Materials physics and mechanics

RAR RUS 543-556 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

Modeling of carbides and copper particles precipitation during tempering of bainitic-martensitic Cr-Mo-V-Cu steels The paper represents a model for the tempering effects on quenched bainitic-martensitic steels that describes both the recovery and precipitation phenomena. The latter involves various carbides (Fe3C, V4C3, Mo2C, Cr7C3) and particles of pure Cu. Thermodynamic driving forces in the nucleation of the considered particles have been calculated using empirical formulas obtained with the Thermo-Calc software. The predicted formation kinetics for the considered carbides and Cu particles complies well with relevant experimental data. 10.18149/MPM.4742021_1 steels tempering precipitation carbides copper modeling https://mpm.spbstu.ru/article/2021.83.1/ 1-A_A_-Vasilyev%2C-S_F_-Sokolov%2C-D_F_-Sokolov.pdf

RAR RUS 557-568 Indian Institute of Technology Roorkee Kamran

Roorkee, India

Indian Institute of Technology Roorkee Iqbal

Roorkee, India

Ballistic response and induced damage of plain and reinforced concrete plates The present study shows the comparison of ballistic response and induced damages of plain and reinforced concrete plates subjected to the normal impact of ogive-nosed steel projectiles. The evaluation of damage has been described by the presence of cracking and measuring the size of the crater in terms of equivalent diameter, formed at front and rear concrete surfaces. The ballistic limits of plain and reinforced concrete have been obtained through the varied projectile velocities. The Plain concrete experienced the cracking and cratering at the front and rear surfaces while the reinforced concrete plates experienced only cratering that has been found in the region smaller than that of the plain concrete, describing the influence of the reinforcement. The cratering at the rear surface of concrete plates decreased with an increase in the projectile incidence velocity while it remained unaffected at the front surface with respect to the incidence velocities. The penetration depth and scabbing limit of non-perforated plates are also calculated using empirical equations and compared with the actual results. The ballistic limit of the reinforced concrete plate has been found to be 13% higher than the plain concrete plate. 10.18149/MPM.4742021_2 ballistic limit concrete plates residual velocities induced damage https://mpm.spbstu.ru/article/2021.83.2/ 2-Kamran-Kamran%2C-M_A_-Iqbal.pdf

RAR RUS 569-576 Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Shayakhmetova

Ufa, Russia

Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Mukhametgalina

Ufa, Russia

Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Murzinova

Ufa, Russia

Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Nazarov

Ufa, Russia

Study of solid state joints of copper processed by ultrasonic welding By means of ultrasonic welding, solid-state joints of copper sheets with the initial coarse-grained structure were obtained. It is shown that in the course of ultrasonic welding, significant structural changes occur in the material in the joint region. A layer with an ultrafine-grained structure with a grain size of less than 1 μm is formed near the contact interface of the sheets, and elongated grains with developed substructure are observed in the bulk of the sheets in the welding zone. There are no structural changes outside the weld spot zone. The average lap shear strength of the specimens was 36 MPa. It is shown that the structural changes occurring during welding result in an increase in microhardness by factors of 1.2 and 1.5 in the bulks of sheets in the weld spot zone and in the weld joint as compared to that of the initial sheet (950, 1200, and 790 MPa, respectively). 10.18149/MPM.4742021_3 ultrasonic welding copper ultrafine grained structure https://mpm.spbstu.ru/article/2021.83.3/ 3-E_R_-Shayakhmetova-et-al.pdf

