Materials physics and mechanics

RAR RUS 1-17 36169811300 0000-0002-0873-0046 Maharishi Markandeshwar University Kaushal

Haryana, India

59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

57223456585 0009-0000-5437-1972 Lovely Professional University Bala

Phagwara, India

58927589200 0009-0008-4347-4851 Lovely Professional University Sharma

Phagwara, India

Impact of non-local, two temperature and impedance parameters on propagation of waves in generalized thermoelastic medium under modified Green-Lindsay model This study is primarily focused on the behavior of propagation of waves through a homogeneous and isotropic thermoelastic half-space using the modified Green-Lindsay theory of thermoelasticity, along with the effects of non-local and two temperature (TT) parameters. A new set of governing equations is formulated and solved using the reflection technique after reducing the equations to two dimensions and a dimensionless form. The impact of different parameters namely non-local parameter, TT parameter, and impedance parameters along with different theories of thermoelasticity are shown graphically on amplitude ratios obtained from reflected waves i.e., longitudinal wave (LD-wave), thermal wave (T-wave), and transverse wave (SV-wave). The modified Green-Lindsay theory is widely used in fields such as heat transfer, and geophysics with potential practical applications in areas such as earthquake engineering and materials engineering. The study also includes the deduction of particular cases based on the obtained results. 10.18149/MPM.5212024_1 modified Green-Lindsay theory non-local two temperature impedance parameters https://mpm.spbstu.ru/article/2024.100.1/ 1-S-Kaushal.pdf

RAR RUS 18-25 7202832034 0000-0002-0787-2210 Kurchatov Institute National Research Centre Belov

Moscow, Russia

Subcritical growth of repolarization nuclei in polycrystalline ferroelectric films The problem of subcritical growth of repolarization nuclei in ferroelectric crystals is considered. Following the approach of Barenblatt to the theory of equilibrium brittle cracks, a concept of cohesive forces, acting on adjacent domain walls in a region near the domain tip, is introduced. These cohesive forces are intimately related to the gradient term in the Ginzburg-Landau energy and become substantial as the separation between the domain walls compares with their thickness δ. The condition of equilibrium for a ferroelectric domain is formulated by taking into account the internal field associated with the cohesive forces. Criteria for stable subcritical growth of nuclei in non-uniform electric fields are presented in terms of a gradient modulus, which is an extension of the cohesion modulus concept of Barenblatt. The article was prepared based on the report presented at the Symposium "Micromechanics of Functional Materials" at the XIII All-Russian Congress on Theoretical and Applied Mechanics. 10.18149/MPM.5212024_2 subcritical growth ferroelectrics ferroelectric domains polycrystalline thin films https://mpm.spbstu.ru/article/2024.100.2/ 2-A_-Yu_-Belov.pdf

RAR RUS 26-38 15623815600 0000-0003-1102-1061 Shirak State University Sargsyan

Armenia

Moment-membrane theory of elastic cylindrical shells as a continual model of deformation of a single-layer carbon nanotube One of the key tasks in the study of two-dimensional nanomaterials (fullerenes, nanotubes, graphene) is to explore their mechanical properties: bending, vibrations, and stability. For the study of such problems, it is essential to construct both microscopic and macroscopic models of the deformation behavior of such materials. Based on the three-dimensional moment theory of elasticity, the moment-membrane theory of elastic cylindrical shells is constructed as a continual model of deformations of a single-layer carbon nanotube. The axisymmetric deformation of an elastic cylindrical shell is studied, and numerical results are presented. Further, a moment-membrane technical theory of elastic cylindrical shells is constructed, on the basis of which the stability of the initially axial compressed state of a carbon nanotube is studied, and the critical load value is numerically determined. The article was prepared based on the report presented at the Symposium "Micromechanics of Functional Materials" at the XIII All-Russian Congress on Theoretical and Applied Mechanics. 10.18149/MPM.5212024_3 carbon nanotube continual model moment-membrane theory of cylindrical shells axisymmetric statics problem stability problem critical load value https://mpm.spbstu.ru/article/2024.100.3/ 3-SH-Sargsyan.pdf

RAR RUS 39-48 0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

7003559440 0000-0003-2192-0386 Institute for Problems of Mechanical Engineering RAS Skiba Nikolai nikolay.skiba@gmail.com

