Materials physics and mechanics

RAR RUS 301-307 Tomsk State University Yakovlev N.N.

Tomsk, Russia

Tomsk State University Almaev

Tomsk, Russia

Ioffe Institute Butenko

St.Petersburg, Russia

Lobachevsky State University Mikhaylov A.N.

Nizhny Novgorod, Russia

Ioffe Institute Pechnikov

St.Petersburg, Russia

Ioffe Institute Stepanov

St.Petersburg, Russia

Ioffe Institute Timashov

St.Petersburg, Russia

Ioffe Institute Chikiryaka

St.Petersburg, Russia

Ioffe Institute Nikolaev

St.Petersburg, Russia

Effect of Si+ ion irradiation of α-Ga2O3 epitaxial layers on their hydrogen sensitivity The effect of Si+ ion irradiation of α-Ga2O3 at doses of 8·1012 cm-2, 8·1014 cm-2, and energy of 100 keV on the gas-sensitive properties has been studied. It is shown that irradiation of α-Ga2O3 layer grown by halide vapor phase epitaxy with implanted Si+ ions allows effective control of its sensitivity to H2, response, and recovery times, as well as varying the operating temperatures. The maximum sensitivity to H2 occurred for samples with Si+ ion irradiation dose of 8·1012 cm-2 at 400ºC. The mechanism of sensitivity of α-Ga2O3 epitaxial layers irradiated with Si+ to H2 is discussed. 10.18149/MPM.4832022_1 α-Ga2O3 halide vapor phase epitaxy ion implantation gas sensitivity https://mpm.spbstu.ru/article/2022.88.1/ 1-N_N_-Yakovlev%2C-A_V_-Almaev%2C-P_N_-Butenko-et-al.pdf

RAR RUS 308-314 Ioffe Institute Mynbaev

St.Petersburg, Russia

Ioffe Institute Sovtus

St.Petersburg, Russia

Non-equilibrium phonon gas in a chalcogenide semiconductor with exponential temperature dependence of conductivity The distribution function for a phonon gas in the non-equilibrium case of current crowding in a chalcogenide glassy semiconductor is considered. The approximate internal energy of the gas and its heat capacity is calculated. The change in the heat capacity caused by phase changes, which according to the results of the numerical calculations, are similar to the second-order phase transition, is analyzed. The law of temperature variation with time is calculated for a homogeneous current crowding without a heat sink, taking into account the exponential dependence of the conductivity on the temperature. It is shown that the temperature dependences of the concentration and energy of phonons do not undergo significant changes and are linear. The results of this work should be useful in developing chalcogenide glass-based phase-change memory devices, where strong heating by an electric current is possible and, as a consequence, a significant effect of phonons on the current flowshould occur. 10.18149/MPM.4832022_2 chalcogenide glasses current filament phonon gas https://mpm.spbstu.ru/article/2022.88.2/ 2-K_D_-Mynbaev%2C-N_V_-Sovtus.pdf

RAR RUS 315-327 Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Bharti

India

Optimization of powder metallurgy process parameters to enhance the mechanical properties of AZ91 magnesium alloy In the present work, optimization of powder metallurgy process parameters, i.e., compaction pressure, sintering time, and sintering temperature, for magnesium alloy AZ91 is done using Taguchi Design of Experiment and ANOVA techniques. Regression equation for determining ultimate compressive stress and hardness of AZ91 Magnesium alloy was formulated and validated experimentally. Out of the nine sets of parameters present in the current design, H8 (450 MPa compaction pressure, 450° sintering temperature, and 60 minutes sintering time) was found to be the best set of parameters for both the hardness and ultimate compressive stress. Still, the optimum set of parameters was not present in the current design of experiments. The optimum set of parameters obtained after analyzing the main effect plots for means is a combination of 450 MPa compaction pressure, 450° sintering temperature, and 90 minutes of sintering time. The optimum value of hardness and ultimate compressive stress obtained from the regression equations is 81.81 Hv and 138.90 MPa, respectively. Experimental value of ultimate compressive stress and hardness for samples processed at optimal parameters is 144.89 MPa and 82.12. Compression test results obtained from regression analysis are 4.31% less than the experimental results. Micro-hardness results obtained from regression analysis are 0.4% less than the experimental results. This shows that the regression analysis results are in good agreement with experimental results. 10.18149/MPM.4832022_3 ANOVA AZ91 magnesium alloy powder metallurgy Taguchi https://mpm.spbstu.ru/article/2022.88.3/ 3-Naveen-Kumar%2C-Ajaya-Bharti.pdf

RAR RUS 328-341 Kalasalingam University Vignesh

Tamilnadu, India

Cape Institute of Technology Winowlin Jappes J.T.

