Materials physics and mechanics

RAR RUS 1-8 7006355365 0000-0002-6663-6357 Kuban State University Babeshko Vladimir

Krasnodar, Russia

57201387701 Southern Scientific Center RAS Evdokimova Olga

Rostov-on-Don, Russia

6602333282 0000-0003-1283-3870 Kuban State University Babeshko Olga

Krasnodar, Russia

On the exact solution of mixed problems for multicomponent multilayer materials For the first time, an accurate analytical solution of mixed or contact problems for multicomponent multilayer materials has been constructed. It is assumed that the contact problem is formulated at the boundary of a multilayer multicomponent material in a semi-infinite region. These can be contact problems for a multilayer medium that simultaneously includes thermoelectroelastic, magnetoelastic, piezoelastic, water-saturated, nanomaterials and other layers described by linear partial differential equations. In the contact area, there can be any conditions of mechanical, physical or chemical properties that lead the boundary problem to a system of arbitrary finite number of Wiener-Hopf integral equations with a meromorphic matrix in the core. The article uses a new universal modeling method that allowed factorizing the operator of an infinite system of linear algebraic equations. 10.18149/MPM.5152023_1 multicomponent materials mixed contact problems system of Wiener-Hopf integral equations Galerkin transformation factorization https://mpm.spbstu.ru/article/2023.97.1/ 1-Babeshko_Evdokimova.pdf

RAR RUS 9-15 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Polzunov Altai State Technical University Bebikhov Yuriy V.

Barnaul, Russia

Polzunov Altai State Technical University Semenov Alexander S.

Barnaul, Russia

Polytechnic Institute of North-Eastern Federal University Sitnikov

Mirny, Russia

Polytechnic Institute of North-Eastern Federal University Yakovlev V.I.

Mirny, Russia

Molecular dynamics study of the dissolution of titanium nanoparticles in aluminum The dissolution of a titanium particle in aluminum under the conditions of the crystalline and amorphous state of aluminum and titanium was studied by the molecular dynamics method. It is shown that the state of the aluminum structure has little effect on the intensity of titanium dissolution. This is due to the formation around a crystalline titanium particle, regardless of the initial aluminum structure, of a crystalline layer of aluminum with a thickness of about 1 nm, which repeats the titanium lattice. This layer affects the mechanism and intensity of mutual diffusion near the Ti–Al interface. In the case of the amorphous state of the titanium particle and the aluminum matrix, the dissolution occurred several times faster than in the crystalline state of titanium. That is, the reduction in the ignition temperature of the reaction of high-temperature synthesis in the Ti–Al system is much more efficiently achieved not by amorphization of aluminum, but by amorphization of titanium. 10.18149/MPM.5152023_2 molecular dynamics; diffusion; interphase boundary; titanium aluminum https://mpm.spbstu.ru/article/2023.97.2/ 2-Poletaev%2C-et-al.pdf

RAR RUS 16-23 Mechanical Engineering Research Institute, Russian Academy of Science Sarafanov

Nizhni Novgorod, Russia

Kozma Minin Nizhny Novgorod State Pedagogical University Shondin

Nizhny Novgorod, Russia

Plasma Science and Fusion Center, Massachusetts Institute of Technology Kuznetsov

Cambridge, MA, USA

A model of the formation of serrated deformation and propagation of Luders bands during the Portevin-Le Chatelier effect in alloys A distributed autowave model of the Portevin-Le Chatelier effect has been developed for the region of medium and elevated temperatures in alloys. The model was converted into dimensionless form and the mechanisms of serrated deformation and localization of plastic flow were studied using analytical and numerical approaches. An instability region is found for the rate of plastic deformation and temperature, in the vicinity of which the Portevin-Le Chatelier effect is realized. The critical dimensionless parameters responsible for the variety of spatial-wave solutions of the initial system of equations are determined: the shapes of the load oscillations representing a quasi-periodic sequence of oscillating wave packets; bursts of plastic deformation velocity. The bursts are strictly correlated and form distinct Portevin-Le Chatelier bands under the stochastic deformation regime. Portevin-Le Chatelier bands extend from one end of the crystal to the other, where the reverse band is formed. This process of propagation of deformation bands is periodically repeated. 10.18149/MPM.5152023_3 Portevin-Le Chatelier effect; alloys; serrated deformation; high temperatures; stochastic self – oscillation; Luders and Portevin-Le Chatelier bands https://mpm.spbstu.ru/article/2023.97.3/ 3-G_F_-Sarafanov%2C-et-al.pdf