St. Petersburg, Russia

Emission of lattice dislocations from triple junctions of grain boundaries in high-temperature ceramics with amorphous intercrystalline layers A theoretical model of a mechanism of plastic deformation in high-temperature ceramic materials containing amorphous intercrystalline layers (AILs) is suggested. Within the model, the plastic deformation is realized due to the nucleation and the development of inclusions of a liquid-like phase in the AILs and the glide of lattice dislocations emitted from the triple junctions of the AILs that contain the liquid-like phase inclusions. In the exemplary case of high-temperature α-Al2O3 ceramics with AILs, the temperature dependences of the critical stresses for the formation of a liquid-like phase nucleus, for the lattice dislocation emission and for the lattice dislocation glide in a wide range of the deformation temperatures from 300 to 1500 K are calculated. The critical values of the external shear stress and the deformation temperature, at which the glide of the emitted lattice dislocations in the grain interior becomes energetically favorable, are determined. 10.18149/MPM.5212024_4 high-temperature ceramics amorphous intercrystalline layers liquid-like phase inclusions lattice dislocations deformation temperature https://mpm.spbstu.ru/article/2024.100.4/ 4-Gutkin_Skiba.pdf

RAR RUS 49-59 57208741522 0000-0001-8684-7541 Federal State-Financed Educational Institution of Higher Learning "Komsomolsk-na-Amure State University" Feoktistov

Komsomolsk-on-Amur, Russia

57209342766 0000-0001-8732-9615 Federal State-Financed Educational Institution of Higher Learning "Komsomolsk-na-Amure State University" Andrianov

Komsomolsk-on-Amur, Russia

Analytical description of the Bauschinger effect using experimental data and the generalized Мasing principle The research is devoted to the problem of obtaining an analytical expression for the dependence of stresses on strains during unloading and subsequent loading by the reverse sign force, taking into account the Bauschinger effect. The assessment of the deformed state was carried out using the use of Hencky strains. The mathematical model was developed under the assumption of a cyclically ideal material. To process the experimental data, the generalized Masing principle was applied, which is used to describe the ideal Bauschinger effect. On the basis of experimental data for the 45HGMA material, curves of changes in the coefficients of the Bauschinger effect were obtained using the least squares method. The results obtained showed sufficient convergence with experimental data. The results of the study can be used in solving elastic-plastic problems for various processes of alternating loading using the deformation theory of plasticity, when a description of the deformation diagram of the material is required, using the analytical dependence of stresses on strains according to the hypothesis of a single curve. 10.18149/MPM.5212024_5 Bauschinger effect generalized Masing principle deformation diagram alternating loading stress logarithmic strain https://mpm.spbstu.ru/article/2024.100.5/ 5-SI-Feoktistov%2C-IK-Andrianov.pdf

RAR RUS 60-68 ITMO University Petrenko

St. Petersburg, Russia

ITMO University Solovyov

St. Petersburg, Russia

0000-0001-5919-7125 ITMO University Antonov

St. Petersburg, Russia

0000-0002-4457-1820 ITMO University Dorogin

St. Petersburg, Russia

University of Padova Murugesan

Padua, Italy

Green's function molecular dynamics method for contact mechanics with a viscoelastic layer Advanced technological and engineering solutions involve usage of complex tribological systems. There is a demand for precise and computationally efficient methods to describe such systems. The aim of this study is to develop a computationally efficient method to solve the problem of deformation of a two-layer system using the Green's function molecular dynamics (GFMD) technique. We consider a viscoelastic layer attached to an elastic halfspace and derive a constitutive equation in Fourier space from the corresponding elastic solution. This third-order equation is numerically integrated by the backward Euler method, and a quasi-static solution is found through the fast inertial relaxation engine (FIRE) optimization algorithm. The method is illustrated with a simple model of indentation by a rigid cylinder. Using this method, contact area and pressure were calculated as a function of time for various shear modulus values. 10.18149/MPM.5212024_6 boundary element method viscoelasticity contact mechanics computational method contact area https://mpm.spbstu.ru/article/2024.100.6/ 6-Petrenko.pdf

RAR RUS 69-80 57927817900 0000-0001-8695-3598 St. Petersburg State University Almazova

