Materials physics and mechanics

REV RUS 1-10 Guru Nanak Dev University Singh

India

GLA University Dwivedi

Mathura, India

Dr. Ram Manohar Lohia Avadh University Agarwal

Faizabad, India

Optimizing processing parameters for semi-solid casting: a comprehensive review Semi-solid processing has gained popularity in the casting industry due to its significant advantages, offering a net shape single or multistep flexible process. This study aims to establish an evaluation criterion to understand the relationship between processability and its impact on outcomes. Pouring temperature and fluidity emerge as primary factors, while solidification and viscosity demonstrate secondary importance in the processing. Through a multi-angle evaluatory approach, the flexibility of all semi-solid casting process parameters can be assessed based on alloying elements, temperature gradient, fluidity, heat transfer, and solidification. 10.18149/MPM.5222024_1 semi-solid casting pouring temperature solidification temperature gradient MMC https://mpm.spbstu.ru/article/2024.101.1/ 1-Singh-Devendra-Pratap.pdf

RAR RUS 11-29 Peter the Great St. Petersburg Polytechnic University Borovkov A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Maslov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zhmaylo

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Tarasenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nezhinskaya

St. Petersburg, Russia

Finite element analysis of elastic properties of metamaterials based on triply periodic minimal surfaces The paper considers models of porous structures based on triply periodic minimal surfaces, which are an example of additively produced metamaterials of a new topological class. A numerical technology for the construction of metamaterial periodicity cell based on surface structures is developed, which ensures the periodic boundary conditions fulfilment on finite element meshes. The elastic properties of metamaterials have been calculated by the method of direct numerical homogenization at the periodicity cell meso-level. The dependences of the effective properties on the volume fraction of the metamaterial solid phase are revealed and it is noted that their proper description requires an orthotropic material model. It is shown that the considered types of metamaterials demonstrate strongly nonlinear dependence of elastic properties on the relative density or volume fraction of the solid phase of the metamaterial. The curvature of the curve is more pronounced for values of relative density less than 50 %, which may indicate a pronounced influence of the topological characteristics of the cell on the behaviour of the metamaterial at the meso-level. When analysing the Poisson’s ratios, a significant variation in their behaviour for different types of metamaterials is observed. The reason for this phenomenon may be the more pronounced influence of the unit cell topology on the transverse deformations. The consequence of this phenomenon is the apparent existence of stationary points corresponding to the maximum or minimum achievable values of the Poisson’s ratio, which can be useful in problems where its value has a significant influence on the global result. 10.18149/MPM.5222024_2 Metamaterials porous structures finite element analysis homogenization periodic cell elastic moduli https://mpm.spbstu.ru/article/2024.101.2/ 2-Borovkov-et-.pdf

RAR RUS 30-37 Maharishi Markandeshwar University Mittal

Mullana, India

Maharishi Markandeshwar University Choudhary

Mullana, India

Maharishi Markandeshwar University Sehrawat

Mullana, India

Maharishi Markandeshwar University Dhawan

Mullana, India

Maharishi Markandeshwar University Singh

Mullana, India

Effect on annealing on the micro-structural behavior of spray deposited Al-6Si-10Pb alloys In the present work, the microstructural features of spray deposited Al-6Si-10Pb alloys before and after annealing at different locations of the preform have been compared with each other. XRD confirms the presence of all elements present in the Al-6Si-10Pb alloy. The optical micrographs were taken at three different regions of the preform before and after annealing predicts that the grain size is lower at the peripheral region as compared to central region. Equiaxed grain structure was observed in SEM images, with a uniform distribution of Pb and Si phase in an Al-matrix. Further, grain refinement and reduction of porosity was observed after annealing. 10.18149/MPM.5222024_3 Al-alloys microstructure spray deposition annealing https://mpm.spbstu.ru/article/2024.101.3/ 3-Mittal%2C-et-al.pdf

