Materials physics and mechanics

RAR RUS 1-8 Institute of Problems of Mechanical Engineering RAS Bobylev S.V.

St.Petersburg, Russia

113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

Crack bridging in ceramic-based nanocomposites reinforced with hybrid graphene/alumina nanofibers A model is proposed describing the effect of crack bridging on the fracture toughness of ceramic-based nanocomposites reinforced with hybrid graphene/alumina nanofibers. Within the model, a mode I crack propagates normally to a system of aligned inclusions, whose pullout from the ceramic matrix in the wake of the crack toughens the composite. The dependences of the fracture toughness on the graphene content and the sizes of the inclusions are calculated in the exemplary case of yttria stabilized zirconia based composites. The calculations predict that if crack bridging is the dominant mechanism during crack growth, the maximum toughening can be achieved in the case of long nanofibers provided that the latter do not rupture and adhere well to the matrix. The model shows good correlation with the experimental data at low graphene concentrations. 10.18149/MPM.5132023_1 fracture toughness crack bridging graphene nanofibers yttria stabilized zirconia https://mpm.spbstu.ru/article/2023.95.1/ 1-Bobylev-SV%2C-Sheinerman-AG.pdf

RAR RUS 9-19 Saint Petersburg State University E.G. Zemtsova

St.Petersburg, Russia

Saint Petersburg State University Smirnov

St.Petersburg, Russia

St. Petersburg State University Kozlova

St. Petersburg, Russia

St.Petersburg State University Morozov

St.Petersburg, Russia

Saint Petersburg State University Yurchuk

St.Petersburg, Russia

Institute for Problems of Mechanical Engineering of the RAS Semenov

St.Petersburg, Russia

7005573911 St.Petersburg State University Morozov N.F.

St.Petersburg, Russia

Development of aluminum-based composite with two reinforcing modifiers (TiC/Ni, CNTs/Ni) with improved mechanical properties The main direction in obtaining metal-matrix composites (MMCs) with a multilevel hierarchical structure is the development of new approaches to the creation of materials with two or more reinforcing modifiers, which makes it possible to improve a whole range of functional properties and, at the same time, reduce the total cost of the material. Carbon nanotubes and carbide particles additives can significantly improve the strength properties of aluminum and its alloys. In this work, the possibility of directed control of the composition, the structure and properties of composites was shown, using the methods of powder metallurgy and surface modification. As a result of the study, aluminum-based MMCs reinforced with carbide nanoparticles and carbon nanotubes (CNTs) with a Ni-plated surface were synthesized. As a result, it was shown that the combined use of two reinforcing phases makes it possible to diminish their negative qualities in the bulk of the metal and obtain a composite material with high strength properties while maintaining plasticity. 10.18149/MPM.5132023_2 composite materials carbon nanotubes ceramic nanoparticles aluminum mechanical properties https://mpm.spbstu.ru/article/2023.95.2/ 2-E-Zemtsova.pdf

RAR RUS 20-28 Saint Petersburg State University Evstifeev

St.Petersburg, Russia

St.-Petersburg State University Smirnov

St.Petersburg, Russia

Effect of annealing and additional deformation on the microstructure and mechanical properties of ultrafine-grained Al5083 alloy The microstructure and mechanical properties of ultrafine-grained (UFG) aluminum alloy Al5083 in different structural states were investigated. The UFG structure was formed by high-pressure torsion (HPT) technique. The UFG alloy exhibits high value of ultimate tensile strength (~ 725 MPa) but no ductility. Short-term annealing at 473 K and additional deformation by HPT to 0.25 of revolution at room temperature resulted in a slight decrease in material’s strength to ~ 653 MPa, which was ∼ 90 % of the value after HPT processing but provided ductility ∼ 2 %. Microstructure evolution during deformation heat treatment was investigated by transmission electron microscopy and X-ray diffraction analysis. Physical mechanisms to improve plasticity in correlation with microstructure evolution is discussed. 10.18149/MPM.5132023_3 aluminum-magnesium alloys severe plastic deformation strength ductility microstructure ultrafine-grained structure https://mpm.spbstu.ru/article/2023.95.3/ 3-A_D_-Evstifeev%2C-I_V_-Smirnov.pdf

