Materials physics and mechanics

REV RUS 1-34 0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

N-7717-2016 7005519053 0000-0003-4116-4821 Institute of Problems of Mechanical Engineering RAS Kolesnikova Anna anna.kolesnikova.physics@gmail.com

St. Petersburg, Russia

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

St.Petersburg, Russia

Institute for Problems in Mechanical Engineering, Russian Academy of Sciences Mikaelyan K.N.

St. Petersburg, Russia

Institute for Problems in Mechanical Engineering of the Russian Academy of Science Petrov

St. Petersburg, Russia

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

St.Petersburg, Russia

ITMO University Smirnov A.M.

St.Petersburg, Russia

Micromechanics of misfit stress relaxation in heterogeneous crystalline nanostructures: a review Theoretical models of misfit stress relaxation in heterogeneous crystalline nanostructures are reviewed in brief. It is shown that the main channel of relaxation is the formation of misfit dislocations. Some mathematical tools for continuum modeling of misfit stress relaxation through generation of discrete dislocations in spherical and cylindrical nanostructures are considered with special attention to the strain energies of the dislocations and the energies of elastic interaction between them. The critical conditions and energy barriers for the formation of prismatic dislocation loops and straight edge misfit dislocations in core-shell nanoparticles and nanowires with various types of cores, in Janus nanoparticles and nanowires, in axially inhomogeneous nanowires with transverse interfaces, and in free-standing composite nanolayers are discussed. 10.18149/MPM.5352025_1 misfit stress heterogeneous nanostructures stress relaxation misfit dislocations Janus nanoparticles Janus nanowires free-standing composite nanolayers dislocation loops core-shell nanoparticles core-shell nanowires https://mpm.spbstu.ru/article/2025.110.1/ 1_gutkin_et_al.pdf

RAR RUS 35-41 113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

A model for the temperature dependence of the fracture strength of ceramic matrix composites High fracture strength at elevated temperatures is a crucial characteristic of ceramic matrix composites for applications in extreme heat environments. Here we suggest a model that describes the temperature dependence of the fracture strength of particulate-reinforced ceramic matrix composites. Within the model, the variation of the fracture strength with temperature is given by the competition of the temperature dependences of the thermal stresses and cohesive strength of the matrix. It is demonstrated that the temperature dependence of the fracture strength can have a maximum if the coefficient of thermal expansion of the filler is significantly smaller than that of the matrix. The results of the model agree with experimental data and confirm that a small coefficient of thermal expansion difference between the matrix and the filler is beneficial for a high fracture strength of ceramic matrix composites. 10.18149/MPM.5352025_2 high-temperature ceramics ceramic matrix composites fracture strength thermal stresses https://mpm.spbstu.ru/article/2025.110.2/ 2_sheinerman.pdf

RAR RUS 42-49 ITMO University Nguyen Van Tuyen

St. Petersburg, Russia

N-7717-2016 7005519053 0000-0003-4116-4821 Institute of Problems of Mechanical Engineering RAS Kolesnikova Anna anna.kolesnikova.physics@gmail.com

St. Petersburg, Russia

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

St.Petersburg, Russia

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

St.Petersburg, Russia

Band gap engineering with strains induced by quantum dots in semiconductors nanowires This work examines the influence of quantum dots embedded in semiconductor nanowires with lattice parameters different from those of the surrounding nanowire material on the nanowire band gap. Using the found analytical formulas for the elastic fields of cylindrical, hemispherical, and conical inclusions simulating quantum dots and located along the nanowire symmetry axis, the maps of the elastic dilations are depicted and the regions of their extremes near the nanowire surface are identified. Calculations are performed within the framework of the isotropic linear theory of elasticity. For GaN nanowires containing axisymmetric quantum dots of varying shapes and compositions, the deformation potentials and corresponding changes in the band gap in the nanowire regions of elastic dilation extremes are calculated. The dependence of local change in the band gap in GaN nanowires on the lattice mismatch parameter between the quantum dots and NWs are presented. It is shown that the semiconductor nanowire band structure depends on the quantum dot shape, material, and size, and the band gap of GaN nanowires can locally vary by approximately 10 % of its tabulated value. The response of the band gap of a semiconductor nanowire to the elastic field of quantum dot embedded in this wire allows one to nanowire band gap engineering by varying the parameters of the quantum dot. 10.18149/MPM.5352025_3 semiconductor nanowire quantum dot elastic fields deformation potential band gap https://mpm.spbstu.ru/article/2025.110.3/ 3_nguyen_van_tuyen_et_al.pdf

RAR RUS 50-73 Peter the Great St. Petersburg Polytechnic University Maslov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Borovkov A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nezhinskaya