St. Petersburg, Russia

56405547100 0000-0001-9097-8501 St. Petersburg State University Sedova

St. Petersburg, Russia

Numerical estimation of fatigue life of aluminum alloy specimen with surface defects based on stress-life approach This paper presents a numerical study for fatigue life estimation of a cylindrical specimen made of aluminum alloy under high cycle fatigue regime. The fatigue life is assessed through the stress-life approach. The sample is weakened by either a cluster of surface defects or by an equivalent defect. Two different forms of defects are considered. The load conditions are assumed to be uniaxial tension-compression with a load ratio R = 0.1. To account for non-zero mean stress the Goodman correction is used. The material properties are considered to be combined nonlinear isotropic and kinematic hardening implemented in ANSYS Workbench software. 10.18149/MPM.5212024_7 aluminum alloy finite element analysis FEM stress-strain state corrosion pit fatigue life surface defect interaction of defects cyclic loads https://mpm.spbstu.ru/article/2024.100.7/ 7-LA-Almazova%2C-OS-Sedova.pdf

RAR RUS 81-94 Ufa State Aviation Technical University Murashkin Maxim Yu.

Ufa, Russia

57117996000 0000-0001-6116-1535 Ufa University of Science and Technology Zainullina

Ufa, Russia

57200791697 0009-0007-1272-3993 Siberian Federal University Motkov

Krasnoyarsk, Russia

Ufa State Aviation Technical University Medvedev

Ufa, Russia

57192191063 0009-0004-0288-1814 Siberian Federal University Timofeev

Krasnoyarsk, Russia

Ufa State Aviation Technical University Enikeev

Ufa, Russia

Microstructure, mechanical properties and heat resistance of AL30 piston alloy produced via electromagnetic casting The paper explores the microstructure, mechanical properties and heat resistance of the piston alloy AL30 (AK12MMgN) for the first time produced via continuous casting into an electromagnetic mold (electromagnetic casting, EMC). The study demonstrates that casting into EMC allows for the formation of a homogeneous dispersed microstructure in both the peripheral and central zones of the ingot, consisting of a blend of aluminum's solid solution and eutectic, which contains lamellar silicon (Si). The volume fraction of compact primary Si particles does not exceed 1 %. In addition to Si, the aluminum matrix contains the phases of crystallization origin such as e-Al3Ni, p-Al8FeMg3Si6, Q-Al4Cu2MgSi7 and S-Al2CuMg. The analysis of the evolution of microstructure and properties of a cast alloy after conventional heat treatment (HT) reveals that microstructural changes induced by HT lead to the AL30 alloy having mechanical properties that far exceed the properties of its counterparts obtained through traditional casting methods. The research analysis shows that mechanical properties and heat resistance of the AL30 alloy produced via EMC with subsequent T6 treatment are comparable to the deformable piston alloys such as the AK12D alloy after similar heat treatment. 10.18149/MPM.5212024_8 piston aluminum alloy electromagnetic casting heat treatment microstructure phase composition mechanical properties heat resistance https://mpm.spbstu.ru/article/2024.100.8/ 8-Murashkin.pdf

RAR RUS 95-107 Ufa State Aviation Technical University Medvedev

Ufa, Russia

LLC Attestation Center Svarka Tech Service Atroshchenko

Ufa, Russia

LLC Attestation Center Svarka Tech Service Selivanov

Ufa, Russia

Ufa University of Science and Technology Bogdanov

Ufa, Russia

LLC Krus-Zapad Gorbatkov

Ufa, Russia

LLC Attestation Center Svarka Tech Service Logachev

Ufa, Russia

LLC Attestation Center Svarka Tech Service Lobachev

Ufa, Russia

Influence of various friction stir processing (FSP) schemes on the microstructure and properties of AD31 aluminium alloy busbar This paper examines the influence of various schemes for implementing friction stir processing (FSP) on the microstructure and properties of a conductive busbar made of AD31T (AA6063) aluminum alloy. In particular, the implementation of five different FSP schemes on the formation of structure and volumetric defects in the volume of the stir zone was studied. It has been shown that performing FSP at a tool rotation speed of 1120 rpm and a linear tool movement velocity of 200 mm/min ensures the absence of macroscopic defects in the volume of the stir zone. The implementation of certain FSP schemes made it possible to achieve the formation of an ultrafine-grained structure both in the near-surface layer and in the bulk of the material under study. This type of processing can be recommended as a way to increase the strength of aluminum materials without significant loss of their electrical conductivity. 10.18149/MPM.5212024_9 friction stir processing FSP Al-Mg-Si AA6063 aluminium alloy fine-grained structure microhardness electrical conductivity https://mpm.spbstu.ru/article/2024.100.9/ 9-Medvedev-AE%2C-et-al.pdf