RAR RUS 38-48 B.N. College of Engineering and Technology Mehdi

Lucknow, India

B.N. College of Engineering and Technology Dixit

Lucknow, India

Dr. Ram Manohar Lohia Avadh University Agarwal

Faizabad, India

Effect of extrusion ratio on the grain refinement and properties of copper prepared by powder metallurgy route The present study emphasizes determining the optimum value of the extrusion ratio for superior microstructure and mechanical properties of copper via the synergistic effect of powder metallurgy and extrusion process. In this study, sintered Cu is hot extruded for different extrusion ratios, from 2.8 to 11.1. During extrusion treatment, copper experiences high compressive and shear stress, which enhances the nucleation rate and recrystallization. It also breaks the oxide precipitates into tiny pieces with uniform dispersion. Experimental evaluation of the extruded copper pallets analyzes the effect of extrusion ratio on compressive stress, density, micro-indentation hardness, and electrical conductivity for extruded copper components. These properties show a combined effect of grain refinement and compaction as a function and potential candidate for extrusion ratio. The impact of grain refinement as a function of extrusion ratio and compressive deformation is analyzed according to microstructural analysis and different phase identification. 10.18149/MPM.5222024_4 Copper hot extrusion powder metallurgy microstructure metallurgical properties https://mpm.spbstu.ru/article/2024.101.4/ 4-A-Mehdi%2C-M-Dixit%2C-M-Agarwal.pdf

RAR RUS 49-55 St. Petersburg State University Ostropiko

St. Petersburg, Russia

Saint Petersburg State University Konstantinov

St.Petersburg, Russia

Martensite stabilization effect after high strain rate loading The behavior of shape memory alloys depends on the deformation technique and strain rate. This paper aims to demonstrate the martensite stabilization effect in equiatomic NiTi shape memory alloy after high strain rate loading. The high strain rate deformation at different rates and temperatures was performed using the Kolsky method modified for tension. Quasistatic deformation tests were conducted on a universal testing machine at identical temperatures up to the same residual strains. After tests, the samples were heated through reverse martensitic transformation temperature range in a thermomechanical analyzer with a temperature measurement accuracy of 0.3 °C. It is shown that the martensite stabilization effect depends on the loading rate in martensitic, premartensitic, and mixed phase states. An increase in the loading rate in the martensitic state results in a greater stabilization effect. High strain rate loading in the premartensitic and mixed-phase states does not lead to martensite stabilization, unlike in the quasi-static case. The results are consistent with the those of other authors and can be explained by hypotheses referenced in the paper. 10.18149/MPM.5222024_5 shape memory alloys nickel titanium martensite stabilization effect high-strain rate loading https://mpm.spbstu.ru/article/2024.101.5/ 5-Ostropiko.pdf

RAR RUS 56-63 Immanuil Kant Baltic Federal University Zherebtsov

Kaliningrad, Russia

Immanuil Kant Baltic Federal University Savin

Kaliningrad, Russia

Immanuil Kant Baltic Federal University Savina

Kaliningrad, Russia

Prokhorov General Physics Institute of the Russian Academy of Sciences Osadchy

Moscow, Russia

Formation and stability of β-Si3N4 and Si2N2O phases in composite materials during mechanochemical treatment of powder mixtures including silicon, Taunite-M and nitrogen-containing components Scientific research and exploratory work on the creation of new technologies are continuing, the purpose of which is to increase the level of mechanical and high temperature properties of materials. A multicomponent carbon composite material (MCСM) containing silicon nitride and oxynitride was synthesized by the method of sequential stepwise high-energy mechanochemical treatment (MCТ) and isothermal annealing at 1100 °C of powder mixtures of Taunite-M, silicon, g-C3N4 phase and melamine. Using X-ray diffraction analysis, IR spectroscopy and Raman spectroscopy, it was proved that β-Si3N4 and Si2N2O phases are present in the MCСM. Their crystallographic characteristics and crystal lattice parameters were determined. A crystal chemical explanation of the formation and stability of these phases in the realized synthesis is proposed. The synthesized МССМ is a promising material for high-temperature heat-resistant ceramics. 10.18149/MPM.5222024_6 subcritical growth multicomponent carbon composite material IR spectroscopy Raman spectroscopy X-ray diffractometry silicon nitride silicon oxynitride https://mpm.spbstu.ru/article/2024.101.6/ 6-Zherebtsov.pdf

RAR RUS 64-75 Peter the Great St. Petersburg Polytechnic University Maniakin

St. Petersburg, Russia

Glass and Ceramics, LTD Shalagaev

St. Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Archakov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Konakov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kurapova

St.Petersburg, Russia

Institute Silicate Chemistry of Russian Academy of Science Konakov V.G.

