Materials physics and mechanics

RAR RUS 1-12 Saint Petersburg State University Selyutina Nina

St.Petersburg, Russia

K-4577-2013 57384230400 St.Petersburg State University Petrov Yuri y.v.petrov@spbu.ru

St.Petersburg, Russia

United model for low-cycle, high-cycle and giga-cycle fatigue life prediction The methods for determining the cyclic strengths of metals under low-cycle and high-cycle fatigue are different, since the mechanisms of failure and the extent of the presence or absence of plastic deformation differ for each type of fatigue. The aim of this study is to develop united models for both low-cycle and high-cycle fatigue life prediction. We propose that the relevant relaxation and damage processes are considered and it on different types of metals is tested. In this paper, the cyclic deformation of materials is considered using the proposed model with regard to two processes: stress relaxation and damage accumulation kinetics. Proposed approach allows us to study the united fatigue curves of materials regardless of the chosen type of fatigue (low-cycle fatigue, high-cycle fatigue, giga-cycle fatigue). Fatigue life curves under staircase strain loading and symmetrical sinusoidal strain/stress loading are predicted in this study. A simple numerical scheme for the model is successfully applied to various materials under various types of loading, since the relaxation–kinetic model is phenomenological in nature. 10.18149/MPM.5322025_1 fatigue strength metals inelastic adaptability fatigue life curve short-term strength long-term strength https://mpm.spbstu.ru/article/2025.107.1/ 1_selyutina.pdf

RAR RUS 13-24 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Polzunov Altai State Technical University Bebikhov Yuriy V.

Barnaul, Russia

Polzunov Altai State Technical University Semenov Alexander S.

Barnaul, Russia

Influence of grain size of nanocrystalline titanium on its dissolution intensity in aluminum Using molecular dynamics simulations, this study investigates the influence of grain size of nanocrystalline titanium on its dissolution intensity in aluminum at various temperatures, compared to the dissolution of monocrystalline titanium. It is shown that the grain size in nanocrystalline titanium significantly affects the intensity of mutual dissolution of the components. This is explained by the fact that grain boundaries act as channels for accelerated diffusion, and as the average grain size decreases, the density of grain boundaries increases. In the case of grains on the order of several nanometers, the density of grain boundaries and the contribution of grain boundary diffusion are relatively high. For example, at a temperature of 800 K, which is significantly below the melting point of aluminum, dissolution in the model occurred more intensely for grain sizes smaller than 9 nm than for monocrystalline titanium at 1100 K ‒ this temperature is not only 300 K higher but also corresponds to liquid aluminum. Thus, the nanocrystalline structure and high density of grain boundaries in titanium may be one of the reasons, alongside the energy stored in defects due to deformation, for the reduction in activation energy for the synthesis reaction in the Ti‒Al system following mechanical processing of the initial mixture. 10.18149/MPM.5322025_2 molecular dynamics titanium intermetallide diffusion grain boundary https://mpm.spbstu.ru/article/2025.107.2/ 2_poletaev_et_al.pdf

RAR RUS 25-39 Ufa University of Science and Technology Medvedev Andrey E.

Ufa, Russia

Ufa University of Science and Technology Zhukova Olga O.

Ufa, Russia

Ufa University of Science and Technology Shaikhulova Aygul F.

Ufa, Russia

Ufa University of Science and Technology Medvedev Evgenii B.

Ufa, Russia

Siberian Federal University Motkov Mikhail M.

Krasnoyarsk, Russia

Ufa State Aviation Technical University Murashkin Maxim Yu.

