Materials physics and mechanics

RAR RUS 1-6 0000-0001-8286-3472 Ioffe Institute Bagraev N.T.

St.Petersburg, Russia

Ioffe Institute Dovator N.A.

St. Petersburg, Russia

0000-0001-7577-1262 Ioffe Institute Klyachkin L.E.

St.Petersburg, Russia

Silicon nanomagnetism The paper studied the dependence of the magnitude of the magnetic field induced in the contour formed by the edge channels of the silicon nanosandwich structure on the magnitude of the external magnetic field used for pre-magnetization. The measurements were carried out using a fluxgate magnetometer inside a magnetic screen, which ensures the value of the variation in the magnetic field induction no more than 0.1 nT. The experimental results obtained are in good agreement with preliminary estimates that take into account the energy of negative-U dipoles, and thus confirm the defining role of the spin–orbit interaction in quantum transport in the edge channels of the silicon nanosandwich structure. The presence of nanomagnetism in the contour of the edge channels of nanosandwich structures based on the classical semiconductor silicon, which were created using planar technology methods widely used to create processors and various integrated circuits, is demonstrated for the first time. 10.18149/MPM.5172023_1 silicon nanosandwich; edge channel; magnetic flux quantum; negative-U centers; nanomagnetism https://mpm.spbstu.ru/article/2023.99.1/ 1-L_E_-Klyachkin%2C-N_T_-Bagraev%2C-N_A_-Dovator.pdf

RAR RUS 7-14 Peter the Great St. Petersburg Polytechnic University Krivosheev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Shneerson

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Magazinov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zhukov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Voloshin

St. Petersburg, Russia

Destruction threshold of ZrO2 under microsecond magnetic-pulse action The paper describes the magnetic pulse method for the formation of controlled pressure pulses in a microsecond range of duration for testing the dynamic mechanical strength of brittle materials. The scheme of the experimental setup includes a pulse current generator (PCG), the magnetic pulse loading system, the pulse current measuring system and the sample. The main parameters of the developed experimental setup are given - charging voltage, capacitance, inductance, active resistance of the PCG. Zirconium dioxide samples were tested according to this method. Numerical simulation of pulsed magnetic and dynamic mechanical fields during testing of materials is performed. Experimental pulses of the generated pressure are calculated. Based on the results of experiments and numerical modeling, the dynamic mechanical strength of zirconium dioxide under loading mode I was determined based on the described method. 10.18149/MPM.5172023_2 pulsed magnetic fields; magnetic pulse loading; high strain rate deformation; testing of materials https://mpm.spbstu.ru/article/2023.99.2/ 2-S_I_-Krivosheev%2C-et-al.pdf

RAR RUS 15-21 Nakhon Phanom University Samran

Nakhon Phanom, Thailand

Trinity International School Timah

Bangkok, Thailand

Nakhon Phanom University Thongpanit

Nakhon Phanom, Thailand

Rajamangala University of Technology Isan Sakonnakhon Campus Chaiwichian

Sakonnakhon, Thailand

Synthesis and characterization of iron-doped TiO2 nanotubes for dye-sensitized solar cells Titanium dioxide nanotubes as materials for energy conversion were successfully synthesized, characterized and tested for dye-sensitized solar cells (DSSC). The TiO2 nanotubes were grown by one face anodization at room temperature on titanium sheets of 0.25 mm thickness and 99.7 % purity. The electrolyte was composed of ethylene glycol, ammonium fluoride (0.3 wt. % NH4F), deionized water (2 vol. % deionized water) and Fe(NO3)3 as dopant source with varying concentrations of 2, 4, 6 and 10 mM. The X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and ultraviolet–visible spectrometry (UV-vis) techniques were used to characterize the TiO2nanotubes. Finally, the samples were tested in dye-sensitized solar cells and their conversion efficiencies were calculated. According to the results, amorphous TiO2 was transformed into the crystalline anatase phase after heat treatment. Under the given experimental conditions, our optimal results were obtained for the titanium dioxide nanotubes (TNTs) at 6 mM of iron (III) nitrate. The maximum DSSC conversion efficiency was 4.66 % for the TNTs of 6 mM Fe(NO3)3. The findings of this research provide significant guidelines for current and future research in the development of renewable energy. 10.18149/MPM.5172023_3 renewable energy; dye-sensitized solar cells; TiO2 nanotubes; iron (III) nitrate https://mpm.spbstu.ru/article/2023.99.3/ 3-Chaiwichian-et

RAR RUS 22-33 0000-0002-3895-0728 ITMO University Khramov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krasnitckii S.A.