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

Strength characteristics of additively manufactured meta-biomaterials made of titanium alloy under cyclic loading The study considers the fatigue strength of additively manufactured specimens made of metamaterials based on Ti-6Al-4V titanium alloy. The study presents results of full-scale tests for two types of meta-biomaterials: lattice and surface. Dynamic tests were performed in a symmetrical tension-compression cycle at room temperature. The goal of the tests was to construct an S-N curve, which was used to determine the fatigue limit of the metamaterial. We found that the results of numerical simulation differ significantly from the full-scale tests, showing a trend toward overestimated fatigue life. The surface roughness parameter of the specimen was introduced, allowing to achieve better agreement between the results of full-scale tests and numerical simulations. 10.18149/MPM.5352025_4 metamaterial titanium alloy lattice structures surface structures fatigue strength finite element analysis https://mpm.spbstu.ru/article/2025.110.4/ 4_maslov_et_al.pdf

RAR RUS 74-82 Tomsk State University of Control Systems and Radioelectronics Mikhailov M.M.

Tomsk, Russia

Peter the Great St. Petersburg Polytechnic University Filimonov A.V.

St. Petersburg, Russia

Tomsk State University of Control Systems and Radioelectronics Lapin A.N.

Tomsk, Russia

Tomsk State University of Control Systems and Radioelectronics Yuryev S.A.

Tomsk, Russia

Tomsk State University of Control Systems and Radioelectronics Goronchko V.A.

Tomsk, Russia

Phedosov D.S. The design of Zn2SiO4 pigments for thermal control coatings Zn2SiO4 pigments were synthesized from ZnO and SiO2 powders obtained from different manufacturers at various concentration ratios and differing in particle size and specific surface area. The optimal values of particle size and specific surface area were determined, thus making it possible to obtain the pigments with a small value of solar absorptance (αs). The αs values of the synthesized pigments were compared with other types of pigments used to design thermal control coatings. The study showed that it is possible to synthesize Zn2SiO4 powders with high reflectivity in a wide spectral range (200–2500 nm) and a small value of solar absorptance (αs = 0.077) - significantly lower compared to ZnO powders - using a solid-state method from zinc oxide micropowders and silicon dioxide nanopowders. 10.18149/MPM.5352025_5 thermal control coatings pigments synthesis diffuse reflectance spectra solar absorptance https://mpm.spbstu.ru/article/2025.110.5/ 5_mikhailov_et_al.pdf

RAR RUS 83-89 Nakhon Phanom University Samran

Nakhon Phanom, Thailand

Trinity International School Timah

Bangkok, Thailand

Nakhon Phanom University Phatungthane T.

Nakhon Phanom, Thailand

Nakhon Phanom University Thongpanit

Nakhon Phanom, Thailand

Nakhon Phanom University Kadroon B.

Nakhon Phanom, Thailand

Kasetsart University Photharin S.

Sakonnakhon, Thailand

Rajamangala University of Technology Isan Sakonnakhon Campus Chaiwichian

Sakonnakhon, Thailand

Fabrication and characterization of zinc nitrate doped TiO2 nanotubes for dye-sensitized solar cells Zinc-doped titanium dioxide nanotubes were successfully synthesized, characterized, and tested as materials for energy conversion in dye-sensitized solar cells. The TiO2 nanotubes were grown through single-face anodization at a constant direct current voltage of 50 V and room temperature on titanium sheets with a thickness of 0.25 mm and purity of 99.7 %. The electrolyte was composed of ethylene glycol, ammonium fluoride (0.3 % wt. NH4F), and deionized water (2 % v/v H2O). The titania nanotubes were doped with Zn using Zn(NO3)2 as the dopant source. The molar ratios of zinc nitrate were varied from 1, 3, 5, and 7 mM. X-ray diffraction, scanning electron microscopy, and ultraviolet-visible spectroscopy (techniques were employed to characterize the Zn-doped titanium dioxide nanotubes. The samples were then tested in dye-sensitized solar cells, and their photoelectric conversion efficiencies were calculated. As a result, amorphous-TiO2 structure was transformed into the crystalline anatase phase after annealing. The best performance was observed for the 5 mM zinc nitrate sample, with a photoelectric conversion efficiency of 4.96 % and an energy band gap of 3.18 eV. The findings of this research provide valuable insights for ongoing and future studies in the development of renewable energy. 10.18149/MPM.5352025_6 renewable energy DSSCs TiO2 nanotubes https://mpm.spbstu.ru/article/2025.110.6/ 6_chaiwichian_s_et_al.pdf

RAR RUS 90-98 B.M.S. College of Engineering Saravanakumar G.

Bengaluru, Karnataka, India

B.M.S. College of Engineering Gomathi P.

Bengaluru, Karnataka, India

B.M.S. College of Engineering Bharathi V.

Bengaluru, Karnataka, India

B.M.S. College of Engineering Ravikumar L.

Bengaluru, Karnataka, India

B.M.S. College of Engineering Balakrishnan G.

