Materials physics and mechanics

RAR RUS 271-287 Greek Atomic Energy Commission Lasithiotakis

Agia Paraskevi – Athens, Greece

University of Oxford Marrow

Oxford, UK

The University of Manchester Marsden

Manchester, UK

Evaluation of damage induced in graphite due to sample preparation by standard non-destructive techniques Damage introduced to graphite by mechanical polishing, argon ion beam polishing, fracture, and neutron bombardment has been studied in polycrystalline graphites and Highly Oriented Pyrolytic Graphite (HOPG). Scanning Electron Microscopy and Atomic Force Microscopy, as well as X-Ray Diffraction and Raman spectroscopy, were employed. The least disturbed surfaces are observed in pristine HOPG or by fracturing techniques that exposed pre-existing defects. A decrease of the mean particle size of the abrading medium and the use of ions and neutrons increased the D band and decreased the pseudo–crystallinity 10.18720/MPM.4432020_1 graphite ion irradiation surface preparation https://mpm.spbstu.ru/article/2020.77.1/ 1-Michael-Lasithiotakis-James-T_-Marrow-Barry-J_-Marsden.pdf

RAR RUS 288-305 Li Federal Science Center Scientific Research Institute for System Analysis of Russian Academy of Sciences Smirnov

Moscow, Russia

Pestov Qi Kiselev An approximate analytical solution for hydraulic fracture opening under non-uniform internal pressure Because of the special non-uniform pressure distribution in hydraulic fracture, an especial hypothesis is proposed to get an approximate solution for the fracture opening, which satisfies the mixed boundary conditions on the fracture edges with the use of Bessel function integral properties. Error analysis of this approximate solution compared with the accurate solution is carried out. It is proved that the approximate solution is in good agreement with the accurate solution under the condition of this special pressure distribution in hydraulic-fracturing. 10.18720/MPM.4432020_2 hydraulic-fracturing fracture opening analytical solution Bessel function https://mpm.spbstu.ru/article/2020.77.2/ 2-Kairui-Li-et-al.pdf

RAR RUS 306-315 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

Southern Scientific Center RAS Telyatnikov

Rostov-on-Don, Russia

On the influence of multiple surface defects on the behavior of media of different rheology The behavior of coated media is investigated using the block element method under the assumption that the coating is exposed to a liquid substance that gradually leads to the destruction of the coating. It is assumed that the coating contains many defects that are parallel to each other. A similar situation occurs when the body is bent around the axis in a liquid medium, resulting in high tensile stresses in the coating. Such problems occur in bearing pairs. Another example of such a situation occurs in seismology, in the subduction zone, which represents the advance of oceanic lithospheric plates under the continental ones. 10.18720/MPM.4432020_3 cracks block elements coatings with defects Kirchhoff plates liquid layer set of defects stress concentration subduction tsunami https://mpm.spbstu.ru/article/2020.77.3/ 3-V_A_-Babeshko%2C-O_V_-Evdokimova%2C-O_M_-Babeshko.pdf

RAR RUS 316-323 ITMO University Sibirev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Fedorov

St.Petersburg, Russia

St. Petersburg State University Shtrom

St.Petersburg, Russia

ITMO University Bolshakov

St.Petersburg, Russia

St. Petersburg Academic University Berdnikov

St.Petersburg, Russia

Control of (Al,Ga)P composition in self-catalyzed nanowire growth Composition of ternary III-V nanowires became a subject of recent intensive studies inspired by several optoelectronic applications. Among these nanostructures, phosphide nanowires possess a wider bandgap making it especially promising for applications operating in the green visible range. However, unlike other III-V materials, the growth of AlGaP nanowires remains rather unexplored. In this work, we model the stationary composition of self-catalyzed AlGaP grown by molecular beam epitaxy. We show that under a wide range of growth parameters our theoretical approach does not require any fitting parameter and thus allows direct interpretation of experimental data. The obtained numerical results demonstrate a tendency to Al domination over Ga at rather low fluxes of the first. Interesting phenomena of the rise of Al fraction with an increase of the total group III flux is demonstrated. On the other hand, high tolerance of the chemical composition to the temperature, concentration of phosphorus in the droplet, and adatom kinetics is shown numerically. 10.18720/MPM.4432020_4 gallium arsenide phosphide ternary nanowire composition modeling https://mpm.spbstu.ru/article/2020.77.4/ 4-Berdnikov-et_-al.pdf