RAR RUS 29-37 Presidency University Srivastava

Karnataka, India

Presidency University Shaikh

Karnataka, India

Presidency University Bopanna

Karnataka, India

Microstructural characterization of SiC reinforced Ti−6Al−4V metal matrix composites fabricated through powder metallurgy route Titanium alloy specifically Ti−6Al−4V is largely used in aerospace industry owing to its high specific strength and stiffness. Further improvement in the specific strength and stiffness of the alloy can be achieved by reinforcing it with hard ceramic material like SiC. In the present investigation, different proportion of SiC particles (0, 1.5, 3 and 4.5 %) was introduced into the Ti−6Al−4V alloy to fabricate the metal matrix composite. The MMC’s were prepared through powder metallurgy route which involves mechanical alloying of different powder in the predefined proportion followed by compaction and sintering in the furnace. The microstructure of fabricated composite was analyzed using scanning electron microscope. Uniform distribution of SiC particles in the titanium matrix is observed due to better wettability between the reinforcement and the matrix. The bulk hardness of the MMC’s was measured on Rockwell Hardness (C scale). The x-ray diffraction analysis and EDX spectroscopy is also performed to capture the phase transformation after the sintering. The result shows that with the increase in the mass fraction of the SiC in the MMC’s, a continuous increase in the hardness is observed. A 13.15 % increase in hardness is observed with 1.5 % addition of SiC in base Ti alloy. However, this percentage increase is increased to 26 % with addition of 4.5 % of SiC in the matrix. The increase in the hardness is due to higher hardness of reinforced SiC. SEM micrograph shows the uniform distribution of reinforced particle into the matrix. 10.18149/MPM.5132023_4 Powder metallurgy Ti-6Al-4V Composite SiC Scanning electron microscope https://mpm.spbstu.ru/article/2023.95.4/ 4-Ashish-Srivastava-.pdf

RAR RUS 38-45 Ioffe Institute Blokhin

St.Petersburg, Russia

Ioffe Institute Levin

St. Petersburg, Russia

Ioffe Institute Epoletov

Saint Petersburg, Russia

Ioffe Institute Kuzmenkov

St. Petersburg, Russia

Ioffe Institute Blokhin

St.Petersburg, Russia

Ioffe Institute Bobrov

St. Petersburg, Russia

Ioffe Institute Kovach

Saint Petersburg, Russia

Ioffe Institute Maleev

Saint Petersburg, Russia

Connector Optics LLC Andryushkin

St. Petersburg, Russia

Submicron Heterostructures for Microelectronics Research and Engineering Center, Russian Academy of Sciences (RAS) Vasil’ev

Saint Petersburg, Russia

JSC OKB-Planeta Voropaev

Veliky Novgorod, Russia

Ioffe Institute Ustinov V.M.

St.Petersburg, Russia

Zn diffusion from vapor phase into InGaAs/InP heterostructure using diethylzinc as a p-dopant source The zinc diffusion process into InP through a thin InGaAs layer using diethylzinc (DEZn) as a p-dopant source was investigated. The distribution profiles of electrically active dopant in InGaAs/InP heterostructures were obtained by electrochemical capacitance-voltage profiling technique. The influence of temperature and pressure in the reactor, DEZn flow rate and process time on the concentration of holes and the diffusion depth was investigated. The process of zinc diffusion strongly depends on the zinc concentration at the surface, however, the maximum concentration of holes and the depth of zinc diffusion into the InP layer might be chosen independently in a certain range of values. 10.18149/MPM.5132023_5 Zink diffusion diethylzinc indium phosphide https://mpm.spbstu.ru/article/2023.95.5/ 5-S_A_-Blokhin%2C-et-al-.pdf