Levengipuram, India

S.T. Hindu College Nagaveena

Tamilnadu, India

Kalasalingam Academy of Research and Education Sankaranarayanan

Tamilnadu, India

S.T. Hindu College Krishna Sharma

Tamilnadu, India

Kalasalingam Academy of Research and Education Brintha

Tamilnadu, India

A study on mechanical and dielectric properties of B4C and Al dispersed single-layered epoxy-based polymer composites fabricated through molding and curing route The work aims in developing epoxy composites with different compositions of boron carbide (5, 10, 15, and 20 wt.%) added with aluminium (10 wt %) for studying the mechanical and dielectric behavior. It was found that the tensile strength of the samples initially increased with an increase in reinforcements and then decreased with an increase in B4C content beyond 10 wt. %. Flexural strength, on the other hand, increased with the addition of B4C particles. Moreover, the impact strength of the samples decreased with an increase in the addition of the B4C particles. The dielectric properties were studied by considering various factors like temperature and frequency. The samples were subjected to frequencies 100Hz, 1kHz, 10kHz, 100kHz, and 1MHz, and temperatures ranged from 40oC to 150oC. As a result, it was found that the dielectric loss factor was increased with increasing temperature. Further, at higher frequencies, an increase in the dielectric constant and a decrease in the dielectric loss factor were evidenced which concluded the material's suitability for energy storage applications. 10.18149/MPM.4832022_4 conducting polymers dielectric properties mechanical properties molding particle dispersed https://mpm.spbstu.ru/article/2022.88.4/ 4-S_-Vignesh%2C-J_T_-Winowlin-Jappes-et-al.pdf

RAR RUS 342-354 Perm National Research Polytechnic University Shipunov

Perm, Russia

Perm National Research Polytechnic University Baranov

Perm, Russia

Perm National Research Polytechnic University Nikiforov

Perm, Russia

Perm National Research Polytechnic University Khabibrakhmanova

Perm, Russia

Comparison of mechanical strain measurement accuracy of fiber-optic sensor and smart-layer Due to its fragility, fiber optic sensor (FOS) embedded into constructions made of carbon fiber reinforced polymer, can be broken both while it is manufacturing at the point of embedding into construction, and during its operation. This can lead to the inability to further monitoring of the construction strains. Usage of a specific thin Smart-layer for protection of FOS is proposed by the authors. For the Smart-layer manufacturing, 3D printing technology was used. The spectra of fiber Bragg grating (FBG) before and after layer printing have been analyzed, remaining compression strains were recorded. A mechanical test of a sample with surface-mounted FOS along with a Smart-layer was performed in order to measure the precision of strain detection by the Smart-layer. Some inaccuracy in strain detection was found during the analysis of the results. In order to find out the error in strain measured by a Smart-layer, a mechanical test of a full-sized bulkhead in a complex stress-strain state was performed. 10.18149/MPM.4832022_5 fiber optic sensor structural health monitoring fused deposition method Smart- layer carbon fiber reinforced polymer https://mpm.spbstu.ru/article/2022.88.5/ 5-G_S_-Shipunov%2C-M_A_-Baranov-et-al.pdf

RAR RUS 355-366 Peter the Great St. Petersburg Polytechnic University Shneerson

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Khlybov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Belov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nenashev

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Parfentiev

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Shimanskiy

St. Petersburg, Russia

Deformation and mechanical stresses in a magnet with thin-walled quasi-force-free winding The factors leading to an increase in the mechanical stress in the winding of solenoids are considered on the example of a thin-walled magnet with a multi-turn quasi-force-free winding. This example is compared with an ideal system in the form of a solenoid with unlimited length and continuous current distribution. A method for measuring submicron-sized dynamic deformations of the winding in a pulsed field has been developed and verified by comparing experiment results and calculations. Numerical modelling allowed us to distinguish the influence of local edge effects determined by characteristics of the field distribution in the inter-turn gaps. Numerical calculations have shown how the mechanical properties of the material surrounding the coil affect the stress in the winding. The possibility of reducing the stress by increasing Young's modulus of the material was confirmed. The Influence on the strength of axial forces that arise near the edges of the turns and lead to compression of the turns in the axial direction is revealed. 10.18149/MPM.4832022_6 quasi-force-free magnetic fields mechanical stresses local effects influence of Young's modulus on strength https://mpm.spbstu.ru/article/2022.88.6/ 6-G_A_-Shneerson%2C-A_V_-Khlybov%2C-A_A_-Belov-et-al.pdf