St.Petersburg, Russia

In-situ high-temperature bending strength measurement of YSZ ceramics manufactured using novel B2O3-based glass binder Stabilized zirconia ceramics are in high demand for various high temperature applications as fuel cells, oxygen sensors or protective barriers in aircraft. The use of additive manufacturing with polymeric binders do not allow the application of manufactured zirconia ceramics units at high temperature. The present research highlights the manufacturing of cubic yttria stabilized zirconia (YSZ) using Co3O4-doped MgO-BaO-B2O3 glass as a novel high-temperature binder. In order to produce ceramics, YSZ powder with 4 wt. % of glass binder was milled in a planetary mill, compacted using isostatic cold pressing and annealed at 1500 °C for 2 hours. Sol-gel co-precipitated YSZ powder with average particle size of 290 nm was used as a precursor. The structure of ceramics was investigated via HR-SEM, EDS, XRD, hydrostatic weighting. In situ 3-point bending strength measurement showed that the ultimate bending strength is 104 ±10 MPa at room temperature. Temperature increase induces the linear decrease of bending strength value. Fractography tests revealed that the glass binder plays a key role in the mechanical behavior of the ceramics. The ways to improve the mechanical behavior of ceramics are suggested. 10.18149/MPM.5222024_7 yttria stabilized zirconia bending strength glass binder high temperature ceramics in-situ measurements https://mpm.spbstu.ru/article/2024.101.7/ 7-P-Maniakin.pdf

RAR RUS 76-81 ITMO University Losin

St. Petersburg, Russia

ITMO University Babkina

St. Petersburg, Russia

ITMO University Kharisova

St. Petersburg, Russia

ITMO University Zyryanova

St. Petersburg, Russia

ITMO University Dolgopolov

St. Petersburg, Russia

ITMO University Sergeev M.M.

St. Petersburg, Russia

Effect of femtosecond irradiation on the luminescence of CsPbI3 perovskite crystals in borogermanate glass The article demonstrates femtosecond-laser-induced crystallization of CsPbI3 perovskite nanocrystals in borogermanate glass with no additional heat treatment. With an increase in the laser radiation power, the mean size of the precipitated crystals increases, which leads to the luminescence redshift from 660 up to 700 nm and its width decrease from 60 down to 35 nm. An increase in the mean size of CsPbI3 nanocrystals is also accompanied by an increase in the size of the laser exposure modified region. The appearance of CsPbI3 after irradiation with without additional heat treatment indicates the prospects for using this material for the repeated optical information recording. 10.18149/MPM.5222024_8 сesium lead iodide perovskite borogermanate glass femtosecond irradiation laser-induced crystallization https://mpm.spbstu.ru/article/2024.101.8/ 8-Losin%2C-Babkina.pdf

RAR RUS 82-89 Peter the Great St. Petersburg Polytechnic University Krasnitckii S.A.

St.Petersburg, Russia

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

St.Petersburg, Russia

0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

Brittle vs ductile fracture behavior in ceramic materials at elevated temperature An intergranular crack initiated at a pore located in a triple junction of grain boundaries in a ceramic material is considered in order to investigate the brittle versus ductile fracture in different temperature ranges. The critical fracture stress and critical dislocation slip stress are estimated in dependence on temperature for the case of Al2О3 ceramics. The temperature dependless local stresses in vicinity of blunt cracks and a triangular-shaped pore are calculated by the finite element method. The provided analysis reveals the favorability of the fracture scenarios upon the temperature conditions and bluntness of a crack tip as well. 10.18149/MPM.5222024_9 ceramic materials pore crack intergranular fracture dislocation emission finite element simulation https://mpm.spbstu.ru/article/2024.101.9/ 9-Krasnitckii%2C-et-al.pdf