RAR RUS 324-331 Manipal University Jaipur Chakraborty

India

Manipal University Jaipur Rathi

India

Manipal University Jaipur Singh

India

Manipal University Jaipur Goyal

India

Determination of mechanical properties of graphene reinforced Tetra-GEDVA nanocomposite In the present study, effects of aspect ratio and perforation on the elastic response of graphene nanosheet (GNS)-embedded Tetra GEDVA (triglycidyl ether of divanillyl alcohol) nanocomposite plate are studied by material studio analysis. A dense amorphous cell is created using the Forcite module and simulation is performed. Young's modulus is predicted at varying strain rates from 0-1 GPa. The study conducted coarse-grained molecular dynamics (MD) simulations of Nano-indentation of PMMA (polymethyl methacrylate) polymer to study the variation of the elastic properties near the interface between the indenter and the substrate. Results have revealed that Young's modulus increases with an increase in reinforcement quantity. Keywords: MD simulation, 10.18720/MPM.4432020_5 MD simulation TetraGEDVA PMMA graphene nanocomposite https://mpm.spbstu.ru/article/2020.77.5/ 5-Ashish-Goyal-et-al.pdf

RAR RUS 332-347 Institute of Shipbuilding Technology Bhagat

India

National Institute of Technology Jeyaraj

Karnataka, India

Structural behavior of FG-CNT cylindrical panel: influence of non-uniform temperature field In this study, the influence of non-uniform temperature field and temperature-dependent properties on buckling and free vibration behavior of functionally graded carbon nanotube (FG-CNT) reinforced composite cylindrical panel is investigated. For the structural analysis, the finite element method and modal assurance criterion (MAC) analysis are performed. It is found that the temperature-dependent properties and nature of temperature variation fields affect the thermal buckling strength of the panel greatly. The results from MAC analysis reveals that the influence of temperature and nature of temperature variation on buckling and free vibration modes are significant. Further, it is also found that variations in frequencies and associated modes are significant at a temperature closer to buckling temperature. 10.18720/MPM.4432020_6 carbon nanotube non-uniform heating cylindrical panel finite element method thermal buckling free vibration https://mpm.spbstu.ru/article/2020.77.6/ 6-Vinod-Bhagat%2C-P_-Jeyaraj.pdf

RAR RUS 348-365 Peter the Great St. Petersburg Polytechnic University Vasilyev

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kolbasnikov

St.Petersburg, Russia

Modeling of static recrystallization in complexly alloyed austenite To predict the kinetics of static recrystallization and the resulting grain size in austenite of alloyed steels including additions of Nb, V, and Ti, a quantitative model is developed. Physically motivated, the model relates the activation energy of the process with that of bulk self-diffusion. The known dependence of the latter on the chemical composition of austenite solid solution, established previously, essentially simplifies the modeling. Employed empirical parameters have been fitted to relevant data covering a wide range of chemical compositions (23 steels) and sizes of recrystallized austenite grains. The model satisfactorily complies with experiments on steels whose apparent activation energy of recrystallization varies from 146.1 to 308.1 kJ/mol. It is notable as well that this performance has been achieved with no direct allowance for the pinning of grain boundaries by solute atoms (solute drag effect). 10.18720/MPM.4432020_7 steels austenite recrystallization recovery precipitation carbonitrides kinetics modeling https://mpm.spbstu.ru/article/2020.77.7/ 7-A_A_-Vasilyev-et-al.pdf

RAR RUS 366-379 Peter the Great St. Petersburg Polytechnic University Vasilyev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zisman

St.Petersburg, Russia

Experimental study and modeling of pre-deformation effect on austenite to ferrite transformation Transformation kinetics of undeformed and deformed austenite during continuous cooling has been investigated on several industrial steels. Dimensions of both prior austenite grains and ferrite grains in ferrite-pearlite structures obtained for various states of parent austenite and cooling rates were determined. Based on the obtained experimental data a physically motivated model is formulated for the ferritic transformation with allowance for the effects of deformation and concurrent recovery of austenite. Under consideration is the deformation influence on both the nucleation and growth of the ferrite grains. The model is first to evaluate the variation of nucleation barriers owing to the hydrostatic component of internal stresses at austenite grain boundaries. The modeling results significantly dependent on this issue comply well with experimental data on the kinetics of ferritic-pearlitic transformation and final ferrite grain size in the considered steels. 10.18720/MPM.4432020_8 steels austenite deformation recovery transformation ferrite modeling https://mpm.spbstu.ru/article/2020.77.8/ 8-A_A_-Vasilyev%2C-D_F_-Sokolov%2C-S_F_-Sokolov%2C-A_A_-Zisman.pdf