Ufa, Russia

Electromagnetically cast Al-0.5 wt. % Fe alloy as a core material for the co-extruded copper-clad aluminium wire In this study, the electromagnetically cast Al-0.5 wt. % Fe alloy was used as a core material for the copper-clad aluminium wire with the copper grade M2 outer sleeve. The choice of core material decreased the risk of premature copper-clad aluminium wire failure due to higher, compared to pure Al, mechanical strength and thermal stability. The mechanical bonding of the bimetallic wire was conducted via joint cold drawing. The produced copper-clad aluminium wire with the 37 % copper fraction in the cross-section is characterized by good adhesion of the Al and Cu layers. No intermetallic particles were observed on the Al-Cu interface in neither hard-drawn nor annealed state. Hard-drawn copper-clad aluminium wire is characterized by high mechanical strength and electrical conductivity while possessing an acceptable level of ductility. Subsequent to cold drawing annealing at 300 °C for 1h led to decrease of yield strength and ultimate tensile strength, as well as to increase in ductility and electrical conductivity. However, in both hard-drawn and annealed states copper-clad aluminium wire is characterized by the properties that lay within and even exceed the values recommended by international standards. Evaluation of the copper-clad aluminium wire ultimate tensile strength according to the rule of mixtures showed the importance of surface preparation on all the stages of the wire production. 10.18149/MPM.5322025_3 copper-clad aluminium hybrid materials CCAW electromagnetic crystallization mechanical strength electrical conductivity ductility rule of mixtures https://mpm.spbstu.ru/article/2025.107.3/ 3_medvedev_ae_et_al.pdf

RAR RUS 40-47 Belarusian State University of Informatics and Radioelectronics Boiprav Olga V.

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Belousova Elena S.

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Mokerov Vyacheslav S.

Minsk, Republic of Belarus

S11 and S21 characteristics of carbon fiber fabric fixed in the polyurethane based matrixes The aim of the research presented in the paper was the establishment of the regularities of change of electromagnetic radiation reflection (S11) and transmission (S21) characteristics values in the frequency range 2.0 – 17.0 GHz of carbon fiber fabric fixed in the polyurethane mastic based matrices depending on these matrixes composition. Such research is urgent due to the following reasons: (1) carbon fiber materials are characterized low stability of S11 and S21 characteristics due to their hydroscopicity; (2) to increase stability of S11 and S21 characteristics and strength of carbon fiber materials it’s necessary to perform their additional processing (for example, to fix them in matrices or substrates). It’s demonstrated in the paper that values of S11 characteristics in the frequency range 2.0 – 17.0 GHz of carbon fiber fabric fixed in the matrix from polyurethane without fillers are from –0.1 till –3.5 dB. S11 characteristic values in the frequency range 2.0 – 17.0 GHz of carbon fiber fabric fixed in the matrix from polyurethane with aluminum oxide, titanium oxide and zinc oxide fillers are from –0.1 till –11.0 dB, from –0.1 till –3.0 dB, from –0.1 till –5.0 dB respectively. S21 characteristic values in the frequency range 2.0 – 17.0 Hz of the listed materials are from –20.0 till –40.0 dB. The studied materials are suitable for use for making special boxes for storing equipment sensitive to microwave interference. 10.18149/MPM.5322025_4 electromagnetic radiation carbon fiber fabric microwave absorber polyurethane matrix S11 characteristic S21 characteristic https://mpm.spbstu.ru/article/2025.107.4/ 4_boiprav_ov_et_al.pdf

RAR RUS 48-54 Peter the Great St. Petersburg Polytechnic University Tonkov Dmitriy

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kobylyatskaya Maria

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Vasilyeva E.S.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Gasumyants Vitaliy

St. Petersburg, Russia

Conductive and mechanical properties of graphene-filled polymer composites The conductive and mechanical properties of polymer composites based on styrene-butadiene rubber with different concentrations of graphene as a filler are studied. Based on the dependence of the resistivity of composites on the graphene content, the range of its values corresponding to the hopping conductivity mechanism was determined. For composites of compositions from this range, the sensitivity of the resistance to the degree of uniaxial stretching, as well as mechanical properties were investigated. The values of the gauge factor were determined, and it was found that with an increase in graphene content in the composite, its value first increases and then decreases. It is found that even under minimal stresses in composites, along with elastic deformations, plastic deformations also develop, and the proportion of the latter increases with the filler concentration. As a result, complete mechanical relaxation of the composites does not occur after the applied stress is removed. 10.18149/MPM.5322025_5 polymer composite materials styrene-butadiene rubber graphene resistivity gauge factor deformations https://mpm.spbstu.ru/article/2025.107.5/ 5_tonkov.pdf

RAR RUS 55-63 ITMO University Zhang Xi.