St.Petersburg, Russia

ITMO University Smirnov A.M.

St.Petersburg, Russia

0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

A kinetic model of the stress-induced void evolution in pentagonal whiskers and rods A kinetic model of stress-induced vacancy diffusion in pentagonal whiskers and rods is suggested to investigate the void evolution there. In the framework of the model, the Gibbs-Thompson boundary conditions are employed to identify the free surface effect on the vacancy flux while the elastic fields of the wedge disclination are involved to reveal the contribution of the bulk effect. It is shown that the void evolution mode in the hollow pentagonal whiskers and rods is strongly determined by the initial internal and external radii as well as the materials parameters describing the response of both the residual stress and the surface tension. The void evolution diagram and kinetic curves are demonstrated to elucidate the critical and optimal parameters of this phenomenon. 10.18149/MPM.5172023_4 pentagonal whiskers; pentagonal rods; multiply twinned particles; residual stress; stress relaxation; disclination; hollow nanostructures; stress-induced diffusion https://mpm.spbstu.ru/article/2023.99.4/ 4-A_S_-Khramov%2C-S_A_-Krasnitckii%2C-A_M_-Smirnov%2C-M_Yu_-Gutkin.pdf

RAR RUS 34-41 113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

JSC "I.I. Polzunov Scientific and Development Association on Research and Design of Power Equipment" Shevchuk

St. Petersburg, Russia

Toughening of nanocrystalline alloys due to grain boundary segregations: finite element modeling We propose a two-dimensional (2D) model that describes toughening of nanocrystalline metallic alloys due to grain boundary (GB) segregations. Within the model, brittle GB segregations lead to the formation of satellite GB cracks near the tip of the main crack. These cracks affect the stress concentration in the vicinity of the main crack tip and lead to toughening. We performed 2D finite element simulations of crack growth in a representative volume that incorporates GB fragments without segregations and with segregations. In these simulations, GBs are modeled as interface elements, and the effect of GB segregations manifests itself in a strong reduction of the cohesive strength of these elements. We demonstrate that GB segregations in nanocrystalline alloys can increase the fracture energy and thereby toughen these solids. 10.18149/MPM.5172023_5 nanocrystalline alloys; grain boundaries; segregations; toughening https://mpm.spbstu.ru/article/2023.99.5/ 5-Sheinerman-AG%2C-Shevchuk-RE.pdf

RAR RUS 42-62 Peter the Great St. Petersburg Polytechnic University Borovkov A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Maslov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zhmaylo

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Tarasenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nezhinskaya

St. Petersburg, Russia

Elastic properties of additively produced metamaterials based on lattice structures The paper considers seven types of lattice structures of different topologies, which are periodic unit cells of metamaterials to be manufactured by additive technologies. We carried out finite-element analysis of lattice structures with varying thicknesses of elementary beams comprising the cells and varying initial symmetric shapes. The effective elastic properties of metamaterials as continuous media were calculated by the method of direct numerical homogenization with periodic boundary conditions. The dependences between elastic properties and characteristic parameters determining the topology of cells were established. Some types of lattices were found to exhibit auxetic properties in a certain range of topological parameters. 10.18149/MPM.5172023_6 metamaterials; lattice structures; elastic moduli; finite element analysis; homogenization https://mpm.spbstu.ru/article/2023.99.6/ 6-A_I_-Borovkov%2C-L_B_-Maslov%2C-M_A_-Zhmaylo%2C-F_D_-Tarasenko%2C-L_S_-Nezhinskaya.pdf

