Materials physics and mechanics

RAR RUS 365-372 Fraunhofer Institute for Integrated Circuits IIS Rubinova

Erlangen, Germany

Peter the Great St. Petersburg Polytechnic University Loboda

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krivtsov

St.Petersburg, Russia

Heat transfer in infinite one-dimensional crystal considering the third coordination sphere The work focuses on the analytical description of unsteady thermal processes in low-dimensional structures. The object of study is an infinite one-dimensional harmonic crystal with interactions up to the third coordination sphere. The paper explains how a variation in bond stiffness between particles of different coordination spheres affects the behaviour of the system. The fundamental solution to the heat propagation problem has been constructed and investigated. It is shown that the initial thermal perturbation evolves into several consecutive thermal waves propagating with finite velocities. The number, the velocities, and the intensity coefficients of these waves are determined by the bond stiffnesses. 10.18149/MPM.5032022_1 harmonic crystal third coordination sphere unstationary heat transfer heat waves fundamental solution https://mpm.spbstu.ru/article/2022.92.1/ 1-R_V_-Rubinova%2C-O_S_-Loboda%2C-A_M_-Krivtsov.pdf

RAR RUS 373-387 New Horizon College of Engineering Veeresha

Bangalore, India

Acharya Institute of Technology Manjunatha

Bangalore, India

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

Bangalore, India

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

Tumkur, India

Sri Venkateswara College of Engineering Bharath

Bangalore, India

Synthesis and wear behavior of varying particle sized B4C reinforced Al2618 alloy composites In this work, the influence of reinforcement particle size and weight percentage on the wear behavior of Al2618 alloy composites was investigated. 63, 44 and 20 microns varying sized B4C reinforced Al2618 composites were synthesized with 4 and 8 wt. % of B4C using novel two stages stir cast method. Al2618 alloy with 63, 44, and 20 micron sized B4C composites were studied for microstructural characterization by SEM and EDS. Further, to know the particle size effect on the behavior of Al2618 alloy, hardness, wear, and worn morphology studies were carried out. Wear tests were conducted at varying loads 10 N to 40 N at a constant sliding velocity of 2.08 m/sec, similarly, one more set of was studies were done by varying speeds of 0.52 m/sec to 2.08 m/sec at a constant 40 N load. Microstructural characterization revealed the uniform distribution of particles in the Al2618 alloy and elements were confirmed by EDS spectrums. The hardness of Al2618 alloy was enhanced with 63, 44, and 20 micron sized B4C particles. With the addition of varying particle sized B4C all the wear properties were improved. Load and speed affected the wear behavior of all the prepared samples. Worn morphology studies confirmed the various wear mechanisms involved in the tested samples. 10.18149/MPM.5032022_2 Al2618 Alloy B4C Microstructure Hardness Wear Properties Worn Morphology https://mpm.spbstu.ru/article/2022.92.2/ 2-G_-Veeresha%2C-B_-Manjunatha-et-al.pdf

RAR RUS 388-400 National Research Tomsk State University Kudryashova

Tomsk, Russia

National Research Tomsk State University Toropkov

Tomsk, Russia

National Research Tomsk State University Lerner

Tomsk, Russia

National Research Tomsk State University Vorozhtsov

Tomsk, Russia

Mathematical model of extrusion in FDM 3D printing technology We proposed a mathematical model of flow and extrusion in the 3D printing process (FDM technology). The model is based on fluid mechanics and uses conservation laws taking into account friction losses and local resistance losses. We performed a parametric study of the model. We have obtained experimental data on the rheology of compositions based on bimodal powders containing micro- and nanoparticles. The rheological properties of low-filled mixtures of powders with polymer differ from those of highly-filled mixtures of bimodal powders. These data are used as the basis for calculating the extrusion rate of compositions in FDM 3D printing of the considered compositions. The results of calculations of the extrusion rate depending on temperature, pressure, and dispersion of powders are given in the report. The search for optimal printing parameters based on mathematical modeling of the process is the goal of this work. 10.18149/MPM.5032022_3 extrusion 3D printing FDM technology bimodal powders mathematical model https://mpm.spbstu.ru/article/2022.92.3/ 3-O_B_-Kudryashova-et-al.pdf