RAR RUS 46-51 Ioffe Institute Zarichny

Saint Petersburg, Russia

Ioffe Institute Butenko

St.Petersburg, Russia

Ioffe Institute Boiko

St.Petersburg, Russia

Ioffe Institute Sharkov

St.Petersburg, Russia

Ioffe Institute Nikolaev

St.Petersburg, Russia

The analysis of the etch pits parameters in the (-201) plane of the β-Ga2O3 substrate crystals Selective wet etching technique was applied to commercial (-201) β-Ga2O3 single crystal substrates. Some etching recipes allowed us to reveal sharp etch pits on the surface of the substrates. The geometric shape, orientation and density of etch pits were investigated in as-delivered specimens. An observation of mutual location of the etch pits indicates the likely formation low-angle grain boundaries that can form upon heating. Selective wet etching technique was applied to commercial (-201) β-Ga2O3 single crystal substrates. Some etching recipes allowed us to reveal sharp etch pits on the surface of the substrates. The geometric shape, orientation and density of etch pits were investigated in as-delivered specimens. An observation of mutual location of the etch pits indicates the likely formation low-angle grain boundaries that can form upon heating. 10.18149/MPM.5132023_6 selective wet etching β-Ga2O3 gallium oxide semiconductor crystal substrate low-angle grain boundaries https://mpm.spbstu.ru/article/2023.95.6/ 6-A_A_-Zarichny.pdf

RAR RUS 52-58 Far Eastern Federal University Lyubimova

Vladivostok, Russia

Far Eastern Federal University Barbotko

Vladivostok, Russia

Far Eastern Federal University Streltcov

Vladivostok, Russia

Experimental investigations of varying the temperature parameters in the glass-transition range for glass-metal composites when heated The article is concerned with the preliminary experimental investigation of varying the linear extension of glass in composition of the glass-metal composite on basis of steel 20 (st20) and glass S52-1 when heated to transition temperature from the solid state to the high viscous one. The characteristic temperatures of glass-transition (Tg) and softening (Tf) and the glass transition from the solid state to the high viscous one (∆Tg) were determined. In order to determine the basic parameters in the approximated model of the coefficient of linear thermal expansion, the linear rate of variation was fixed in the vicinity of the glass-transition temperature and softening temperature. The simulation was based on the Williams-Landel-Ferry relation and Sanditov’s model of delocalized atoms. The statistical processing of results was carried out using small samples, and the experimental investigation of changing the temperature parameters under conditions of varying the rate of heating was planned. 10.18149/MPM.5132023_7 glass-transition temperature thermal expansion coefficient glass-metal composite https://mpm.spbstu.ru/article/2023.95.7/ 7-O_N_-Lyubimova%2C-M_A_-Barbotko%2C-A_A_-Streltcov.pdf

RAR RUS 59-65 Peter the Great St. Petersburg Polytechnic University Samigullin

Saint Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Mikhailov

Saint Petersburg, Russia

JSC "Research and Production Corporation S.I. Vavilova" Belykh

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Semencha

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krylov

Saint Petersburg, Russia

Reproducibility of properties of AsxSe1-x glasses on the synthesis temperature AsxSe1-x glasses with x from 0.05 to 0.55 were prepared at two melting temperatures, 700 and 850 oC. Batch materials from several suppliers were used for glass synthesis. Density and IR transmittance of glasses were measured. It was found that data for density of glasses prepared at 700 oC have sufficient scatter, so dependence of molar volume on composition is not smooth. Data for glasses synthesized at 850 oC are in good agreement with reference ones. According to data of IR spectroscopy, the main defects in glasses are oxide impurities in several molecular forms. Oxygen gets in glass together with arsenic. Its content can be noticeably decreased by the heat treatment of As before weighting and by the heat treatment of batch at 200 oC before the sealing of silica ampoule. Optical quality of glass samples is good enough for the use of them as IR transparent material for lens manufacturing. 10.18149/MPM.5132023_8 chalcogenide glasses arsenic selenium oxygen impurity density IR transparency optical homogeneity https://mpm.spbstu.ru/article/2023.95.8/ 8-M_E_-Samigullin%2C-et-al.pdf