RAR RUS 24-37 Peter the Great St. Petersburg Polytechnic University Savikovskii

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Semenov Artem

St.Petersburg, Russia

Influence of material anisotropy on the interaction between cracks under tension and shear The fracture of anisotropic bodies with multiple macrocraks is analyzed by means of modeling interaction between cracks and interaction of crack with the free boundary. The influence of material anisotropy on cracks behavior is investigated for orthotropic material, material with cubic symmetry and isotropic material. Article deals with numerical computations of stress intensity factors of internal and edge cracks in the rectangular plate under uniaxial tension and pure shear loadings. The displacement extrapolation method is used for the computation of stress intensity factors for anisotropic materials. The effect of material anisotropy on stress intensity factors for different crack configurations (one, two and three cracks of different lengths) under various loading conditions (tension or shear) is investigated and discussed. 10.18149/MPM.5152023_4 linear elastic fracture mechanics; anisotropic material; stress intensity factor; finite-element modeling; displacement extrapolation method; Lekhnitskii formalism crack https://mpm.spbstu.ru/article/2023.97.4/ 4-A_V_-Savikovskii%2C-A_-S_-Semenov.pdf

RAR RUS 38-51 Ural State Mining University Zaytsev

Yekaterinburg, Russia

Federal Institute for Materials Research and Testing (BAM) Funk

Berlin, Germany

On the crack evolutional in human dentin under uniaxial compression imaged by high resolution tomography An observation of the fracture process in front of the crack tip inside a dentin sample by means of ex-situ X-ray computed tomography after uniaxial compression at different deformation values was carried out in this work. This ex-situ approach allowed the microstructure and fracturing process of human dentin to be observed during loading. No cracks are observed up to the middle part of the irreversible deformation in the samples at least visible at 0.4µm resolution. First cracks appeared before the mechanical stress reached the compression strength. The growth of the cracks is realized by connecting the main cracks with satellite cracks that lie ahead of the main crack tip and parallel its trajectory. When under the stress load the deformation in the sample exceeds the deformation at the compression strength of dentin, an appearance of micro-cracks in front of the main cracks is observed. The micro-cracks are inclined (~60°) to the trajectory of the main cracks. The further growth of the main cracks is not realized due to the junction with the micro-cracks; we assume that the micro-cracks dissipate the energy of the main crack and suppressed its growth. These micro-cracks serve as additional stress accommodations, therefore the samples do not break apart after the compression test, as it is usually observed under bending and tension tests. 10.18149/MPM.5152023_5 dentin; crack evolution; compression strength; mechanical properties; microstructure; ex-situ X-ray computed tomography https://mpm.spbstu.ru/article/2023.97.5/ 5-D_-Zaytsev-%2C-A_-Funk.pdf

RAR RUS 52-65 Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Science Novikova

Moscow, Russia

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Science Trimonova

Moscow, Russia

Moscow Institute of Physics and Technology Dubinya

Dolgoprudny, Russia

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Science Turuntaev

Moscow, Russia

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Science Zenchenko

Moscow, Russia

Estimation of breakdown pressure in laboratory experiments on hydraulic fracturing Hydraulic fracturing is one of the most common methods used to study stress-strain state of hydrocarbon reservoir being developed. The process of fracture initiation and propagation is affected by initial stress state in the rock and tensile strength of the rock. Moreover, fracturing fluid filtered through the walls of the well into the well surrounding rock mass also affects the process of fracture propagation. The purpose of this work is to determine the best method for assessing the fracture breakdown pressure according to laboratory experiments. The experiments on hydraulic fracturing were carried out on a special laboratory setup that allows to create loading conditions on a model sample that are close to real conditions at a real field being developed. Some of the known methods based on analysis of the dependencies of borehole pressure on time were used for laboratory data processing. 10.18149/MPM.5152023_6 hydraulic fracturing; stress-strain state; breakdown pressure; backstress effect; laboratory experiments; data processing https://mpm.spbstu.ru/article/2023.97.6/ 6-Novikova%2C-et-al-.pdf