RAR RUS 577-581 Ioffe Institute Stepanov

St.Petersburg, Russia

Ioffe Institute Nikolaev

St.Petersburg, Russia

Tomsk State University Almaev

Tomsk, Russia

Ioffe Institute Pechnikov

St.Petersburg, Russia

Ioffe Institute Scheglov

Saint Petersburg, Russia

Ioffe Institute Chikiryaka

St.Petersburg, Russia

Tomsk State University Kushnarev

Tomsk, Russia

National University of Science and Technology MISiS Polyakov

Moscow, Russia

HVPE growth of corundum-structured α-Ga2O3 on sapphire substrates with α-Cr2O3 buffer layer Gallium oxide films were grown by HVPE on (0001) sapphire substrates with and without α-Cr2O3 buffer produced by RF magnetron sputtering. Deposition on bare sapphire substrates resulted in a mixture of α-Ga2O3 and ε-Ga2O3 phases with a dislocation density of about 2∙1010 cm-2. The insertion of α-Cr2O3 buffer layers resulted in phase-pure α-Ga2O3 films and a fourfold reduction of the dislocation density to 5∙109 cm-2. 10.18149/MPM.4742021_4 gallium oxide HVPE epitaxial layers chrome oxide https://mpm.spbstu.ru/article/2021.83.4/ 4-Stepanov-et-al.pdf

RAR RUS 582-591 Bangladesh University of Engineering and Technology Kaiser

Dhaka, Bangladesh

Effect of trace impurities on the thermoelectric properties of commercially pure aluminum Impurities play an important role in the properties of aluminum. Those are incorporated into commercially pure aluminum through repeated melting and samples are characterized for their thermal conductivity, dielectric and morphological properties as a function of cold deformation and annealing temperature. Results indicate that cold rolling increases thermal conductivity since reduces the porosity like defects but heavily coldworking decreases the conductivity because of distorts the crystal lattice. Material defects are more prominent than impurities in the material in the case of AC electrical properties. The dielectric constant and loss tangent decreases with annealing temperature initially due to stress reliving and increases due to the formation of metastable phases. Trace added alloys show more eutectic silicon and other Fe-rich intermetallic phases into the microstructure. 10.18149/MPM.4742021_5 aluminum impurities conductivity dielectric microstructure https://mpm.spbstu.ru/article/2021.83.5/ 5-M_S_-Kaiser.pdf

RAR RUS 592-599 Peter the Great St. Petersburg Polytechnic University Goncharenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kobykhno

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Bobrynina

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Tolochko

St.Petersburg, Russia

The mechanical properties improvement of thermoplastics-based fiber metal laminates This study investigated the possibility of increasing the fiber metal laminates mechanical properties by improving the impregnation quality due to the addition of a different number of layers of polymer film on the prepreg-metal interface. Specimens were made based on two thermoplastic polymers (polyamide-6 and polypropylene), glass fibers (E-glass), and aluminum alloy (AlMg6) by hot pressing. The theoretical calculation was performed for the tensile strength according to the rule of mixtures. The dependences of tensile strength, impact strength, and pattern failure modes on the fiber metal laminates structure and polymer type were produced. Options for improving metal-polymer adhesion up to 2.7 times by different methods of aluminum surface modification were shown. 10.18149/MPM.4742021_6 thermoplastic polymers fiber metal laminate rule of mixtures prepreg composite https://mpm.spbstu.ru/article/2021.83.6/ 6-Goncharenko-et-al.pdf

RAR RUS 600-607 Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Bharti

India

Kamla Nehru Institute of Technology Chauhan

Sultanpur, India

Effect of Ti reinforcement on the wear behaviour of AZ91/Ti composites fabricated by powder metallurgy The low corrosion and wear resistance of magnesium limit its industrial applications despite its very high strength to weight ratio and environment-friendly nature. Researchers are working on the development of high wear-resistant magnesium matrix composites. Different types of reinforcements (i.e., B4C, SiC, carbon nanotubes, graphite, Ti, etc.) are added to the magnesium matrix to enhance wear resistance. Still, metallic reinforcement titanium is most suitable because the addition of Ti increases wear resistance without compromising mechanical strength and ductility. The effect of volume fraction of Ti reinforcement on the wear resistance of AZ91/Ti composites fabricated by powder metallurgy is investigated in the present work. It was observed that the wear rate and coefficient of friction decreased with the addition of Ti in the Mg matrix, and the lowest value of the wear rate and coefficient of friction was observed for Mg/Ti composite reinforced with 6 vol.% Ti. 10.18149/MPM.4742021_7 AZ91 mg alloy powder metallurgy titanium composites wear rate https://mpm.spbstu.ru/article/2021.83.7/ 7-Naveen-Kumar%2C-Ajaya-Bharti.pdf