St. Petersburg, Russia

ITMO University Panov Dmitrii

St.Petersburg, Russia

ITMO University Spiridonov Vladislav

St.Petersburg, Russia

ITMO University Kuzmenko Natalia

St. Petersburg, Russia

ITMO University Prasolov Nikita

St. Petersburg, Russia

ITMO University Ivanov Andrey

St. Petersburg, Russia

Togliatti State University Dorogov Maksim

Togliatti, Russia

School of Materials Science and Engineering, Changchun University of Science and Technology Wei Haoming

Changchun, China

School of Materials Science and Engineering, Changchun University of Science and Technology Jiang. Dayong

Changchun, China

ITMO University Bauman Dmitrii

St.Petersburg, Russia

F-1445-2014 7202768874 0000-0003-3738-408X ITMO University Romanov Alexey alexey.romanov@niuitmo.ru

St.Petersburg, Russia

Effects of post-annealing duration on the properties of β-Ga2O3 thin films prepared by spray pyrolysis The post-annealing duration dependence of structural and optical properties of polycrystalline β-Ga2O3 thin films fabricated on sapphire (Al2O3) substrate via the spray pyrolysis method are presented. Extending the annealing time for fixed temperature 900 °C from 1 to 2 h improves crystallinity of the films, as evidenced by an increase in the average grain size approximately from 8 to 14 nm, a reduction in the full width at half maximum of the β-Ga2O3 diffraction peak from 0.43 to 0.29°. However, extending the post-annealing duration to 3 h induces excessive grain coarsening into island-like crystalline domains. These findings demonstrate that for the chosen experimental conditions, a 2-hour annealing at 900 °C represents an optimum for achieving relatively smooth and solid β-Ga2O3 films while balancing crystallinity and film homogeneity. 10.18149/MPM.5322025_6 Ga2O3 film spray pyrolysis sol-gel post-anneal duration https://mpm.spbstu.ru/article/2025.107.6/ 6_zhang.pdf

RAR RUS 64-82 55632460600 University of Houston Sharma Saurav

Houston, Texas, USA

59115044600 Kurukshetra University Devi Sangeeta

Kurukshetra, Haryana, India

59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

Fundamental theorems and variational criterion in modified couple stress under multi-phase-lags and rotation Present study involves a new mathematical formulation of modified couple stress thermoelastic diffusion under multi-phase-lags model in rotating frame of reference. The governing equations for multi-phase-lags model in rotating frame of reference are obtained with the aid of modified Fourier’s and Fick’s laws and used to explore the energy, uniqueness, reciprocity theorems and variational criterion. Instantaneous concentrated body forces, heat and chemical potential sources along with moving heat and chemical potential sources are taken to illustrate the applications of the reciprocity theorem for a specific case. It has been observed that results obtained are dominated by the physical field. Some well-known results are also explored as special cases. The multi-phase-lags and rotation in modified couple stress material makes it more realistic as all the field quantities depend upon information from surrounding at a particular point. Physical views presented in this article may be useful for the design (composition, arrangement, device, etc.) new material, geophysics and other scientific domains. Also, the study has tremendous applications in material science, geomechanics, soil dynamics and electronic industry. 10.18149/MPM.5322025_7 modified couple stress thermoelastic diffusion multi-phase-lags rotating frame of reference energy theorem uniqueness reciprocity theorem variation criterion https://mpm.spbstu.ru/article/2025.107.7/ 7_kumar_r_et_al.pdf

RAR RUS 83-103 0000-0001-6255-2300 University of Science and Technology of Oran, Mohamed Boudiaf Derraz Hanaa

El Mnaouar, Oran, Algeria

34975131400 0000-0002-1417-7291 University of Science and Technology of Oran, Mohamed Boudiaf Bouzit Mohamed

El Mnaouar, Oran, Algeria

0000-0002-6126-0434 University of Science and Technology of Oran, Mohamed Boudiaf Bencherif Atika