RAR RUS 66-74 Henan University of Technology Liu

Zhengzhou, China

Henan University of Technology Hou

Zhengzhou, China

Henan University of Technology Wang

Zhengzhou, China

Influences of multi-walled carbon nanotubes incorporated into poly(methyl methacrylate-co-acrylic acid)/polyethylene glycol In this article, by ultrasonic-assisted dispersion of poly(ethylene glycol) (PEG) and multiwalled carbon nanotubes (MWCNTs), methyl methacrylate (MMA) and acrylic acid (AA) are copolymerized and crosslinked through in situ radical bulk polymerization, namely fabricating P(MMA-co-AA)/PEG/MWCNTs composites. The influences of MWCNTs contents in morphology, thermal and mechanical properties of the composites are investigated. After treated by mixed acid, MWCNTs can be uniformly dispersed in P(MMA-co-AA)/PEG due to the hydrogen bonding. Compared with P(MMA-co-AA)/PEG, both the glass transition temperature and the degradation temperature of the composites increase with increasing content, and increase at least 7 and 13 °C, respectively; their tensile strength and impact strength at least increase 9 and 65 %, respectively, and the elongation at break is reduced by at least 8 %. 10.18149/MPM.5132023_9 composites thermal and mechanical properties storage modulus https://mpm.spbstu.ru/article/2023.95.9/ 9-G_Q_-Liu%2C-et-al.pdf

RAR RUS 75-87 Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation Grinevich

Moscow, Russia

Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation Buznik

Moscow, Russia

Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation Nyzhnyi

Moscow, Russia

Numerical simulation of ice fracture by compression using of the discrete element method The article provides numerical simulation of ice fracture by compression using of the discrete element method by the software Yade. The Bonded Particle Model with damage was used. The computational calibration of the material parameters was performed on the test model of the sample in the form of a hyperboloid, the difference in strength by tensile and compression was 3.26 times. A comparison of real and computational tests on compression of cylindrical samples with diameter and height 50 mm at a temperature of -10 °С was carried out. The deformation curves are similar in the general character, reactions level, and deformations. The method makes it possible to simulate the ice fracture. According to the estimation of the deformation work, the difference between the typical experimental curve and the calculated is about 2 %. 10.18149/MPM.5132023_10 ice fracture damage discrete element method bonded particle model https://mpm.spbstu.ru/article/2023.95.10/ 10-D_V_-Grinevich%2C-V_M_-Buznik%2C-G_A_-Nyzhnyi.pdf

RAR RUS 88-104 Southern Federal University Soloviev

Rostov-on-Don, Russia

Southern Federal University Chebanenko

Rostov-on-Don, Russia

Applied theory of bending of a functional-gradient bimorph This paper presents a study of the stress-strain state and distribution of the electric field in a functionally gradient bimorph piezoelectric plate during its cylindrical bending. It is assumed that the layers are made of porous ceramics, the volume fraction of porosity of which varies so that its effective properties have a quadratic dependence over the plate thickness. Based on the Hamilton principle, extended to the theory of electroelasticity, a system of differential equations and boundary conditions was obtained, in which the distribution of the electric potential over the thickness of the layers is considered quadratic, and it is taken as the unknown variable in the middle of the piezoactive layer. The results of a numerical experiment based on the obtained system of equations were compared with the data of finite element modeling. 10.18149/MPM.5132023_11 electroelasticity plate bending vibrations functionally graded piezoelectric material porous ceramics electric potential https://mpm.spbstu.ru/article/2023.95.11/ 11-A_N_-Soloviev%2C-V_A_-Chebanenko.pdf