RAR RUS 608-612 113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

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

St.Petersburg, Russia

A model for annealing-induced hardening in ultrafine-grained metals We suggest a model, which describes the effect of grain boundary relaxation on the annealing-induced hardening in ultrafine-grained metals. Within the model, grain boundary relaxation during annealing is accompanied by a decrease in the number of grain boundary dislocation sources. The exhaustion of easily activated grain boundary dislocation sources results in the activation of harder grain boundary dislocation sources and/or repetitive action of the same dislocation sources. This gives rise to an increase in the strain hardening rate that can lead to an increase in the ultimate strength of ultrafine-grained solids. The results of the model agree with available experimental data. 10.18149/MPM.4742021_8 ultrafine-grained materials; hardening; annealing; grain boundaries https://mpm.spbstu.ru/article/2021.83.8/ 8-A_G_-Sheinerman%2C-S_A_-Krasnitckii.pdf

RAR RUS 613-620 Taraz Regional University named after M.H. Dulati Yussupova

Taraz, Kazakhstan

Novosibirsk Technological Institute (Branch) of Russian State University named after A.N. Kosygin Sokolovskiy

Novosibirsk, Russia

Taraz Regional University named after M.H. Dulati Munasipov

Taraz, Kazakhstan

Taraz Regional University named after M.H. Dulati Kulkaeva

Taraz, Kazakhstan

Al Farabi Kazakh National University, Institute of Information and Computer Technologies Kunelbayev

Almaty, Kazakhstan

Prediction of strength properties of natural fiber-porous composites by neural networks There is a real need to reduce the scope of determining the physical and mechanical properties of natural fiber-porous composites. The application of an artificial neural network for the prediction of the strength of natural chrome-tanned leather made of bovine and calfskin was investigated in this work. The results were obtained by applying a single-layer and a two-layer neural network. The results indicate a great potential of using an artificial neural network in determining the predicted values of natural leather properties. 10.18149/MPM.4742021_9 natural fiber-porous composites prediction neural networks ultimate strain stress https://mpm.spbstu.ru/article/2021.83.9/ 9-Kunelbayev-et-al.pdf

RAR RUS 621-632 Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

University of Sidi Bel Abbes Mazari

Sidi Bel Abbes, Algeria

Mechanical Research Center Constantine, University campus of châaberssas Brahami

Constantine, Algeria

Thermo-mechanical behavior of the bead weld of high-density polyethylene (HDPE) pipes The present paper has made it possible to highlight the thermo-mechanical behavior of the bead weld by the butt fusion welding process of two high-density polyethylene (HDPE) pipes. We proposed a welding technic for assembly two plastic pipes to see the effect of fluid pressure and the stress distribution during the welding process at the bead weld. To answer this objective, we wrote a finite element program named D-flux in Fortran95 language then we implemented the (For) files within the finite element code. The numerical simulation by Finite element makes it possible to evaluate the relevance of the proposed approach and validate the accepted hypotheses for this welding process. This numerical simulation of the thermal cycles of welding was conducted to evaluate the impact of welding on bead weld behavior. 10.18149/MPM.4742021_10 thermo-mechanical bead weld butt fusion simulation high-density polyethylene (HDPE) pipes residual stress https://mpm.spbstu.ru/article/2021.83.10/ 10-A_Belaziz%2C-M_Mazari.pdf

RAR RUS 633-638 Institute of Problems of Mechanical Engineering RAS Bobylev S.V.

St.Petersburg, Russia

Migration of nonequilibrium grain boundaries in metal-graphene composites with ultrafine-grained matrix We propose a theoretical model describing stress-induced migration of nonequilibrium grain boundaries constrained by the presence of second phase inclusions in metal-graphene composites with the ultrafine-grained matrix. Within the framework of the model, the structure of nonequilibrium boundaries is represented as a combination of dislocation structure of equilibrium boundary and dislocations introduced from outside, trapped by the boundary during deformation. Using the disclination theory approach, a change in the energy of the system associated with such migration under the action of applied shear stress was found. It is theoretically shown that the presence of inclusions leads to the strengthening of the material and the suppression of grain growth. 10.18149/MPM.4742021_11 metal-graphene composites ultrafine-grained materials nonequilibrium grain boundaries grain boundary migration disclinations https://mpm.spbstu.ru/article/2021.83.11/ 11-S_V_-Bobylev(2).pdf