RAR RUS 401-409 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

The void evolution kinetics driven by residual stress in icosahedral particles A kinetic model of vacancy diffusion induced by both the Gibbs-Thompson curvature effect and stress state of the Marks-Ioffe stereo-disclination in a hollow spherical particle is suggested to investigate the void evolution in hollow icosahedral particles. The obtained analytically vacancy concentration profile inside the hollow icosahedral particle is employed to derive numerically the evolution equation of void kinetics. It is shown that the scenario of void evolution in icosahedral particles strongly depends on the inner-to-outer radius ratio at the initial moment of time and on the value of dimensionless parameter α reflecting the contribution of a pressure-induced (drift) vacancy flux between the external and internal particle surfaces. 10.18149/MPM.5032022_4 Icosahedral small particles residual stress stress relaxation disclination hollow particles spherical pore pressure-induced diffusion https://mpm.spbstu.ru/article/2022.92.4/ 4-A_S_-Khramov%2C-S_A_-Krasnitckii%2C-et-al.pdf

RAR RUS 410-419 57209342766 0000-0001-8732-9615 Federal State-Financed Educational Institution of Higher Learning "Komsomolsk-na-Amure State University" Andrianov

Komsomolsk-on-Amur, Russia

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

Komsomolsk-on-Amur, Russia

Bearing capacity of spherical thick-walled shell taking into account compressibility and nonlinear plasticity The stress-strain state of a thick-walled spherical shell is considered under the conditions of compressibility of the material and the nonlinear law of hardening. Using the equations of the relationship between stresses and deformations according to the method of variable elasticity parameters, an integral equation of compatibility of logarithmic deformations is obtained. When performing numerical calculations using the method of simple iterations, the moment of unstable deformation of the spherical shell is determined. The dependences of the relative pressure on the radial displacement of the points of the outer surface of the spherical shell are obtained, taking into account the compressibility of the material and without taking into account the compressibility for an ideal elastic-plastic material and for an elastic-plastic material with nonlinear hardening. According to the results of numerical calculation, failure to account for compressibility introduces a significant error in the calculation of radial displacements of the outer surface. The results of the study will allow us to determine the maximum permissible load of a thick-walled spherical shell corresponding to stable deformation. 10.18149/MPM.5032022_5 thick-walled shell sphere compressibility of the material physical nonlinearity stress-strain state variable elasticity parameters shaping https://mpm.spbstu.ru/article/2022.92.5/ 5-I_K_-Andrianov%2C-S_I_-Feoktistov.pdf

RAR RUS 420-430 Belarusian State University of Informatics and Radioelectronics Boiprav Olga V.

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Savanovich

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Belousova Elena S.

Minsk, Belarus

Flexible microwave absorbers based on powdered activated coconut charcoal and moisture-containing ceramsite The article presents the results of the development of the technology for manufacturing flexible microwave absorbers, the fillers of which are powdered activated coconut charcoal and moisture-containing ceramsite, and the matrix for these materials' particles holding is polyurethane mastic. The results of the study of the regularities of the electromagnetic radiation interaction in the frequency range of 0.7-17.0 GHz with absorbers, manufactured according to the developed technology, depending on the size of the ceramsite particles contained in them, are presented. On the basis of these results, it was found that the studied absorbers, in comparison with absorbers, filled with moisture-containing ceramsite, are characterized by lower values of the electromagnetic radiation reflection coefficient in the frequency range of 0.7-17.0 GHz, reaching a value of -20.0 dB. In this case, the values of their electromagnetic radiation transmission coefficient in the indicated frequency range reach the value of -43.0 dB. Microwave absorbers, manufactured according to the developed technology, are promising for use in order to solve problems related to ensuring the functional reliability of radio electronic equipment, as well as ensuring environmental safety and information security. 10.18149/MPM.5032022_6 activated coconut charcoal ceramsite microwave absorber reflection coefficient transmission coefficient https://mpm.spbstu.ru/article/2022.92.6/ 6-O_V_-Boiprav%2C-S_E_-Savanovich%2C-E_S_-Belousova.pdf

RAR RUS 431-438 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

Ioffe Institute Orlova T.S.

St.Petersburg, Russia

Grain-boundary nanoprecipitates-mediated mechanism of strengthening in Al-Cu-Zr alloy structured by high-pressure torsion The theoretical model is suggested which describes a new micromechanism of strengthening in the ultrafine-grained Al-Cu-Zr alloy subjected to severe plastic deformation. The departure point in this theoretical model is the assumption that the key role in the plastic deformation of high-pressure torsion processed ultrafine grained Al is played by extrinsic grain boundary dislocations (EGBDs) gliding along non-equilibrium grain boundaries and forming dislocation pile-ups at triple junctions of the grain boundaries. Within the model, nanoprecipitates of Al2Cu at grain boundaries act as obstacles for the slip of extrinsic grain-boundary dislocations (EGBDs) that leads to a significant increase in the strength of the Al-Cu-Zr alloy. The plastic deformation occurs through the emission of lattice dislocations from the pile-up of EGBDs pressed to a triple junction of grain boundaries. It is shown that the division of gliding EGBDs into separate pile-ups by nanoprecipitates can provide substantial additional hardening of the alloy. The proposed model is in good quantitative agreement with available experimental results. 10.18149/MPM.5032022_7 ultrafine-grained aluminum alloys; grain boundary defects; precipitation; dislocations; plastic deformation https://mpm.spbstu.ru/article/2022.92.7/ 7-M_Yu_-Gutkin%2C-N_V_-Skiba%2C-T_S_-Orlova.pdf