El Mnaouar, Oran, Algeria

Modelling forced convection and magneto-elastic interactions in a downward conduit using ferrofluid An unsteady numerical investigation of fluid-structure interaction in forced magnetohydrodynamic convection of a ferrofluid within a downward step configuration, aiming to analyze its influence on flow dynamics and heat transfer mechanisms is presented. The research explicitly incorporates the deformation of an elastic top wall under the combined effects of hydrodynamic, magnetic, and thermal forces. This approach enhances the understanding of the interplay between wall deformation and forced convection under dynamic magnetic fields, an aspect rarely addressed in existing literature. The study examines the impact of key physical parameters, including the Reynolds number (100 ≤ Re ≤ 200), Hartmann number (0 ≤ Ha ≤ 50), Cauchy number (10⁻⁷ ≤ Ca ≤ 10⁻³), magnetic field inclination angle (0°≤g≤60°), and nanoparticle volume fraction (0 % ≤ φ ≤ 8 %) on flow structure, heat transfer, and wall deformation. The numerical modeling is based on the arbitrary Lagrangian-Eulerian formulation, solving the coupled Navier-Stokes, energy, and structural displacement equations using the finite element method. The results reveal that increasing the Reynolds number enhances thermal agitation and vortex formation, leading to improved heat transfer, while a decrease in the Cauchy number amplifies these effects. Conversely, a higher Hartmann number strengthens Lorentz forces, suppressing flow motion and stabilizing the thermal boundary layer. Furthermore, the inclination angle of the magnetic field significantly influences wall deformation, altering the interaction between the ferrofluid and the elastic boundary. 10.18149/MPM.5322025_8 forced convection magnetic fields elasticity heat transfer Hartmann number MHD FSI https://mpm.spbstu.ru/article/2025.107.8/ 8_derraz_h_et_al.pdf

RAR RUS 104-112 7005667416 0000-0003-4054-5550 Tver State Technical University Bolotov Aleksandr

Tver, Russia

9241293300 0000-0003-4133-3541 Tver State Technical University Novikova Olga

Tver, Russia

57192912799 0000-0001-5670-1250 Tver State Technical University Novikov Vladislav

Tver, Russia

Effect of loading on tribotechnical characteristics of antifriction diamond-bearing mineral ceramics A calculation and experimental analysis of tribotechnical properties of a pair of materials diamond-bearing mineral ceramics – ceramics in a wide range of loads are shown. The molecular-mechanical theory of friction was used for the analysis. It also accepted a linear-elastic nature of microroughness contact after running in in a steady-state mode. A criterion that determines the change in deformation behavior is the load which creates an average elastic pressure on a contact spot equal to material microstrength. Using both theoretical and experimental approaches, we determined the critical nominal pressure and friction coefficient depending on physical and mechanical constants of materials and friction surface profile parameters. 10.18149/MPM.5322025_9 diamond-bearing ceramics antifriction properties contact interaction model microstrength friction wear https://mpm.spbstu.ru/article/2025.107.9/ 9_bolotov.pdf

RAR RUS 113-122 14071323800 0000-0002-1098-4096 Tver State Technical University Brovman Tatyana

Tver, Russia

Elastic-plastic deformation when bending rotating workpieces A method of calculating plastic deformation during bending a rotating circular beam is presented. Rotating blank loading is examined in the two cases: plastic deformation occurs over the thickness of the blank and plastic deformation is absent in the blank. When the pipe being bent rotates, the symmetry with respect to the force plane is broken. The nature of bending deformation of a rotating blank differs from that of a fixed one. Since the beam axis is not a plane but a space curve, there is a lateral displacement and deviation of the deflection from the force plane. 10.18149/MPM.5322025_10 plastic deformation acceleration limits strain rate tensor https://mpm.spbstu.ru/article/2025.107.10/ 10_brovman_tv.pdf

RAR RUS 123-141 59082476300 0000-0003-1885-2431 Maharishi Markandeshwar (Deemed to be University) Kumar Dinesh

Mullana, Ambala, India

Chandigarh Engineering College Singh Sarabjeet

Punjab, India

57196084084 0000-0003-3522-3207 Parul Institute of Engineering and Technology Karsh Pardeep Kumar