RAR RUS 380-391 Universitas Pendidikan Indonesia Nandiyanto

Bandung, Indonesia

Universitas Pendidikan Indonesia Fiandini

Bandung, Indonesia

Universitas Pendidikan Indonesia Ragadhita

Bandung, Indonesia

Universitas Pendidikan Indonesia Sukmafitri

Bandung, Indonesia

Universitas Pendidikan Indonesia Salam

Bandung, Indonesia

Sampoerna University Triawan

Indonesia

Mechanical and biodegradation properties of cornstarch-based bioplastic material The purpose of this study was to investigate mechanical and biodegradation properties of bioplastic from pure cornstarch (with no additional reinforcing components). The following fabrication procedure was done: (1) diluting cornstarch in water, (2) making homogeneous mixture of the diluted cornstarch, glycerol, and acetic acid by heating at less than 100ºC, (3) molding process, and (4) drying process to get a solid bioplastic. The present bioplastic had good biodegradability properties, degraded easily within 2-week soaking in water, confirmed by the weight loss and appearance of fungi on its surface. Good mechanical performance was obtained although it is still low compared to the standard bioplastic in moderate grade. Indeed, additional reinforcing components (e.g., co-polymer or additive) is required for improving the mechanical properties. 10.18720/MPM.4432020_9 bioplastics cornstarch education tensile strength Young's modulus https://mpm.spbstu.ru/article/2020.77.9/ 9-A_B_D_-Nandiyanto-et-al.pdf

REP RUS 392-403 Southern Federal University Kudimova

Rostov-on-Don, Russia

Southern Federal University Nadolin

Rostov-on-Don, Russia

Southern Federal University Nasedkin

Rostov-on-Don, Russia

Southern Federal University Nasedkina

Rostov-on-Don, Russia

Southern Federal University Oganesyan

Rostov-on-Don, Russia

Southern Federal University Soloviev

Rostov-on-Don, Russia

Finite element homogenization of piezocomposites with isolated inclusions using improved 3-0 algorithm for generating representative volumes in ACELAN-COMPOS package The paper considers the homogenization problems on the determination of the effective moduli of piezoceramic materials with elastic inclusions. The numerical solutions have been obtained by the effective moduli method and finite element method for the representative volumes with granular inclusions created in ACELAN-COMPOS package according to the original 3-0 algorithm. New features of this algorithm allow the user to vary different characteristics of the generated granules. The provided examples of finite element computations illustrate the influence of the shapes of granules and their locations on the effective properties of piezocomposites. 10.18720/MPM.4432020_10 piezoelectricity two-phase piezocomposite inclusion effective modulus representative volume finite element method finite element software ACELAN-COMPOS https://mpm.spbstu.ru/article/2020.77.10/ 10-A_V_-Nasedkin-et-al.pdf

RAR RUS 404-410 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Siberian State Industrial University Zorya

Novokuznetsk, Russia

Altai State University Rakitin

Barnaul, Russia

Financial University under the Government of the Russian Federation Glubokova

Moscow, Russia

The binding energy of impurity atoms C, N, O with edge dislocations and the energy of their migration along dislocation core in Ni, Ag, Al Using the molecular dynamics method, the binding energies of impurity atoms of light elements C, N, O with edge dislocations, and the energy of their migration along with dislocation core in metals with fcc lattice Ni, Ag, and Al were calculated. The binding energies of impurity atoms with partial and stair-rod dislocations, as well as with jogs on them, were calculated. It is shown that the binding energy with partial dislocations is significantly lower than with stair-rod ones. The binding energy of an impurity atom with a dislocation is determined mainly by two factors: the depth of the interaction potential of the impurity atom with metal atoms and the ratio of their sizes. For this reason, in most cases, the binding energy for carbon with dislocations was greater than for oxygen atoms. The values of the activation energy of the impurity atoms diffusion along a dislocation core were found. The obtained values are several times lower than the activation energy of impurity diffusion in a pure crystal. 10.18720/MPM.4432020_11 molecular dynamics metal impurity dislocation binding energy activation energy https://mpm.spbstu.ru/article/2020.77.11/ 11-G_M_-Poletaev-et-al.pdf