RAR RUS 108-117 57209346964 0000-0001-9432-3836 R. L. Jalappa Institute of Technology Gowrishankar

Karnataka, India

57204841088 0000-0003-3701-3107 Jawaharlal Nehru University Sangmesh

New Delhi, India

Role of heat treatment on mechanical and wear characteristics of Al-TiC composites The aim of this work is to explore the mechanical and wear properties of Al-TiC composites synthesized through liquid metallurgy technique. Al6061 was the matrix material used and Titanium carbide (TiC) is the reinforcement material. The composites were fabricated by adding TiC of 3, 6, 9 and 12 wt. % to Al6061. Thermal processing was used on the produced composite specimens to accomplish solutionization at 530 °C for a period of 8 hours and quenched in three different medias like air, water and ice. The effect of heat treatment and quenching media was evaluated in the research. In order to validate the effect of heat treatment as cast samples also studies for its wear properties. Results outcomes shows the better mechanical and wear characteristics compare to composites that haven't been heat treated. Also, superior mechanical and wear characteristics of composites are produced by ice quenching compare to air and water quenching. Wear out samples are investigated through SEM to study the mechanism of wear. Microstructure study was made, and it reveals good bond between matrix and reinforcement material. 10.18149/MPM.5212024_10 Al6061 TiC liquid metallurgy SEM wear hardness mechanical properties https://mpm.spbstu.ru/article/2024.100.10/ 10-T_P_-Gowrishankar.pdf

RAR RUS 118-125 Peter the Great St. Petersburg Polytechnic University Arutyunyan A.R.

St.Petersburg, Russia

Influence of aging on fatigue strength of carbon fiber reinforced plastics Various composite materials are implemented in aircraft, rocket and automobile construction, shipbuilding, railway transport, tidal power and others due to their high strength to weight ratio, superior fatigue strength, and design flexibility. These materials are used in critical areas of engineering practice, so this makes their long-term aging and fatigue characteristics of paramount importance. At the same time, the characteristics of these materials essentially changed after long-term operation. Thus, investigations of aging of these materials are much needed. Experimental studies on alternation of cyclic loading, climatic and thermal aging were conducted to study the characteristics of unidirectional carbon fiber reinforced plastic of the T107/ON190/R132436 mark. Experimental results shown a significant hardening during cyclic experiments, which considerably depends on the aging program. 10.18149/MPM.5212024_11 composite materials carbon fiber reinforced plastics degradation climatic aging deformation aging fatigue strength https://mpm.spbstu.ru/article/2024.100.11/ 11-AR-Arutyunyan.pdf

RAR RUS 126-131 I.N. Ulyanov Chuvash State University Egorov E.N.

Cheboksary, Russia

I.N. Ulyanov Chuvash State University Kol’tsov

Cheboksary, Russia

Influence of glass fibers on the physico-mechanical and performance properties of rubber based on general and special purpose caoutchoucs The effect of glass fibers (GF) on the rheometric (vulcanization) characteristics of the rubber compound, physico-mechanical, performance and dynamic properties of vulcanized rubber based on general and special purpose caoutchoucs for rail fastenings has been studied. It is shown that with the introduction of GF into the rubber compound, an increase in the minimum torque and the time of the onset of vulcanization is observed. An increase in the content of GF in the rubber compound leads to an increase in elastic-strength properties, hardness, a decrease in tear resistance and changes in physico-mechanical parameters, hardness of vulcanizates after daily thermal aging in air and after exposure to standard SZhR-1 liquid. GF contribute to an increase in the mechanical loss factor and the storage modulus of vulcanizates. It was found that the rubber compound containing 12.0 phr, has improved technological properties, and vulcanizates based on it are characterized by increased physico-mechanical, performance and dynamic parameters. 10.18149/MPM.5212024_12 glass fibers caoutchoucs rubber rheometric physico-mechanical performance and dynamic properties https://mpm.spbstu.ru/article/2024.100.12/ 12-Egorov_et-al(1).pdf

RAR RUS 132-141 0000-0002-3118-9745 Dr. Vishwanath Karad MIT World Peace University Ropalekar A.R.