RAR RUS 439-458 National Institute of Technology Kurukshetra Kumar

Haryana, India

0000-0002-5648-6113 National Institute of Technology Kurukshetra Singh

Haryana, India

National Institute of Technology Kurukshetra Angra

Haryana, India

Effect of reinforcements on mechanical and tribological behavior of magnesium-based composites: a review The challenges faced in the development of light materials, motivate researchers to produce materials with improved characteristics, which have wide applications in the biomedical, automotive, defense, and aviation industries. The limited availability of monolithic or natural materials on the earth can be another reason to develop a newer version of metals, alloys, and composites. These developed materials should have enhanced physical, mechanical, and tribological properties. The present article discusses the effect of numerous reinforcements with different weight/volume percentages on the hardness, tensile strength, corrosion, and wear resistance of Mg-based metal matrix composites (Mg-MMCs). It has been observed that the hardness and tensile strength of Mg-MMCs range from 34-152.7 HV and 45-240 MPa, respectively, and its corrosion current density reduces from 549.21-1.923 µA cm-2. This research paper also focused on the effect of various wear and friction process parameters such as applied load (10-80 N), sliding distance (100-2000 m), sliding velocity (1-3 m/s), sliding time (5-30 minutes), and the effect of different weight/volume reinforcement percentages (0-25%) on the performance of Mg-MMCs during wear and friction phenomenon. The material loss during wear measurement and coefficient of friction (COF) of Mg-MMCs ranges from 0.0174 -0.09 g and 0.90-0.0234, respectively. 10.18149/MPM.5032022_8 MMC magnesium bio-medical tensile strength hardness corrosion wear friction https://mpm.spbstu.ru/article/2022.92.8/ 8-Dinesh-Kumar%2C-Satnam-Singh%2C-Surjit-Angra.pdf

RAR RUS 459-474 Peter the Great St. Petersburg Polytechnic University Alhimenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Breki

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Shaposhnikov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Kharkov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Alekseeva

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Lapechenkov

St. Petersburg, Russia

Corrosion cracking of low alloy steels. Testing methods The paper presents a brief overview of modern literature describing the mechanisms behind stress corrosion cracking of low-alloy steels in aqueous environments saturated with aggressive gases, such as hydrogen sulfide, and carbon dioxide, where atomic hydrogen is produced due to electrochemical reactions, subsequently penetrating the metal in the locations where it is dissolved or other surface defects are present. We described the main testing methods for stress corrosion cracking, their differences, and the criteria for assessing the corrosion cracking tendency of steels. Examples were given for applying metallographic and electrochemical analysis to explore the mechanism of stress corrosion cracking in the given steels. 10.18149/MPM.5032022_9 low-alloy steels stress corrosion cracking testing methods crack initiation crack growth anodic dissolution hydrogen embrittlement https://mpm.spbstu.ru/article/2022.92.9/ 9-A_A_-Alhimenko%2C-A_A_-Kharkov-et-al.pdf

RAR RUS 475-484 Institute of Engineering Science, Ural Branch, Russian Academy of Sciences Emelyanov

Ekaterinburg, Russia

Ural Federal University Kislov

Ekaterinburg, Russia

Strength analysis of thin-wall structures operating in aggressive environments for prolonged periods A method is proposed for determining the strength of a metal shell structure under mechanical loading and prolonged contact with an aggressive hydrogen-containing medium. The mechanical properties of the structural material change under the influence of such media. Steels exhibit a decrease in ductility, which is called hydrogen embrittlement. This effect must be taken into account when assessing the strength of steel structures operating in contact with hydrogen-containing media. The method is illustrated with an example of a steel cylindrical pipe in contact with a hydrogen sulfide-containing medium. Data obtained in the course of an earlier experiment are used to determine the mechanical parameters of the pipe material. The possibility of determining the mechanical parameters beyond the saturation time of the samples in the experiment is shown. 10.18149/MPM.5032022_10 shell hydrogen sulfide environment tension diagram brittleness neural networks long-term strength https://mpm.spbstu.ru/article/2022.92.10/ 10-I_G_-Emelyanov%2C-A_N_-Kislov.pdf