RAR RUS 66-78 Vyatka State University Fomin

Kirov, Russia

Vyatka State University Rostovtsev

Kirov, Russia

Vyatka State University Meltsov

Kirov, Russia

0000-0001-5735-3489 VPO "Vyatka State University" Shirokova

Kirov, Russia

Prediction of mechanical properties of elastomeric materials using neural networks The article is devoted to the use of neural networks for predicting the mechanical properties of rubber. Rubbers include, as a rule, more than one and a half dozen components. Each of the components has a complex and ambiguous effect on the complex of material properties. When developing new compositions, this significantly complicates and lengthens the solution of material science problems by traditional methods of composition selection. These problems can be effectively solved using machine learning techniques. The authors have developed approaches to the use of neural networks for predicting the mechanical properties of rubber from a known composition. In this article, neural network models have been created and optimized, which make it possible to predict the mechanical properties of elastomeric materials with high accuracy. 10.18149/MPM.5152023_7 elastomers; rubbers; physical and mechanical properties; convolutional neural network; hyperparameter optimization; neural network technologies; python language; keras library https://mpm.spbstu.ru/article/2023.97.7/ 7-S_V_-Fomin%2C-et-al.pdf

RAR RUS 79-89 Ufa University of Science and Technology Medvedev A.Yu.

Ufa, Russia

Ufa University of Science and Technology Medvedev Andrey E.

Ufa, Russia

Ufa University of Science and Technology Shaikhulova Aygul F.

Ufa, Russia

Ufa University of Science and Technology Nikiforov

Ufa, Russia

Ufa University of Science and Technology Murugova

Ufa, Russia

Ufa University of Science and Technology Galimov

Ufa, Russia

The numerical simulation of the post-welding stress-strain state of thin-sheets welded joints of EP718 alloy The paper presents the development of a numerical thermal deformation model of two-pass pulsed arc GMA (Gas Metal Arc) welding of a thin-sheet welded joint made of EP718 alloy using the ANSYS package, considering the distribution of temperature fields from a consumable electrode during transverse vibrations. Experimental verification of the calculation results showed that the developed thermal deformation model of two-pass GMA welding makes it possible to predict the stress-strain state of a thin-sheet welded joint with an error of 10 %, sufficient for engineering calculations. Residual stresses von Mises after welding according in the weld does not exceed 840 MPa (0.8 σB). The thermal deformation model of two-pass GMA pulsed arc welding developed during research can be used to assess the stress-strain state of a welded structure of complex spatial geometry with a large number of welds. 10.18149/MPM.5152023_8 deformation simulation during welding; heat-resistant alloy; EP718; thermal cycles during welding; ATOS deformation measurement https://mpm.spbstu.ru/article/2023.97.8/ 8-A_Yu_-Medvedev_et-al.pdf

RAR RUS 90-98 Glocal University Bhati

Saharanpur, India

Charan Singh (P.G.) College Yadav

Etawah, India

B.S.A. College Gupta

Mathura, India

Uttaranchal University Verma

Uttarakhand, India

Simplistic model for the investigation of mechanical stability parameters of pyrochlore structured solids Herein, we present a simplistic theoretical model for the calculation of bulk modulus, shear modulus and Young’s modulus. These parameters indicates that investigated materials show stability or instability in nature. A stable material may be used in many applications like thermoelectric, photovoltaic, etc. In this paper, we have found all the materials have good stability. We have proposed a simple relation with plasmon oscillation theory. The calculated values are in better agreement with their experimental and reported values, and even for many pyrochlore compounds, these are revealed for the first time, and have great potential for technological applications of thermal barrier coatings (TBC) in aerospace, construction, nuclear reactors, and supercritical boiler industries. 10.18149/MPM.5152023_9 bulk modulus; shear modulus; Young’s modulus; rare earth pyrochlores https://mpm.spbstu.ru/article/2023.97.9/ 9-R_-Bhati%2C-et-al.pdf

RAR RUS 99-106 Siddaganga Institute of Technology Gopal Krishna

Karnataka, India

Siddaganga Institute of Technology Vasudeva

Karnataka, India

0000-0001-6549-6340 Siddaganga Institute of Technology Tumkur Auradi

Tumkur, India

0000-0002-8248-7603 Aircraft Research and Design Centre, Hindustan Aeronautics Limited Nagaral Madeva

Bangalore, India

Effect of cobalt and tungsten carbide particles inclusions into the aluminium composite on the hardness and wear properties Using liquid metallurgy route, Al7075 composites comprising 6, 9, and 12 wt. % WC-Co were developed. When testing composites and Al7075, ASTM standards were followed. Increasing the vol. % of the cermet phase enhances the hardness of Al7075-WC-Co composites, according to the experimental data. The produced composites are analyzed using scanning electron microscopic images and energy dispersive microscopy technique before and after the wear. Improvement of 80.23 % on hardness of the composite are observed over the base alloy. For the composite containing 12 wt. % of WC-Co particulates the wear rate is less than the base alloy and other prepared composites. 10.18149/MPM.5152023_10 aluminium tungsten carbide; MMC; hardness; wear https://mpm.spbstu.ru/article/2023.97.10/ 10-U_B_-Gopal-Krishna%2C-et-al.pdf