RAR RUS 90-105 0000-0002-3339-8153 MBM University Kumari Emarti

Jodhpur, India

Rajasthan Technical University Lal

Kota, India

Studies of trapezoidal panels under thermo-mechanical load: a nonlinear dynamic analysis Large amplitude flexural and vibration behavior of trapezoidal panels with sixteen node degenerated shell element are studied under thermo-mechanical load. The finite element formulation has been done considering the first-order shear deformation theory with incorporation of Von Karman’s geometric nonlinearity, and the governing equations are solved using energy and conservation time integration scheme (combination of trapezoidal and three-point Euler backward method). The efficacy of the method is checked for nonlinear static and dynamic responses of both trapezoidal plate and curved panel. The effect of cord to span ratio (c/a), radius to span ratio (R/a), boundary conditions and stacking sequence on the nonlinear dynamic response of trapezoidal panels are also investigated under thermo-mechanical load. Moreover, new results for nonlinear dynamic response of trapezoidal panels under step thermal load with and without radial pressure are also presented and that will be important outcomes for the scientific community. 10.18149/MPM.5222024_10 trapezoidal panels finite element method laminated composite thermo-mechanical nonlinear dynamic https://mpm.spbstu.ru/article/2024.101.10/ 10-Kumari-Emarti.pdf

RAR RUS 106-113 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Polytechnic Institute of North-Eastern Federal University Sitnikov

Mirny, Russia

Polytechnic Institute of North-Eastern Federal University Yakovlev V.I.

Mirny, Russia

Polzunov Altai State Technical University Filimonov

Barnaul, Russia

Altai State Technical University Novoselova

Barnaul, Russia

Study of the melting nanocrystalline aluminum by the molecular dynamics method Using molecular dynamics simulation, a study of the melting of aluminum with a nanocrystalline structure obtained as a result of severe plastic deformation was conducted. It is shown that the melting of nanocrystalline aluminum begins at a lower temperature than monocrystalline aluminum. The higher the density of grain boundaries and other defects, and, accordingly, the higher the excess energy, the lower the melting temperature. In the presence of defects, melting proceeds heterogeneously and begins primarily from the grain boundaries and free surface. In a pure crystal that did not contain any defects or free surface, melting in the model proceeded homogeneously. When studying recrystallization in nanocrystalline aluminum, it was found that its intensity is greatly influenced by the free surface: the restructuring of the structure near it occurred faster than in the bulk of the material. 10.18149/MPM.5222024_11 molecular dynamics melting nanocrystalline structure recrystallization https://mpm.spbstu.ru/article/2024.101.11/ 11-Poletaev.pdf

RAR RUS 114-122 St. Petersburg State University Shuvalov

St.Petersburg, Russia

St. Petersburg State University Kostyrko

St.Petersburg, Russia

Stability analysis of solid morphology incorporating surface elasticity and surface tension This paper is primarily focused on exploring the morphological instability conditions inherent in nanostructured solid surfaces. Employing the constitutive equations of Gurtin–Murdoch model, we examine how surface elasticity and surface tension exert their influence on surface relief formation. Within this framework, we posit that the surface instability of the solid surface is instigated by surface diffusion processes propelled by the nuanced interplay of surface and bulk energy across the undulated surface. To distinguish the strain field along the undulated surface, we navigate the solution space of the plane elasticity problem, accounting for plane strain conditions. Our investigation tracks the linearized evolution of the surface, capturing the change in the amplitude of surface perturbations with time. Thus, the presented linear stability analysis sheds light on the precise conditions that initiate the early-stage increase in surface relief amplitude. This nuanced exploration provides not only a theoretical foundation, but also practical insights into the intricate mechanisms governing the morphological stability of nanostructured solid surfaces. 10.18149/MPM.5222024_12 morphological stability surface elasticity surface diffusion plane strain https://mpm.spbstu.ru/article/2024.101.12/ 12-Shuvalov-GM%2C-Kostyrko-SA.pdf