Parul University, Vadodara, India

0000-0002-3810-7829 Panjab University SSG Regional Centre Hoshiarpur Chauhan Abhishek

Punjab, India

0000-0001-6254-0764 Panjab University SSG Regional Centre Hoshiarpur Saini Gaurav

Punjab, India

57205493369 0000-0002-7741-0214 Deenbandhu Chhotu Ram University of Science and Technology Chouksey Arti

Haryana, India

57209130166 0000-0001-6310-0621 Maharishi Markandeshwar (Deemed to be University) Kumar Pardeep

Mullana, Ambala, India

AI-driven modeling and prediction of mechanical properties of additively manufactured Al-6061/B4C composite This study investigates the effects of friction stir processing on the mechanical and damping properties of Al-6061 aluminum alloy, reinforced with boron carbide (B4C) nanoparticles. A CNC milling machine was used to conduct friction stir processing, varying key processing parameters such as rotational speed, feed rate, and the number of passes. The mechanical properties analyzed include ultimate tensile strength, yield strength, natural frequency, and damping ratio. An advanced machine learning approach was implemented using a long short-term memory model optimized with the sine cosine algorithm to predict the processed material’s attributes. The experimental findings demonstrate that friction stir processing significantly enhances damping characteristics due to grain refinement, with the highest damping efficiency observed at 1400 rpm. Higher rotational speeds resulted in a notable increase in yield strength, attributed to finer grain structures. The introduction of B4C nanoparticles further improved damping properties. Additionally, the study found that an increased number of friction stir processing passes decreased shear modulus and natural frequency while increasing the loss factor and damping ratio. The developed machine learning model achieved high predictive accuracy, with R² values of 0.981 for the ultimate tensile strength, 0.991 for YS, 0.973 for natural frequency, and 0.995 for damping ratio. The special relativity search-optimized long short-term memory model outperformed other approaches, attaining R² values ranging from 0.961 to 0.998 during training and 0.919 to 0.992 during testing. These findings highlight the effectiveness of friction stir processing in enhancing material properties and the superior predictive capability of machine learning models in capturing the effects of processing parameters. 10.18149/MPM.5322025_11 FSP CNC Al-6061 microstructural evolution material toughness deformation desistance LSTME optimization techniques SRS https://mpm.spbstu.ru/article/2025.107.11/ 11_d_kumar_et_al.pdf

RAR RUS 142-148 6504466259 0000-0002-7977-5823 Yuri Gagarin State Technical University or Saratov Tseluikin Vitaly

Saratov, Russian Federation

57223034289 0000-0002-6360-6929 Yuri Gagarin State Technical University or Saratov Dzhumieva Asel

Saratov, Russian Federation

57710834700 0009-0005-9723-6128 Yuri Gagarin State Technical University or Saratov Tribis Alena

Saratov, Russian Federation

24077445300 0000-0001-6180-0712 Yuri Gagarin State Technical University or Saratov Tikhonov Denis

Saratov, Russian Federation

Electrochemical crystallization and functional properties of nickel-based composite coatings The electrochemical crystallization of nickel/graphene oxide composite electrochemical coatings was researched by the chronovoltamperometry method. The microstructure of the composite electrochemical coatings was studied by scanning electron microscopy and X-ray diffraction analysis. The microhardness and corrosion rate of nickel/graphene oxide composite electrochemical coatings obtained at different cathode current densities were measured. It was revealed that in the presence of a dispersed phase of multilayer graphene oxide, the rate of the cathode process increases. Based on scanning electron microscopy and X-ray diffraction data, it was found that the dispersed phase affects the crystal structure of the nickel matrix. In the presence of graphene oxide, the nickel deposit is formed uniform and fine-grained. It was found that the microhardness of the nickel/graphene oxide composite electrochemical coatings increases ~ 1.20 times compared with pure nickel. This is a consequence of the formation of fine crystalline deposits with long grain boundaries, which prevents the movement of dislocations and plastic deformation of the crystal lattice. Tests in 3.5% NaCl showed that the inclusion of graphene oxide particles in the composition of electrolytic nickel deposits leads to a decrease in their corrosion rate by 1.35–1.60 times. This effect is due to the fact that graphene oxide particles ensure a uniform distribution of corrosion currents over the coating surface, and in the structure of composite electrochemical coatings, the dispersed phase forms compounds that are more corrosion resistant than the metal matrix. 10.18149/MPM.5322025_12 electrochemical composition coatings nickel graphene oxide microhardness corrosion https://mpm.spbstu.ru/article/2025.107.12/ 12_tseluikin_et_al.pdf