RAR RUS 367-378 Ecole Nationale Polytechnique d'Oran Maurice AUDIN Habieb

Oran, Algeria

Ecole Nationale Polytechnique d'Oran Maurice AUDIN Hamdadou

Oran, Algeria

Preparation and characterization of undoped and antimony doped tin oxide thin films synthesized by spray pyrolysis Undoped and antimony doped tin oxide thin films (SnO2 :Sb) have been deposited by the spray pyrolysis method on glass substrates heated at 350°C, with various doping concentrations 0 (undoped), 1 at.%, 3 at.%, and 5 at.%. The influence of annealing temperature and various Sb doping rates on the structural, morphological and optical properties have been investigated, using grazing incidence X-ray diffraction (GIXRD), profilometry, atomic force microscopy (AFM), UV-Visible spectrophotometry and photoluminescence measurements (PL). GIXRD diagrams show that the films deposited atvarious Sb concentrations are polycrystalline with a tetragonal rutile type structure and preferred orientation direction along [110]. It has been also noted that the grain size changes between 11 nm and 25 nm. Atomic force microscopy (AFM) visualization revealed that surface morphology was found to be influenced by the incorporation of Sb and average roughness was varied between 4.580 nm and 10.793 nm. The optical characterization shows that the maximum value of transmittance of 82 % was found for SnO2: 1 at.% Sb thin films were annealed at 400°C for 4 hours and the optical band gap values range from 3.668 eV to 4.224 eV of SnO2 films. Room-temperature photoluminescence measurements under excitation at 325 nm show broad emission peak, Photoluminescence (PL) properties influenced by antimony doping for the SnO2 films are investigated. 10.18149/MPM.4832022_7 Transparent Conducting Oxide (TCO) Antimony Doped Tin Oxide Thin Films Spray Pyrolysis Annealing Temperature Grazing Incidence X-ray Diffraction (GIXRD) Profilometer Atomic Force Microscopy (AFM) Photoluminescence (PL) https://mpm.spbstu.ru/article/2022.88.7/ 7-H_-Habbieb%2C-N_-Hamdadou.pdf

RAR RUS 379-385 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 problem of evaluating the behavior of multicomponent materials in mixed boundary conditions in contact problems For the purposes of evaluating the behavior of multicomponent materials under operating conditions, the paper for the first time constructs in general an exact solution of systems of Wiener-Hopf integral equations of arbitrary order. Systems of these equations arise in mixed problems of continuum mechanics for multicomponent materials of complex rheology. The cases of mixed boundary value problems are considered under the assumption that there is a change of boundary conditions on the inner or outer boundary of a multilayer medium. Such mixed problems are reduced to systems of Wiener-Hopf integral equations, the Fourier transform of the kernels of which is a fairly general meromorphic matrix-a function that does not coincide with any of the special cases for which the system of equations is precisely solved. Earlier, the authors considered the case of a system consisting of two equations. The transfer of these results to the case of an arbitrary number of equations is based on this previously performed work. Systems of Wiener-Hopf integral equations arise in the mechanics of deformable media, geophysics, flaw detection, economics, and in a number of related fields. 10.18149/MPM.4832022_8 multicomponent materials systems of Wiener-Hopf integral equation meromorphic matrix- function in the core exact solution https://mpm.spbstu.ru/article/2022.88.8/ 8-V_A_-Babeshko%2C-O_V_-Evdokimova%2C-O_M_-Babeshko.pdf

RAR RUS 386-396 Grozny State Oil Technical University Syzrantsev

Grozny, Russia

Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences Arymbaeva

Novosibirsk, Russia

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences Zavjalov

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences Zobov

Novosibirsk, Russia

The nanofluids' viscosity prediction through particle-media interaction layer This work aims to draw a more fundamental understanding of the rheology of nanofluids and the interpretation of the discrepancy in the literature. The rheology of dispersions based on SiO2 and Al2O3 nanoparticles obtained by four different methods is experimentally investigated in the Newtonian range. It is shown that the viscosity dependence on concentration for nanofluids with particles of different synthesis methods has different values. The parameter of the associated liquid layer model describing the intensity of particles and dispersed medium interaction, as well as the ζ-potential of these liquids, were determined. The correlation between the ζ-potential and the thickness of the associated liquid layer is shown, and the possibility of their use for predicting the behavior of nanofluids is discussed. 10.18149/MPM.4832022_9 nanofluids viscosity colloid particles particles distribution particle-liquid interaction https://mpm.spbstu.ru/article/2022.88.9/ 9-V_V_-Syzrantsev%2C-A_T_-Arymbaeva%2C-A_P_-Zavjalov%2C-K_V_-Zobov.pdf