Pune, India

57222344585 0000-0002-4883-8174 MIT World Peace University Ghadge

Kothrud, Pune, India

57210375018 0000-0002-3270-0699 Dr. Vishwanath Karad MIT World Peace University Anekar

Pune, India

Experimental investigation on flexural fatigue strength of graphene oxide modified E-glass epoxy composite beam Many studies are currently being performed on the complex issue of fatigue of reinforced composite materials. Graphene oxide (GO) is a strong contender for reinforcement, an atomically thin form of carbon with remarkable multifunctional qualities and a perfect surface for interacting with polymer matrices. This report investigates the effect of GO modified epoxy resin on the flexural fatigue life of a composite beam. First, two different weight concentrations of 0.25 and 0.50 % are dispersed by ultrasonication in epoxy resin and composite beams are prepared through a hand layup process. The microscopic analysis confirmed the uniform dispersion. The static bend test resulted in an increase in the flexural strength of the GO-incorporated beam by 33.3 % compared with that of the neat epoxy beam. Flexural fatigue tests were performed for different load levels, and damage evolution at every 4000th cycle was observed. It was noted that under 60 % loading, a significant change in damage initialization was observed between neat epoxy and 0.25 % GO. However, under a higher load level, a negligible effect of crack initialization was observed in all types of beams. 10.18149/MPM.5212024_13 epoxy composite flexural fatigue graphene oxide https://mpm.spbstu.ru/article/2024.100.13/ 13-AR-Ropalekar.pdf

RAR RUS 142-149 Institute of Strength Physics and Materials Science SB RAS Galchenko

Tomsk, Russia

Jinfeng Co., Ltd. Dampilon

Shenyang, China

National Research Tomsk Polytechnic University Kolesnikova

Tomsk, Russia

Formation features of microstructure, elemental and phase compositions of the C-Cr-Mn-V-Fe coatings under conditions of electron beam (EB) Surfacing in vacuum The microstructure and interphase distribution of chemical elements in multilayer coatings made of white cast iron in Fe-Cr-V-C system additionally alloyed with manganese and obtained using electron-beam surfacing in vacuum have been investigated. It is shown that in deposited state the surface of Cr-V-Mn cast iron coating is represented by the composite structure of "austenitic manganese containing matrix - carbides V2C, Me7C3 of variable composition" with high abrasive wear resistance (Ki = 9.4) similar to chrome vanadium cast iron coatings with an austenitic-martensitic matrix, but with significantly better abrasive wear resistance compared to cast iron coatings with an austenitic matrix stabilized by nickel. 10.18149/MPM.5212024_14 white cast iron layered electron beam (EB) surfacing microstructure carbides matrix vanadium manganese wear resistance https://mpm.spbstu.ru/article/2024.100.14/ 14-Galchenko%2C-et-al.pdf

RAR RUS 150-155 Ukhta State Technical University Grigoryeva

Ukhta, Russia

Ukhta State Technical University Khabarov

Ukhta, Russia

Engineering and technical center of OOO Gazprom transgaz Ukhta Khabarova

Ukhta, Russia

Evaluation of the efficiency of anti-corrosive protective coating based on epoxy polymers for protecting pipelines and metal structures Studies have been carried out to assess the effectiveness of a protective anticorrosive internal coating for pipelines and metal structures, made on the basis of an epoxy polymer material modified with nanoparticles of aluminum oxide. The proposed protective coating has been checked for compliance with the specified characteristics: high corrosion resistance and abrasion resistance, resistance to icing, high adhesion to the protected material, processability of application. 10.18149/MPM.5212024_15 protective coating corrosion resistance icing composite material epoxy polymers edge angle adhesion https://mpm.spbstu.ru/article/2024.100.15/ 15-Grigoryeva_et-al-.pdf