RAR RUS 149-156 56416470100 0000-0001-9506-862X National Research University "‎Moscow Power Engineering Institute" Kachalin Gennadiy

Moscow, Russia

National Research University "‎Moscow Power Engineering Institute" Medvedev Konstantin

Moscow, Russia

56449354300 0000-0001-9544-9086 National Research University "Moscow Power Engineering Institute" Tkhabisimov Alexander

Moscow, Russia

National Research University "‎Moscow Power Engineering Institute" Iliukhin Dmitriy

Moscow, Russia

The effect of the magnetron discharge power on the deposition rate of chrome coating obtained by spattering an uncooled extended target The effect of the magnetron discharge power in the range from 2.2 to 8.2 kW on the deposition rate of chrome coatings obtained by spraying an uncooled and cooled planar extended target is studied. The coatings were applied to 12Cr18Ni10Ti stainless steel samples with temperature control using a chromel-copel thermocouple. It is shown that the deposition rate of coatings for an uncooled chrome target increases non-linearly with an increase in power of more than 6.5 kW, and at a power of 8.2 kW reaches 45 µm/h, which is more than 2 times higher than for a cooled target. The results obtained indicate the prospects of using such extended magnetron systems to solve a number of applied problems in the energy sector, in particular, the formation of thermal barrier coatings on the domestic gas turbine blades. 10.18149/MPM.5322025_13 magnetron sputtering cooled target uncooled target deposition rate chrome coating discharge power https://mpm.spbstu.ru/article/2025.107.13/ 13_kachalin_et_al_.pdf

RAR RUS 157-167 57214871657 0000-0002-2249-350X National Research Center "‎Kurchatov Institute"‎, Konstantinov Petersburg Nuclear Physics Institute–Grebenshchikov Institute of Silicate Chemistry Balabanov Sergey

St. Petersburg, Russia

National Research Center "‎Kurchatov Institute"‎, Konstantinov Petersburg Nuclear Physics Institute–Grebenshchikov Institute of Silicate Chemistry Kuropiatnik Artur

St. Petersburg, Russia

8670312900 0000-0001-9736-6452 National Research Center "‎Kurchatov Institute"‎, Konstantinov Petersburg Nuclear Physics Institute–Grebenshchikov Institute of Silicate Chemistry Sychov Maksim

St. Petersburg, Russia

St. Petersburg State Institute of Technology Pavlova Emiliya

St. Petersburg, Russia

57189342050 0000-0002-1243-555X National Research Center "‎Kurchatov Institute"‎, Konstantinov Petersburg Nuclear Physics Institute–Grebenshchikov Institute of Silicate Chemistry Diachenko Semen

St. Petersburg, Russia

Gradient energy-absorbing nature-inspired metamaterial based on the "‎Schwarz Primitive"‎ geometry Gradient energy-absorbing nature-inspired cellular metamaterial with high energy-absorbing properties has been developed, made from polyamide-12 using selective laser sintering technology. It is shown that the gradient structure provides the effect of "‎pseudo-plastic failure"‎ due to layer-by-layer deformation of the metamaterial with a significant increase in the energy absorption value, which was 1.88 MJ/m3 for the plastic series, and 1.45 MJ/m3 for the brittle series. 10.18149/MPM.5322025_14 cellular materials triply periodic minimal surfaces additive technologies 3D printing strength deformation selective laser sintering pseudo-plastic failure gradient cellular structures https://mpm.spbstu.ru/article/2025.107.14/ 14_balabanov_et_al.pdf