RAR RUS 123-132 Kh.M. Berbekov Kabardino-Balkarian State University Shabaev

Nalchik, Russia

Kh.M. Berbekov Kabardino-Balkarian State University Shakhmurzova

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Zhansitov

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Slonov

Nalchik, Russia

Tula State University Fomicheva

Tula, Russia

Kh.M. Berbekov Kabardino-Balkarian State University Dolbin

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Khashirova

Nalchik, Russia

Thermal transformation and mechanical properties of high-temperature-resistant matrix based polyetherketones Of the entire variety of polyaryletherketones, the most promising representatives of this class of polymers with high thermal and mechanical properties (polyether ether ketone, polyether ketone ketone) were studied in this work. The dependence of the rate of thermal decomposition on the structure was revealed, and the temperature-time ranges for the onset of gas evolution were shown. The order of destruction of the main polymer chain depending on temperature has been established. Due to the complexity of processing this class of polymers into products, the possibilities of changing the temperatures of phase transitions were shown in order to improve the technological conditions of processing without loss of performance characteristics. Comparative studies of the kinetics of the release of the main gaseous degradation products for polyether ether ketones from various manufacturers were carried out. The influence of hydrogen formed during the destruction process on the rate of decomposition of polymers is shown, and the dependences of the formation of carbon oxide and carbon dioxide on the structure and manufacturer of polymer materials are revealed. It has been established that polyether ether ketone has slightly higher mechanical properties compared to polyether ketone ketone, which is associated with the lower crystallinity of the latter due to the content of a comonomer with an irregular structure - isophthaloyl chloride. 10.18149/MPM.5222024_13 polyether ether ketone synthesis processing heat resistance mechanical properties https://mpm.spbstu.ru/article/2024.101.13/ 13-A_S_-Shabaev%2C-et.pdf

RAR RUS 133-141 0000-0002-1069-2413 Ogarev Mordovia State University Avdonin

Saransk, Russia

Vyatka State University Tarasova

Kirov, Russia

0000-0003-4310-3379 Vyatka State University Yurkin

Kirov, Russia

Effect of plasticizers of different polarity on dynamic mechanical properties of butyl rubber The article presents the results of studies of the influence of the concentration of three types of plasticizers with different percentages on the dynamic mechanical properties of mixtures based on elastomer: butyl rubber (BR) / industrial oil, BR/chlorinated paraffin, BR/dioctyl phthalate. Plasticizers were taken in a ratio of 20 to 40% by volume. The leading research methods were a comparative analysis of the temperature-frequency dependence of the loss tangent and the elastic modulus, obtained by the method of dynamic mechanical analysis (DMA). The developed compositions of the composite material were tested by IR spectroscopy. It has been established that in order to obtain self-adhesive composite materials with high damping properties, a plasticizer-industrial oil with a minimum content of 40 % should be used. Based on the conducted studies, it was proved that when plasticizers of various types and polarities are introduced into butyl rubber, the properties of the compositions change depending on the concentration of the plasticizer, the molecular structure and the forces of intermolecular interaction. It was revealed by infrared spectroscopy that no chemical interaction occurs in the polymer matrix of butyl rubber, on the grounds that the influence of the components on the intensity or magnitude of the peak is not traced. 10.18149/MPM.5222024_14 elastic modulus mechanical loss tan δ temperature butyl rubber (BR) plasticizers industrial oil (IO) chlorinated paraffin (CP) dioctyl phthalate (DOP) https://mpm.spbstu.ru/article/2024.101.14/ 14-Avdonin.pdf

RAR RUS 142-150 0000-0002-0448-7624 Ioffe Institute Kharitonskii

St. Petersburg, Russia

St. Petersburg Electrotechnical University "LETI" Setrov

St. Petersburg, Russia

Far Eastern Federal University Ralin

Vladivostok, Russia

Modeling of hysteresis characteristics of a dilute magnetic with dipole-dipole interaction of particles A modification of the method for calculating the distribution function of random fields of dipole-dipole interaction in dilute magnetics using the expansion in the Gram-Charlier series with the help of Bell polynomials has been carried out. On the basis of this method, a model has been developed that allows us to estimate the ensemble magnetisation, the volume fractions of particles in different magnetic states, the volume concentration of the ferrimagnetic and its effective spontaneous magnetisations on the basis of experimental data on hysteresis characteristics. The proposed approach allows us to take into account the particle size distribution and magnetic states. The model has several advantages, such as the possibility of taking into account the cluster distribution of particles and applicability to the limiting cases of thin layer and thin filament. Examples of partial verification of this model on objects of artificial and natural origin are given. 10.18149/MPM.5222024_15 dilute magnetic random fields of dipole-dipole interaction method of moments magnetization coercivity lognormal distribution magnetic states effective spontaneous magnetization https://mpm.spbstu.ru/article/2024.101.15/ 15-PV-Kharitonskii-et-al.pdf