RAR RUS 105-114 University Djillali Liabes Mebarki

Sidi Bel Abbes, Algeria

University Djillali Liabes Benguediab

Sidi Bel Abbes, Algeria

University Djillali Liabes Fekirini

Sidi Bel Abbes, Algeria

University Djillali Liabes Bouchouicha

Sidi Bel Abbes, Algeria

Aix-Marseille University Lebon

Marseille, France

Fracture toughness characterization of aluminum allay AA3003 using essential work of fracture concept Lightening structures is one of the main challenges of the aviation industry today. Friction stir welding is an alternative to replace conventional assembly processes and reduce the mass of the structure. The mechanical behavior of this assembly must be determined to understand the failure mechanisms. The concept of fracture mechanics is often used to characterize the fracture of thin sheets. In this document, a global energy approach proposed to characterize the phenomenon of rupture and to determine experimentally the essential work of fracture in Aluminum Alloy welded by Friction Stir Welding process. The tests were carried out on DENT specimens welded by the process of friction stir welded and not welded specimens. The results obtained show that the not welded sheets show that the strength of the specimens welded by FSW has a low tear resistance compared to the welded specimens. 10.18149/MPM.5132023_12 Aluminum alloy Fracture Toughness DENT specimen essential work of fracture EWF Friction Stir Welding https://mpm.spbstu.ru/article/2023.95.12/ 12-H_-Mebarki-et-al.pdf

RAR RUS 115-125 Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

Mechanics Research Center (CRM) Bouamama M.

Constantine, Algeria

Mechanics Research Center (CRM) Elmeguenni

Constantine, Algeria

University of Djilali Bounaama-Khamis Meliana Zahaf

Théniet El had, Algeria

Experimental study of the roughness variation of friction stir welding FSW The use of the Friction Stir Welding (FSW) process in aircraft construction, naval or nuclear reduces manufacturing costs and indirectly, operating costs through structural lightening. The aluminum alloys have very interesting specific properties such as very good electrical and thermal conductivity, good ductility accompanied by good mechanical and corrosion resistance. It is for this reason that these alloys are used in many industrial sectors. The aluminum based alloys are difficult to melt weld due to their high thermal conductivity and oxidation rate at temperatures very close to that of melting. The purpose of this investigation is to study the variation of the surface roughness on the weld joint of 5 mm thick plates of AA6061-T6 using friction stir welding FSW and carried out using a simple form pin tool. Surface roughness of FSW joints as a function of welding parameters (rotational speed, welding speed). The surface roughness of FSW joints has a big impact on the fatigue of the welded joint, hence determining the minimum surface roughness is critical. The quality of an FSW joint is heavily influenced by the tool and welding settings. The tool's geometry affects both the heat distribution and the amount of metal entrained by the tool. This paper provides outcome of impact of welding parameters on microhardness, and surface roughness of friction stir welded AA6061- T6. Conclusions derived from this research work are: the FSW joint's microstructural examination reveals homogeneous particle distribution. 10.18149/MPM.5132023_13 FSW process Rotational speed Welding speed microscopic microhardness surface roughness https://mpm.spbstu.ru/article/2023.95.13/ 13-Azzeddine-Belaziz.pdf

RAR RUS 126-145 National Institute of Technology Kurukshetra Yadav A.

Kurukshetra, India

National Institute of Technology Kurukshetra Jain A.

Kurukshetra, India

National Institute of Technology Kurukshetra Verma R.