RAR RUS 63-98 National Polytechnic School of Oran - MA Afane

Oran, Algeria

University of Djilali Bounaama-Khamis Meliana Zahaf

Théniet El had, Algeria

University of Sciences and Technology of Oran Dahmane

Oran, Algeria

Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

University of Oran 2 Mohamed Ben Ahmed Noureddine

Oran, Algeria

Modal and harmonic analysis of the rotor system involving four different materials by finite element code: Ansys workbench This article presents the study of the Jeffcott rotor shaft system, diameter 32 mm, length 1000 mm with a disc in the middle of an exterior diameter 250 and 30 mm thickness for four different materials namely (JIS-S45C steels, 38CrMoAl steels, structural steels, titanium steels (Ti-6AL-4V)), for a case simply supported, and it is important to determine the natural frequencies, critical speeds and amplitudes of the rotor system (von Mises stress, principal stress, maximum shear stress, lifetime). This characteristic is found by using the parametric design tool ANSYS Workbench. Modal, harmonic cases are realized for the single-rotor system. The results obtained for this analysis are useful for design of rotor system and to facilitate engineering applications and allied researches by presenting a detailed comparative picture based on dynamic analysis of Jeffcott rotor. The authors covered modal, harmonic response along with natural frequencies and whirling speeds at different modes. Resonance occurrence speeds are also analyzed using the Campbell diagram. The harmonic response is investigated, with added material (0.1 kg) on the disc, to reveal the von Mises stress, normal elastic strain, total displacement, maximum shear stress and life cycle number. FEA is carried out to estimate critical speeds for these four materials. The results of this study indicated that the critical speeds are superiors for 38CrMoAl steel, (1858.7, 1859.4, 8468.1 rpm) and lower for the steels of JIS-S45C (1784.2, 1784.9, 8147.7 rpm) by contribution the two steels (structural steels, titanium alloy (Ti-6Al-4V)). The natural frequencies of the Jeffcott rotor are also higher for 38CrMoAl steels and are equal for the two materials (Titanium alloy (Ti-6Al-4V), JIS-S45C) and minimum for structural steels. On the other hand, the results of the harmonic analysis indicated that the vibration severity is very lower for 38CrMoAl steels material (9435.2 MPa) and very higher for structural steels material (55134 MPa). The rotary machines undergoing high stress severity and deformation severity are recommended to use 38CrMoAl steels. Rotor dynamic analysis of Jeffcott rotor with four materials, JIS-S45C, 38CrMoAl, structural steel, titanium alloy materials are highly recommended with the less severity of vibration. Choose JIS-S45C and 38CrMoAl materials for higher whirling speeds compared to structural steel, titanium alloy materials. The rotary machines undergoing higher operating speeds like propeller shafts, turbine and compressor are recommended to use JIS S45C and 38CrMoAl. 10.18149/MPM.5172023_7 rotor; natural frequency; critical speeds; amplitudes; phase angle; damping; Von Mises stress; strain elastic; total displacement https://mpm.spbstu.ru/article/2023.99.7/ 7-Nasreddine-Afane-El-bachir.pdf

RAR RUS 99-106 Marri Laxman Reddy Institute of Technology and Management Venkataramana

