contact stresses are obtained. In contrast to the previously used methods, the developed technique makes it possible to take into account the presence of adhesion and slip zones in the contact area, as well as to use a mathematically strict solution of the constitutive equations for contact pressure and shear contact stress. The value of the vertical force acting on the rigid cylinder for a given cylinder center displacement is determined. The stress tensor intensity distribution in the rim is established. The results of the developed technique application are compared with the calculated estimates obtained on the basis of the exact solution of the boundary value problem for a strip of arbitrary thickness and within the method, involving the use of the Winkler base simplified model. The dependences of the results error for the developed method on the thickness and Poisson's ratio of the rim material are obtained. The paper describes the effect of the rim-support surface friction coefficient on the contact pressure, shear contact pressure, and the maximum intensity of the stress tensor in the rim. It is concluded that it is reasonable to use the developed technique at solving contact problems for rolling elements with a relatively thin elastic rim.
Keywords contact problem, thin layer, asymptotic approximation, contact pressure, shear contact pressure, stress tensor intensity
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1_2023_sen_9

Title of the article ENVIRONMENTALLY SAFE LIQUID LUBRICANT FOR THE SAW CHAINS BASED ON THE COMBINED DISPERSION MEDIUM
Authors

ZAPOLSKY Andrey V., Specialist in the Introduction of New Technologies, LLC “Eurasia Lubricants”, Zaslavl, 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.

ZHORNIK Viktor I., D. Sc. in Eng., Prof., Head of the Department of Technologies of Mechanical Engineering and Metallurgy — Head of the Laboratory of Nanostructured and Superhard Materials of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, 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 MECHANICAL ENGINEERING MATERIALS AND TECHNOLOGIES
Year 2023
Issue 1(62)
Pages 63–71
Type of article RAR
Index UDK 669.018.95
DOI https://doi.org/10.46864/1995-0470-2023-1-62-63-71
Abstract The realization of the synergistic effect is shown on the example of creating of the composite liquid lubricant with improved properties using the combined dispersion medium obtained by mixing of the vegetable and mineral oils. The lubricant for the saw chains and the method of its production are developed. The highly purified mineral oil of group III of the NS-4 brand is added to the rapeseed oil in the amount of 20.0…25.0 wt.%, and the complex of the calcium sulfonate with calcium carbonate in the amount of 1.5…2.0 wt.% is used as a multifunctional additive in the manufacture of this lubricant. The developed lubricant has the following characteristics: kinematic viscosity at 40 °C — 61…63 mm2/s; solidification temperature is –29 °C; flash point — 242…246 °C; welding load — 2,764 N; wear index — 0.39…0.41 mm; mass fraction of free organic acids — 1.3...4.7 mg KOH/g; degree of biodegradability — 88–89 %; warranty period of storage in an open container — 12 months.
Keywords liquid lubricant, saw chain, vegetable and mineral oils, combined dispersion medium, physicochemical properties, sedimentation stability, biodegradability
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