RAR RUS 485-494 Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Bharti

India

Kashi Institute of Technology Pradeep Kumar

Varanasi, India

Applications of waste egg shell and egg shell membrane: a review As poultry egg is a rich source of protein, World Health Organisation and all other health experts recommend human beings eat an egg daily. Therefore, there is a very high consumption of eggs throughout the world. The edible part of the egg is covered by a protective hard covering egg shell. With increasing egg consumption, egg shell waste is generated in huge amounts around the globe. Therefore, egg shell waste management became necessary to protect the environment as this can be hazardous. To overcome this problem, researchers and waste management experts are working on the development of techniques by which the egg shell waste can be used efficiently. As egg shell comprises mainly calcium carbonate and phosphate, it can be used for various industrial applications as a rich source of calcium, carbonates, CaO, etc. Because of the advantages of egg shell waste, it can be used for various industrial and household applications such as adsorbent, matrix, or reinforcement materials for making biocomposites, biotemplate, biocoating, glass foams, catalysts, etc. The present work discusses the egg shell and egg shell membrane applications in detail. 10.18149/MPM.5032022_11 applications of egg shell waste egg egg shell egg shell membrane waste management https://mpm.spbstu.ru/article/2022.92.11/ 11-Naveen-Kumar%2C-Ajaya-Bharti%2C-Pradeep-Kumar.pdf

RAR RUS 495-508 Institute of Continuous Media Mechanics UB RAS Garishin

Perm, Russia

Svistkov svistkov@icmm.ru Federal unitary state enterprise "Lebedev Research Institute for Synthetic Rubber" Voznyakovskii

St. Petersburg, Russia

Federal unitary state enterprise "Lebedev Research Institute for Synthetic Rubber" Tchypkina

St. Petersburg, Russia

Federal unitary state enterprise "Lebedev Research Institute for Synthetic Rubber" Neverovskaya

St. Petersburg, Russia

Institute of Continuous Media Mechanics UB RAS Shadrin

Perm, Russia

Anisotropic mechanical properties of elastomeric nanocomposites filled by carbon black, few-layer graphene, and carbon nanotubes The mechanical properties of nanocomposites based on styrene-butadiene rubber with fillers of carbon black, few-layer graphene and single-walled and multi-walled carbon nanotubes have been studied. Carbon nanotubes were subjected to preliminary purification according to a special technology developed by the authors using self-propagating high-temperature synthesis. It has been established that in elastomers filled with single-walled carbon nanotubes, the anisotropy of mechanical properties may appear, which is expressed in a significant increase of material rigidity and growth of dissipative tensile losses in the direction corresponding to the movement of vulcanized rubber compound during rolling. This effect was absent in composites filled with carbon black and few-layer graphene. 10.18149/MPM.5032022_12 styrene-butadiene rubber few-layer graphene single-walled and multi-walled carbon nanotubes SHS purification of carbon nanotubes cyclic loading viscoelasticity anisotropy of mechanical properties https://mpm.spbstu.ru/article/2022.92.12/ 12-O_K_-Garishin%2C-A_L_-Svistkov-et-al.pdf

RAR RUS 509-517 Institute of Machinery and Metallurgy of the Far Eastern Branch of the Russian Academy of Sciences Tkacheva

Komsomolsk-na-Amure, Russia

Institute of Machinery and Metallurgy of the Far Eastern Branch of the Russian Academy of Sciences Abashkin

Komsomolsk-na-Amure, Russia

Impact of forced cooling of the joint zone and thermal effect on the distribution values of residual stress generated by arc welding The search for technological options to obtain strong units with small deformation values determines the study of the local thermal effect on the distribution of residual stresses in permanent joints of metal structures made by arc welding with forced cooling. The mathematical model is based on the Prandtl-Reiss model in which the Hooke law is replaced by the Duhamel-Neumann law and the Mises criterion is supplemented by the Johnson-Cook strain hardening function. The elastic moduli, as well as the yield strength, are assumed to be temperature-dependent. The calculated values of residual stresses show the positive effect of forced cooling of the welded zone. 10.18149/MPM.5032022_13 welding mathematical model Johnson-Cook strain hardening function residual stresses deformation heat affected zone https://mpm.spbstu.ru/article/2022.92.13/ 13-A_V_-Tkacheva%2C-E_E_-Abashkin.pdf