RAR RUS 411-422 Kakatiya University Gurijala

Telangana, India

Kakatiya University Perati

Telangana, India

Study of radial vibrations in thick walled hollow dissipative poroelastic spherical shell on elastic foundation This paper deals with radial vibrations of dissipative poroelastic spherical shell embedded on the elastic foundation. The case of dissipation results in a transcendental, complex valued frequency equation, and the numerical results are not possible. Hence, the limiting case is considered. When the argument is small, the asymptotic expansions of Bessel functions can be employed and consequently frequency equation can be separated into two real valued equations which in turn give phase velocity and attenuation. In this case, a thick walled hollow spherical shell becomes a thin spherical shell. Phase velocity is computed as a function of the wavenumber, and attenuation is computed against the ratio of outer and inner radii. The results with the elastic foundation are compared with that of without elastic foundation. In the absence of dissipation, the phase velocity is computed and the comparison is made between the present work and earlier works. 10.18720/MPM.4432020_12 poroelastic spherical shell frequency equation phase velocity attenuation elastic foundation https://mpm.spbstu.ru/article/2020.77.12/ 12-Rajitha-Gurijala%2C-Malla-Reddy-Perati.pdf

RAR RUS 423-432 Southern Federal University Chebakov

Rostov-on-Don, Russia

Southern Federal University Poddubnyy

Rostov-on-Don, Russia

Southern Federal University Kolosova

Rostov-on-Don, Russia

Bulgarian Academy of Sciences Alexiev

Sofia, Bulgaria

Bulgarian Academy of Sciences Datcheva

Sofia, Bulgaria

Contact interaction of axisymmetric indenter and poroelastic foundation This paper discusses axially symmetric contact problems of rigid punch and poroelastic foundation interaction employing Cowin-Nunziato linear poroelasticity model. It is assumed that the punch base has a flat or parabolic shape, and the contact friction is neglected. Using Hankel's integral transform the considered contact problem is reduced to a solution of a singular integral equation with unknown contact stress. To solve this integral equation, the collocation technique is used. In the case of parabolic punch, the contact pressure and the contact area were calculated. Then it is investigated the relation between the force applied to the punch and its displacement, which is one of the main characteristics in material properties determination by means of instrumented indentation method. A comparative analysis of considered quantities for various porosity values was carried out. 10.18720/MPM.4432020_13 contact problem porous materials poroelasticity Cowin-Nunziato model axisymmetric contact problem collocation method instrumented indentation test https://mpm.spbstu.ru/article/2020.77.13/ 13-M_I_-Chebakov-et-al.pdf

RAR RUS 433-438 Ogarev Mordovia State University Cherkasov

Saransk, Russia

0000-0002-1069-2413 Ogarev Mordovia State University Avdonin

Saransk, Russia

0000-0003-4310-3379 Vyatka State University Yurkin

Kirov, Russia

Sarov Physics Technical Institute National Research Nuclear University “MEPhI” Scherbak

Sarov, Russia

Russian Federal Nuclear Center, All-Russia Research Institute of Experimental Physics Buzoverya

Sarov, Russia

Russian Federal Nuclear Center, All-Russia Research Institute of Experimental Physics Karpov

Sarov, Russia

Ogarev Mordovia State University Pilshchikov

Saransk, Russia

Research of radiation resistance of polymer composite materials The results of comprehensive studies of radiation shielding properties and the structure of elastic self-adhesive coverings are presented. It was found that there was no change in the linear absorption coefficient of radiation, structural damage is minor at irradiation doses which are significantly higher than standard (105 Gy). 10.18720/MPM.4432020_14 radiation shielding elastic self-adhesive coverings linear absorption coefficient radiation resistance microstructure EPDM https://mpm.spbstu.ru/article/2020.77.14/ 14-V_V_-Avdonin-et-al.pdf

RAR RUS 439-445 NRC "Kurchatov Institute" -CRISM "Prometey" Mel'nikov

St.Petersburg, Russia

NRC "Kurchatov Institute" -CRISM "Prometey" Motovilina

St.Petersburg, Russia

NRC "Kurchatov Institute" -CRISM "Prometey" Karpov

St.Petersburg, Russia

The CRISM “Prometey” Khlusova

St.Petersburg, Russia

Structure and properties of argon-arc welds of high-strength steel Hardness, impact toughness, and structure of slot gap welds (TIG) of low alloyed steel with the ensured yield stress of 890 MPa have been investigated. According to obtained results, the considered technological procedure provides equal strength of the weld and base metals as well as appropriate cold resistance. 10.18720/MPM.4432020_15 high-strength steel argon-arc gap welding hardness impact toughness structure weld metal heat affected zone https://mpm.spbstu.ru/article/2020.77.15/ 15-Khlusova-et-al.pdf