Kurukshetra, India

Effect of tilt angle for conical pin tool with a conical shoulder on heat transfer and material flow using numerical simulation in friction stir welding The weld quality is determined by the produced temperature and material flow along the cross-section of the workpiece. In this investigation, a computational fluid dynamics (CFD) model is employed to numerically simulate the heat transfer and material flow of Aluminum alloy AA6061. A conical pin tool with the conical shoulder (CPCS) at different tool tilt angles is considered for a lap joint. Temperature and velocity contours lines are used to study its gradient at different tool tilt angles. The result indicates that higher temperature is generated on trailing advancing side (AS), a high temperature gradient on leading side, and temperature decreases from top to bottom surface along the workpiece thickness. At transverse plane, temperature contour lines lean more towards the advancing side as tilt angle is increased. For CPCS tool, influence of tilt angle on velocity magnitude is negligible. Material from leading AS and front of the tool is observed to be swept along the retreating side (RS) and deposited at the rear of the tool. It is also observed that when tool tilt angle increases, streamlines tend to become more dispersed. It can be deduced that for CPCS, if the tilt angle of the tool is raised, the peak temperature will likewise increase, but the peak material velocity will remain the same. The outcomes of the current investigation are validated by comparison to previously published data. With the above findings and conclusions in mind, CPCS welders can better understand the impact of tool tilt angle on weld quality. 10.18149/MPM.5132023_14 Friction Stir Welding Computational Fluid Dynamics Fluent Finite Volume Method https://mpm.spbstu.ru/article/2023.95.14/ 14-Amit-Yadav%2C-Ajai-Jain%2C-Rajiv-Verma.pdf

RAR RUS 146-166 Tahri Mohammed University Benchekkour

Bechar, Algeria

Tahri Mohammed University Terfaya

Bechar, Algeria

Tahri Mohammed University Elmir

Bechar, Algeria

University Center Salhi Ahmed Kebir

Naama, Algeria

University Djillali Liabes Benguediab

Sidi Bel Abbes, Algeria

Modeling of delamination process coupling contact, friction, and adhesion considering the thermal effect The main objective of this work is based on a numerical study of delamination behavior between an elastic body and a rigid support, taking into account the thermal effect. A cohesive zone model (CZM) coupling friction and adhesion is used and implemented in the finite element software ABAQUS which allows to gives a smooth transition from total adhesion to the usual Coulomb friction law with unilateral contact, where adhesion is regarded as interface damage. Also, a sequentially coupled thermal stress model is performed to predict the thermomechanical behavior assuming a steady-state thermal analysis. The influence of the decohesion energy, the interface initial stiffnesses, and friction coefficient are analyzed. The results showed that the thermal effect is not negligible and can affect the delamination process in failure modes I and II. The proposed numerical model is in good agreement with the results compared to those obtained in the literature. 10.18149/MPM.5132023_15 delamination unilateral contact coulomb friction law cohesive zone model finite element method thermal effect https://mpm.spbstu.ru/article/2023.95.15/ 15-Abdellah-Benchekkour%2C-et-al-.pdf

RAR RUS 167-174 Polzunov Altai State Technical University Yankovskaya

Barnaul, Russia

Novokuznetsk Branch of the Kuzbass State Technical University Markidonov

Novokuznetsk, Russia

I.I. Polzunov Altai State Technical University Starostenkov

Barnaul, Russia

Institute for Metals Superplasticity Problems of RAS Korznikova

Ufa, Russia

Mechanical properties of CNT-reinforced Pt under compression: molecular dynamics simulation In this study, we investigate the elastic properties of a composite consisting of platinum (Pt) and carbon nanotubes (CNTs) under the influence of an external impact using molecular dynamics simulations. The main focus of our research is on compression, and we compare the results with those obtained for a pure Pt crystal, as well as with the stretching of the composite. We employ the Modified Embedded Atom Method (MEAM) potential to describe the interaction between all particles, and we calculate mechanical stresses using the virial stress method. Our findings demonstrate that the Young's modulus of the composite is higher than that of pure platinum. Additionally, we analyze the effect of the strain rate on the elastic modulus and show that it decreases with an increase in the strain rate. Furthermore, we investigate the influence of the strain rate on the phase changes that occur in the composite. Overall, our study provides valuable insights into the elastic behavior of the Pt-CNT composite under compression and contributes to the understanding of the material's mechanical properties. 10.18149/MPM.5132023_16 composite CNT compression deformation intense impact molecular dynamics https://mpm.spbstu.ru/article/2023.95.16/ 16-U_I_-Yankovskaya%2C-et-al.pdf