RAR RUS 397-406 Sepuluh Nopember Institute of Technology Misbah

Surabaya, Indonesia

Sepuluh Nopember Institute of Technology Ariesta

Surabaya, Indonesia

Sepuluh Nopember Institute of Technology Yulianto

Surabaya, Indonesia

Sepuluh Nopember Institute of Technology Setyawan

Surabaya, Indonesia

Sepuluh Nopember Institute of Technology Putra

Surabaya, Indonesia

Study numerical and experimental of stress concentration factor on isotropic plate with hole The stress concentration factor (SCF) can lead to the failure of ship construction. That problem can occur with hotspot stress expansion in the local area because of the acting load and structural details shapes. However, there is no method for the asses of structure design failure in the minor openings such as a dry hole and scallop dimension. Furthermore, the research aims for evaluating stress concentration performed using the diameter and width (d/W) ratio. The model of plates generates to identify stress phenomena on the isotropic ship plate. The numerical simulation was carried out using finite element analysis and proven by experimental method with the installation of the strain measurement on several working loads of 30% and 60% under yield strength. The plate used for analysis is an A36 steel plate commonly used in the shipbuilding industry. The plate model with the hole was identified, which shows the stress concentration that occurs increases after the d/W of the isotropic plate also increases, then the comparative stress plot. Moreover, based on the numerical and experimental analysis, the comparisons of stress concentration factors within different radius holes have been completed for assessment. Finally, result from numerical and experimental obtained error values below 3%. 10.18149/MPM.4832022_10 stress concentration factor ship numerical experimental https://mpm.spbstu.ru/article/2022.88.10/ 10-M_N_-Misbah%2C-R_C_-Ariesta%2C-T_-Yulianto-et-al.pdf

RAR RUS 407-418 Hanoi University of Science and Technology Chu Manh Hoang

Hanoi, Viet Nam

FPT University Nguyen Van Duong

Hanoi, Viet Nam

FPT University Dang Van Hieu

Hanoi, Viet Nam

An out-of-plane oscillating beam nanoresonator with ultrahigh intrinsic quality factor An out-of-plane oscillating beam nanoresonator with the ultrahigh intrinsic quality factor based on the motion transformation mechanism from torsion into rotation is reported. The nanoresonator is composed of two resonant beams which are mechanically coupled through two spring beams oscillating in an out-of-phase torsional mode. The out-of-phase torsional oscillation of the two spring beams forms a stationary point in the middle of a supporting beam, which minimizes anchor loss. The low thermoelastic damping (TED) in the nanoresonator is obtained by employing the torsional oscillation mode. The optimal study for minimizing TED has been carried out by varying the representative geometry parameters of the nanoresonator. The nanoresonator with a quality factor over 107 has been obtained by the proposed oscillation excitation method. 10.18149/MPM.4832022_11 beam nanoresonator out-of-plane oscillation torsional oscillation thermoelastic damping https://mpm.spbstu.ru/article/2022.88.11/ 11-Chu-Manh-Hoang%2C-Nguyen-Van-Duong%2C-Dang-Van-Hieu.pdf

RAR RUS 419-427 Institute of Radiation Problems of Azerbaijan National Academy of Sciences Mehrabova

Baku, Azerbaijan

Azerbaijan University of Architecture and Construction Panahov

Baku, Azerbaijan

Baku State University Hasanov

Baku, Azerbaijan

Ab initio calculations of electronic band structure of ideal and defective CdMnS The purpose of this work was to calculate the electronic band structure of ideal and defective Cd1-xMnxS. Ab initio, calculations are performed in the Atomistix Toolkit program within the Density Functional Theory and Local Spin Density Approximation on Double Zeta Double Polarized basis. We have used Hubbard U potential UMn = 3.59 eV for 3d states for Mn atoms. Supercells of 8 and 64 atoms were constructed. After the construction of Cd1-xMnxS (x = 6.25%; 25%) supercells, atom relaxation and optimization of the crystal structure were carried out. Electronic band structure, and density of states were calculated, and total energy have been defined in antiferromagnetic and ferromagnetic phases. Our calculations show that the band gap increases with the increases in Mn ion concentration. It has been established that defects such as interstitial Cd(S) atom, Cd(S) vacancy or Frankel pair in the crystal structure lead to increasing band gap, shifting of Fermi level towards the valence or conduction band. 10.18149/MPM.4832022_12 ab initio calculations DFT semimagnetic semiconductors electronic band structure defect https://mpm.spbstu.ru/article/2022.88.12/ 12-Matanat-A_-Mehrabova%2C-Natig-T_-Panahov%2C-Niyazi-H_-Hasanov.pdf