Hyderabad, India

Marri Laxman Reddy Institute of Technology and Management Jani

Hyderabad, India

Marri Laxman Reddy Institute of Technology and Management Sudhakar

Hyderabad, India

Kalasalingam Academy of Research and Education Adam Khan

Tamil Nadu, India

Marri Laxman Reddy Institute of Technology and Management Sravanthi

Hyderabad, India

Evaluation of mechanical properties of ABS-based fiber composite with infill using 3D printing technology This research explores the utilization of acrylonitrile butadiene styrene (ABS) material for structural applications, addressing the growing demand for polymer composites. Employing fused filament fabrication (FFF) 3D printing with a 2 mm shell thickness, ABS samples were reinforced with basalt, hemp, and glass fibers using epoxy resin to enhance material strength. Mechanical behavior under axial, flexural, and impact loading conditions was investigated, revealing the basalt-reinforced ABS composite's superior performance with a maximum load of 9540 N - three times that of pure ABS (2975 N). The load-bearing capacity of basalt-epoxy reinforced ABS reached 880 N, surpassing glass-epoxy and hemp-epoxy variants. Impact energy was notably higher for reinforced composites (28.9-32.2 KJ/m2) compared to pure ABS (10.3 KJ/m2). The SEM analysis also carried out for better understanding of fracture surface of composites. This study recommends the application of these reinforced ABS composites in structural contexts. 10.18149/MPM.5172023_8 3D printing; fibre; epoxy; mechanical load https://mpm.spbstu.ru/article/2023.99.8/ 8-Venkataramana%2C-et-al.pdf

RAR RUS 107-116 MKSSS's Cummins College of Engineering for Women Munde

Maharashtra, India

MKSSS's Cummins College of Engineering for Women Shinde

Maharashtra, India

Siva I. Vishwakarma Institute of Information Technology Anearo

Maharashtra, India

Assessment of physical and vibration damping characteristics of sisal/PLA biodegradable composite Natural fiber composites have industrially attractive because of their low density, low cost, and comparable specific mechanical properties with synthetic fiber. The extrusion and injection molding method is used to fabricate the sisal fiber-reinforced PLA biodegradable composites with random fiber orientations. The fiber weight fraction varied from 0 to 30 wt. % (in the step of 10 %), and the influence of the fiber weight fraction of biocomposite on different properties was studied. The composites are tested for evaluating the physical properties, viz. density, hardness, and water absorption and vibration characteristics, viz. natural frequency and damping ratio. The density of Sisal/PLA biocomposites was seen from 1.18 to 1.23 gm/cm3 and hardness from 93.84 to 97.28. In water absorption, as the weight percentage of sisal increases, the diffusion and permeability coefficient increase and reach 2.83E-05 and 8.11E-06, respectively, for 30 % sisal loading. The fundamental natural frequencies and damping ratio of 30 wt. % sisal fiber biocomposite are 24.41 Hz and 0.1450, respectively, higher than the pure PLA. This is observed for all vibration modes, and the reason behind this is the high stiffness of fibers. These developed biodegradable composites help lower the cost of purePLA-based composites and have wise applications in packaging and allied industries. 10.18149/MPM.5172023_9 natural frequency; damping ratio; sisal fiber; PLA; water absorption https://mpm.spbstu.ru/article/2023.99.9/ 9-S_-Munde%2C-A_S_-Shinde%2C-Siva.pdf

RAR RUS 117-123 Institute of Mechanics and Engineering, Kazan Science Center, Russian Academy of Sciences Giniyatullin

Kazan, Russia

Institute of Mechanics and Engineering, Kazan Science Center, Russian Academy of Sciences Yakupov

Kazan, Russia

Institute for Problems of Mechanical Engineering RAS Kuznetsov

St. Petersburg, Russia

Stiffness characteristics of implanted steel plates after exposure to corrosion Ensuring the safety of structures from corrosion damage is an important task. One of the promising directions for increasing corrosion resistance is modifying the surface layer of a structural element using the ion implantation method. The standard approach of uniaxial tension for assessing the mechanical properties of thin-walled elements with corrosion defects is also ineffective, and the gravimetric method does not take into account changes in the structure of the material and physical and mechanical characteristics caused by loosening the material to a certain depth. In this work, on the basis of the experimental-theoretical method, the integral mechanical characteristics of the samples after exposure to corrosion were determined. The effectiveness of protecting steel samples from corrosion by pre-treatment of the surface layer with ion implantation has been demonstrated. The results of an experimental study of corrosive wear of a thin-walled sheet steel plate, on the surface layer of which carbon ions were implanted, are presented. 10.18149/MPM.5172023_10 ion implantation; surface layer; experimental-theoretical method; corrosion wear; reduced modulus of elasticity; tensile rigidity https://mpm.spbstu.ru/article/2023.99.10/ 10-R_R_-Giniyatullin%2C-et-al.pdf