RAR RUS 107-114 Trakya University Guder

Edirne, Turkey

Effect of Al addition on the mechanical properties of Zr50Cu50-xAlx (0≤x≤50) bulk metallic glass The evolution of microstructural and mechanical properties of ternary Zr-Cu-Al metallic glass under tensile loading was investigated by molecular dynamics simulations using embedded atomic potentials to describe interactions between atoms in the system. Special attention was paid to the variation of these properties according to the Al content in the Zr50Cu50-xAlx (0≤x≤50) system. The results showed that there is no systematic relationship between the elastic properties and the amount of Al, but the local structure of the system is significantly affected during the tensile load. The elastic modulus and yield stress were found to be maximum at 40 and 20 %, respectively. It was also revealed that the addition of Al decreased the fraction of Al-centered polyhedra, and increased the fraction of the same polyhedra around Cu and Zr. 10.18149/MPM.5152023_11 molecular dynamics simulations; elastic modulus; voronoi polyhedral; mechanical properties; ZrCuAl metallic glass https://mpm.spbstu.ru/article/2023.97.11/ 11-V_-Guder.pdf

RAR RUS 115-125 0000-0002-7276-7716 University of Djillali Merzoug Mohammed

Sidi Bel Abbes, Algeria

University of Mustapha Ghazi

Mascara, Algeria

University of Djillali Liabes Lousdad

Sidi Bel Abbes, Algeria

University of Djillali Liabes Benamara

Sidi Bel Abbes, Algeria

University of Djillali Liabes Miloudi A.

Sidi Bel Abbes, Algeria

University of Djillali Liabes Boulenouar

Sidi Bel Abbes, Algeria

Effect of the parameters affecting the properties during friction stir welding of AA 5083 H111 alloy This research topic focuses on the friction stir welding (FSW) process. The study focuses on the correlation between the process parameters (feed speed and rotational speed) and the mechanical and microstructural characteristics of the 5083 H111 aluminum alloy sheets 4 mm thick placed end-to-end and welded by a vertical milling machine from. This experimental approach is based on the variation of the depth of penetration of the shoulder of the tool, allowing to contribute to mastering the axial force in order to predict the welding process area for this grade of aluminum by the welding process FSW. Then, tensile and hardness test were done to investigate the mechanical properties of the weld. The optimum process parameters were determined with reference to grain size, ultimate tensile strength and hardness. In addition, microhardness profiles allow to give the importance of the influence of the studied parameters on the different zones of the weld. 10.18149/MPM.5152023_12 FSW aluminum alloys penetration pin and fracture surface https://mpm.spbstu.ru/article/2023.97.12/ 12-M_-Merzoug%2C-et-al.pdf

RAR RUS 126-141 National Research Mordovia State University Rodin

Saransk, Republic of Mordovia, Russia

National Research Mordovia State University Ermakov

Saransk, Republic of Mordovia, Russia

National Research Mordovia State University Erofeeva

Saransk, Republic of Mordovia, Russia

0000-0001-8407-8144 Ogarev Mordovia State University Erofeev

Saransk, The Republic of Mordovia, Russia

Structure and properties of porous glass ceramics from siliceous rocks with the addition of Mg(OH)2 Porous glass-ceramic materials are widely used in the construction, reconstruction and repair of objects for various purposes. The article establishes the influence of Mg(OH)2 and together with Al2O3 in the composition of a charge of siliceous rocks and soda ash on the structure and properties of porous glass-ceramic materials. A joint mechanochemical activation of the components was carried out in a planetary ball mill, and then the resulting charge was fired at a maximum temperature of 825 °C. The influence of the type and quantity of additives on the structure and properties of porous glass ceramics was established by thermal analysis (TA), X-ray phase analysis (XRD), etc. From the charge with the addition of Mg(OH)2 in glass ceramics, instead of wollastonite, diopside is formed, and instead of devitrite, combeite is formed. The influence of the phase composition of the samples on their properties has been established. The developed porous glass ceramics has an apparent density of 135-235 kg/m3, bending and compressive strength up to 1.6 and 4.2 MPa, respectively, a thermal conductivity coefficient of 0.05-0.067 W/m∙°C, thermal resistance of 170 °C, maximum operating temperature up to 870 °C, high chemical resistance. The developed materials are superior in many respects to foam glass and other analogues and can be used in the insulation of industrial and civil facilities. 10.18149/MPM.5152023_13 glass ceramic; construction material; thermal insulation; siliceous rocks; Mg(OH)2; compressive strength; thermal conductivity https://mpm.spbstu.ru/article/2023.97.13/ 13-A_I_-Rodin%2C-et-al.pdf