RAR RUS 428-442 Indian Institute of Technology Roorkee Kamran

Roorkee, India

Aligarh Muslim University Ahmad

Aligarh, India

Aligarh Muslim University Khan

Aligarh, India

Seismic behavior of heritage building with isotropic and orthotropic material properties: a comparative analysis Restoration and retrofitting of heritage buildings is a complex analysis. In actual practice, building materials of heritage masonry buildings are anisotropic. However, in practice, these building materials had been considered isotropic to optimize the analysis. The present study is a comparative analysis of these two approaches. A heritage school building in northern India underlying seismic zone IV has been considered for the analysis. The seismic performance analysis of the buildings has been carried out through numerical modeling using the SAP2000. Analysis has been carried out for one set of isotropic and three sets of orthotropic material parameters. Normal and shear stresses had been observed and compared with stress calculated from the empirical relationships provided in the standard code of practice. 10.18149/MPM.4832022_13 heritage building orthotropic material seismic performance Chamoli earthquake modal analysis https://mpm.spbstu.ru/article/2022.88.13/ 13-Kamran%2C-Shakeel-Ahmad%2C-Rehan-A_-Khan.pdf

RAR RUS 443-451 Institute of Strength Physics and Materials Science SB RAS Nikonov

Tomsk, Russia

Institute of Strength Physics and Materials Science SB RAS Bibko

Tomsk, Russia

Institute of Strength Physics and Materials Science SB RAS Lychagin

Tomsk, Russia

Calculation of the stress level in modeling the inter-dislocation interaction of aluminum bronze The behavior of a polycrystal during deformation depends on the deformation of its constituent grains, their boundaries, and the degree of interaction. In this case, the deformation of a single grain is determined by its orientation and morphology. An urgent task is to estimate the stress level for individual grains of a polycrystalline aggregate of aluminum bronze. This problem can be solved by molecular dynamics simulation of crystallites with different crystallographic and geometric characteristics. Based on the results of the active plastic deformation simulation, the main types of dislocations are identified and their role in plastic deformation and hardening is determined. It has been established that the orientation of the lateral faces under moderate deformations has little effect on the fraction of dislocations of various types and the stress. A noticeable effect is exerted by the compression axis crystallographic orientation and the sample height. 10.18149/MPM.4832022_14 aluminum bronze molecular dynamics method deformation stress dislocation interaction https://mpm.spbstu.ru/article/2022.88.14/ 14-A_Yu_-Nikonov%2C-A_A_-Bibko%2C-D_V_-Lychagin.pdf

RAR RUS 452-458 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Altai State University Rakitin

Barnaul, Russia

Influence of Ni-Al interphase boundary orientation on the interdiffusion rate at temperatures above aluminum melting point: a molecular dynamics study The influence of the orientation of Ni-Al interphase boundary relative to the nickel crystal lattice on the intensity of interdiffusion at temperatures above the melting temperature of aluminum was studied by the method of molecular dynamics. It was observed that the boundary between the crystalline and liquid phases was, in fact, shifted by two or three atomic planes into the aluminum phase – a thin layer of aluminum near the boundary retained a crystalline structure that repeated the nickel lattice. As the temperature increased, the thickness of the Al crystalline layer near the boundary decreased. The concentration curves were obtained after modeling interdiffusion at various temperatures for (111) and (001) orientations of the interphase boundary with respect to the Ni lattice. The parts of the curves responsible for the diffusion of Al atoms into crystalline Ni turned out to be similar for both orientations. However, the more sloping parts related to the diffusion of Ni atoms into liquid Al differed: diffusion of Ni atoms into Al proceeded more intensively at the (111) boundary orientation and slower at orientation (001). 10.18149/MPM.4832022_15 molecular dynamics diffusion interphase boundary nickel aluminum https://mpm.spbstu.ru/article/2022.88.15/ 15-G_M_-Poletaev%2C-R_Y_-Rakitin.pdf