RAR RUS 124-136 Kazan National Research Technological University Vodopyanova

Kazan, Russia

Kazan National Research Technological University Mingazova

Kazan, Russia

Kazan National Research Technological University Fomina

Kazan, Russia

Kazan National Research Technological University Sayfullin

Kazan, Russia

Physical and mechanical properties of modified chrome coatings When solving the problems of improving the metal-surface treatment and giving special and anticorrosive properties to such surfaces, electrochemical composite coatings (ECCs) are essential. It is the dispersed phase that, being included in the metal matrix, gives the composite coatings a complex of new properties. This paper discusses how the aluminum/chromium oxide nanoparticles and high-dispersity graphite affect the physical and mechanical properties of coatings with a chrome matrix, i.e., corrosion resistance in 5 % NaCl, hardness, and wear resistance. Using the X-ray diffraction analysis, we have assessed how the particles under study affect the distribution of chromium over the surface of a steel sample. This paper also presents the microhardness test results for the heat treatment modes (temperature and time) of modified chrome coatings. 10.18149/MPM.5172023_11 electrochemical composite coatings; chrome matrix; the aluminum/chromium oxide nanoparticles; high-dispersion carbon; corrosion resistance; hardness; wear resistance; heat treatment https://mpm.spbstu.ru/article/2023.99.11/ 11-Vodopyanova%2C-et-al.pdf

RAR RUS 137-142 National University of Oil and Gas “Gubkin University” Malyshev

Moscow, Russia

National University of Oil and Gas “Gubkin University” Gelfgat

Moscow, Russia

National University of Oil and Gas “Gubkin University” Shcherbakov

Moscow, Russia

Peter the Great St. Peresburg Polytechnic University Alkhimenko

St.Petersburg, Russia

Increasing of the resistance against contact corrosion of LAIDP with steel tool joints This paper discusses the possibility of protection enhancing against contact corrosion of light-alloy drill pipes (LAIDP) by forming a ceramic coating on threaded parts of the aluminum drill pipe using the micro-arc oxidation (MAO) method. When such a coating is formed in the zone of connection of the pipe with steel tool joint and on the threaded part of the pipe, a barrier for contact corrosion between the steel tool joint and the surface of the aluminum pipe is created. Studies of this paper were directed to determine the electrochemical potentials (ECP) on samples in a pair of aluminum alloy 1953T1 and steel 40KhN2MA in a 5 % NaCl solution at 20 °C and their influence on the contact corrosion. The results obtained showed that protective MAO-coating reduce the contact corrosion of the pipe and increase the reliability of connection between the LAIDP pipe body and the steel tool joint. 10.18149/MPM.5172023_12 contact corrosion; light-alloy drill pipes; micro-arc oxidation method https://mpm.spbstu.ru/article/2023.99.12/ 12-Malyshev%2C-et-al.pdf

RAR RUS 143-147 Saint-Petersburg University of State Fire Service of Emercom of Russia Samigullin

St. Petersburg, Russia

Saint-Petersburg University of State Fire Service of Emercom of Russia Nefedyev

St. Petersburg, Russia

Gazprom PJSC Samigullina

St. Petersburg, Russia

Saint-Petersburg University of State Fire Service of Emercom of Russia Bruslinovskiy

Saint Petersburg, Russia

Assessment of industrial safety at oil refining facilities based on stochastic modeling The article deals with the estimation of negative influence (impact), provided by dangerous factors, appearing during fire hazardous situation. It is clear, that both thermal stream and inner overpressure mutually can lead to the machine depressurization and destruction, which can cause cascading troubles, making situation more hurtful, than it was. The application of mathematic model is suggested in order to estimate the probability of equipment backstop integrity, which guarantees the evaluation of prevention possibility of the Domino effect. 10.18149/MPM.5172023_13 process equipment; emergency situation; normal distribution; standard deviation; expected value; cascade accident progression https://mpm.spbstu.ru/article/2023.99.13/ 13-Samigullin-et-al-.pdf