RAR RUS 142-151 ITMO University Prasolov Nikita

St. Petersburg, Russia

Ioffe Institute Kulagina

Saint Petersburg, Russia

Ioffe Institute Guseva

St. Petersburg, Russia

Ioffe Institute Zadiranov

St. Petersburg, Russia

Alferov University Nikitina

Saint Petersburg, Russia

Connector Optics LLC Andryushkin

St. Petersburg, Russia

Submicron Heterostructures for Microelectronics Research and Engineering Center, Russian Academy of Sciences (RAS) Vasil’ev

Saint Petersburg, Russia

JSC OKB-Planeta Voropaev

Veliky Novgorod, Russia

Ioffe Institute Ustinov V.M.

St.Petersburg, Russia

Ioffe Institute Blokhin

St.Petersburg, Russia

Ioffe Institute Levin

St. Petersburg, Russia

Ioffe Institute Epoletov

Saint Petersburg, Russia

Ioffe Institute Kuzmenkov

St. Petersburg, Russia

Ioffe Institute Blokhin

St.Petersburg, Russia

Ioffe Institute Bobrov

St. Petersburg, Russia

Ioffe Institute Kovach

Saint Petersburg, Russia

Ioffe Institute Maleev

Saint Petersburg, Russia

Surface morphology of InGaAs and InP layers after local Zn diffusion from the vapor phase in the MOCVD reactor The influence of technological parameters during the local Zn diffusion from the metalorganic source DEZn in the MOCVD reactor on the surface morphology of the InGaAs and InP layers was investigated. For a long-term process (more than 120 minutes) of local Zn diffusion into InP through the InGaAs surface layer, erosion of InGaAs surface was observed regardless of the material of the dielectric mask (SiO2, SiNx), the method of deposition of the dielectric mask (plasma chemical deposition or chemical vapor deposition) and method of etching of the dielectric mask (plasma chemical etching or liquid chemical etching). The effect of lateral Zn diffusion under the dielectric mask was formed on InGaAs/InP heterostructures has been studied. It was found that the depth of Zn diffusion in lateral direction into InGaAs is several times less than the depth of lateral Zn diffusion into InP layer. At the same time, a decrease in the thickness of the InGaAs surface layer leads to an increase in the depth of lateral diffusion of Zn under the mask due to the mechanism of vertical Zn diffusion from the InP:Zn region into the InGaAs surface layer. 10.18149/MPM.5152023_14 zinc diffusion; surface morphology; diethylzinc; indium phosphide; indium gallium arsenide https://mpm.spbstu.ru/article/2023.97.14/ 14-S_A_-Blokhin%2C-et-al.pdf

RAR RUS 152-164 Nosov Magnitogorsk State Technical University Gulin

Magnitogorsk, Russia

Nosov Magnitogorsk state technical university Korchunov

Magnitogorsk, Russia

Nosov Magnitogorsk State Technical University Konstantinov

Magnitogorsk, Russia

Nosov Magnitogorsk State Technical University Sheksheev

Magnitogorsk, Russia

Nosov Magnitogorsk State Technical University Polyakova

Magnitogorsk, Russia

Features of the properties of steel with the trip effect under various types of deformation loading Metastable steels, in particular, with the TRIP effect, have advantages over other steels due to the combination of strength and plasticity because of the peculiarities of their microstructure. The article presents the results of a study of the mechanical properties of aluminum-modified TRIP steel. Samples were obtained in the laboratory by traditional method of metallurgical manufacturing. The mechanical properties were investigated by tensile, compression testing methods, as well as by instrumental indentation (Berkovich method). During the tensile tests, the tensile curves of samples with different deformation rates and the values of the proof yield strength under compression were obtained, an experimental hardening curve of TRIP steel modified with aluminum was constructed. The Berkovich method obtained an array of data "load — depth of indentation", which is used to determine the hardness on the Martens scale, indentation hardness, modulus of elasticity, creep during the indentation, as well as the proportion of elastic component work during the instrumental indentation. The results obtained are of great practical importance in the development of technologies for the production of structural products from TRIP steel modified with aluminum. 10.18149/MPM.5152023_15 metastable steel; TRIP steel; mechanical properties; hardening curve; additive manufacturing https://mpm.spbstu.ru/article/2023.97.15/ 15-A_E_-Gulin_et-al.pdf