RAR RUS 639-649 Airlangga University Ady

Surabaya, Indonesia

Airlangga University Meliana

Surabaya, Indonesia

Airlangga University Umroati

Surabaya, Indonesia

Airlangga University Ariska

Surabaya, Indonesia

Airlangga University Rudyardjo

Surabaya, Indonesia

Airlangga University Siswanto

Surabaya, Indonesia

National Cheng Kung University Nurpratiwi

Tainan City, Taiwan

Preparation and structural characterization of β – TCP/PVA nanopowders The research of β-Tricalcium phosphate (β-TCP) nanopowders without and with polyvinyl alcohol (PVA) effect have been prepared by the sol-gel technique. The crystallography characteristic has been confirmed by revealed the relevant parameter for 0.0 wt%, 1.0 wt%, 2.0 wt%, and 4.0 wt% of PVA while conducted at 800 oC. Where its values are determined from the parameter of the crystallite size, crystallite strain, crystallite dislocation, crystallinity, and the preferential plane crystallographic using the XRD result. Whilst the morphology is confirmed by the surface topography image and the atomic ratio of Ca/P using the SEM-EDX result. Eventually, its thermal response is confirmed by the melting point, specific heat capacity, fusion, and crystallization enthalpies parameters, using the DSCTG using. 10.18149/MPM.4742021_12 research tricalcium phosphate sol-gel polyvinyl alcohol nanopowder crystallography https://mpm.spbstu.ru/article/2021.83.12/ 12-J_Ady-et-al.pdf

RAR RUS 650-656 National University of Oil and Gas «Gubkin University» Gusev

Moscow, Russia

National University of Oil and Gas «Gubkin University» Elagina

Moscow, Russia

National University of Oil and Gas «Gubkin University» Volkov

Moscow, Russia

National University of Oil and Gas «Gubkin University» Buryakin

Moscow, Russia

Properties of 13% chromium wire electric arc spraying coatings The article considers the nature and some mechanical properties of corrosionresistant metallizing steel coatings produced out of 13% chromium wires. The carbon is confirmed to influence on the phase composition, hardness, adhesion strength of the coating to the substrate, elasticity module and bending strength of the coating material. The authors estimated a relative wear resistance of sprayed coatings under abrasive friction. They showed the data on the adhesion strength and elasticity module of the coating depending on the carbon content in the 13% Chr wires. The difference in the adhesion strength of the coatings can be explained by quenching processes during spraying and the variability of the elastic module of the applied material. 10.18149/MPM.4742021_13 electric arc spraying phase composition wear resistance microhardness porosity adhesion spraying https://mpm.spbstu.ru/article/2021.83.13/ 13-V_M_-Gusev-et-al.pdf

RAR RUS 657-664 University of Zanjan Mirmahdi

Zanjan, Iran

University of Zanjan Afshari

Zanjan, Iran

Detection of a new method for corrosion defects in turbine impeller blades by non-destructive testing The turbine impeller is a separate component that forms an important part of a turbine. These blades are used to extract energy and play a very important and key role in a turbine. The evaluation of the blades can be evaluated by non-destructive tests depending on their shape and dimensions, and the ability to detect the amount of corrosion in these blades is the main discussion of this article, which was accurately measured by ultrasonic testing method. This defect Due to its high performance in turbines in the oil and water industry, it will be an interesting challenge to test it for non-destructive testing. Corrosion diameter is personalized by ultrasound, which is a new method in this test. An experimental test was performed for turbines with defective blades selected from 100 blades with corrosion defects. 20 blades with more corrosion were selected. Defect signal size and defect size are simulated by Comsol software. According to various tests on the size of the corrosion defect diameter, the approximate life and operating hours of each turbine can be largely determined. The relationship between corrosion defect and its hourly function has a direct relationship and a direct effect on it. 10.18149/MPM.4742021_14 turbine impeller blades non-destructive testing ultrasonic testing corrosion defect simulation https://mpm.spbstu.ru/article/2021.83.14/ 14-Esmaeil-Mirmahdi%2C-Davood-Afshari.pdf