Bengaluru, Karnataka, India

Microstructure and nanomechanical properties of TaN coating prepared by RF magnetron sputtering In this work, TaN is coated on the high-speed steel substrates at 500 °C using radio frequency magnetron sputtering and its microstructural and nanomechanical properties are examined. The structural, surface morphology and mechanical properties are analyzed by X-ray diffraction, atomic force microscopy and nanoindentation, respectively. X-ray diffraction studies indicated the presence of hexagonal Ta2N and cubic TaN phases at 5 sccm nitrogen flow at room temperature. It shows that the film prepared at 2 sccm and 500 °C revealed the strong intensity peak of FCC TaN phase, while the film prepared at 10 sccm and 500 °C showed that the broad peak demonstrating the nanocrystalline nature of the film. Atomic force microscopy analysis indicated the formation of crystallites of uniform size and homogeneous distribution. The surface roughness is ~ 2–6 nm in all the deposition conditions. The hardness of the TaN films has increased from 9.46 ± 1.15 to 30.05 ± 3.79 GPa with decreasing N2 flow rate from 10 to 2 sccm. The microstructure depends on the preparation technique, processing parameters and nitrogen content in the films. TaN coating on high speed steel increased the hardness resulting the increase of wear resistance of the tool, leads to increase of the tool life. 10.18149/MPM.5352025_7 tantalum nitride films high speed steel X-ray diffraction atomic force microscopy nanoindentation https://mpm.spbstu.ru/article/2025.110.7/ 7_saravanakumar_et_al.pdf

RAR RUS 99-107 Belarusian State University of Informatics and Radioelectronics Boiprav Olga V.

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Bogush

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Lobunov V.V.

Minsk, Republic of Belarus

Belarusian State Academy of Communications Soloviev V.V.

Minsk, Republic of Belarus

Microwave and infrared electromagnetic shields based on aluminum-containing polymer film The technology of development microwave and infrared electromagnetic shields based on double-layer metalized polymer film and synthetic non-woven fibrous material is proposed. This technology consists in heat pressing of the construction, which is two fragments of the said fibrous material, between which fragments of the said film are uniformly distributed. The characteristics of electromagnetic radiation absorption and reflection in the frequency range of 0.7–17.0 GHz of the shields samples of various types developed in correspondence with the proposed technology are presented. The sample of each type differed in the number of fragments of double-layer metalized polymer film included in their composition (namely, the ratio between the total area of surface areas covered with double-layer metalized polymer film fragments and the total area of surface areas not covered with such fragments). In addition, the results of assessing the change in temperature of the front and back surfaces of the shields samples of each type as a result of the impact of infrared electromagnetic radiation on the first of the said surfaces are presented. It was found that electromagnetic shields developed in correspondence with the proposed technology are multi-band electromagnetic radiation absorbers in the frequency range of 1.6–17.0 GHz, which is their key advantage over their analogues. Such shields could be used for selection in the rooms zones for standing equipment sensitive to the microwave and thermal noise. 10.18149/MPM.5352025_8 absorption aluminum-containing polymer film electromagnetic shield polyurethane matrix infrared range microwave range reflection https://mpm.spbstu.ru/article/2025.110.8/ 8_boiprav_ov_et_al.pdf

RAR RUS 108-121 University of Bonab Ghazani M.S.

Bonab, Iran

Sahand University of Technology Rezai H.A.

Tabriz, Iran

Work hardening behavior of AISI 321 austenitic stainless steel with different initial microstructures In the present investigation, different microstructures were obtained in AISI 321 austenitic stainless steel by cold rolling and subsequent annealing at different temperatures. The effect of initial microstructure on the work hardening behavior was analyzed using tensile analysis. At annealing temperatures of 700 and 800 °C, the stage I hardening is not apparent due to the high density of dislocations existed inside the austenite grains prior to tensile deformation. But the stage I hardening is seen in the ln(σ) ~ ln(ε) curves of the sample annealed at 900 °C and coarse grained one because the microstructures are consisted of equiaxed and dislocation free austenite grains. More detailed results were also obtained by differential Crussard-Jaoul analysis. This analysis indicated the occurrence of austenite to martensite transformation during tensile deformation of as received sample and that was annealed at 900 °C, which is distinguished by a positive slope in the ln(dσ/dε) vs. ln(ε) curves. 10.18149/MPM.5352025_9 AISI 321 stainless steel work hardening cold rolling annealing tensile deformation https://mpm.spbstu.ru/article/2025.110.9/ 9_ghazani_ha_rezai.pdf

RAR RUS 122-131 Pryazovskyi State Technical University Burlakov V.I.

Mariupol, Russia

Pryazovskyi State Technical University Burlakova G.Yu.

Mariupol, Russia

Peter the Great St. Petersburg Polytechnic University Artiukh V.G.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kitaeva D.A.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Korihin N.V.

St. Petersburg, Russia

Modeling of vibro-magnetic-abrasive finishing tools and analysis of their influence on the surface quality of cutting ceramics A model of a tool for machining cutting ceramics is proposed with an aim to provide a detailed analysis of its durability. The development of effective abrasive materials capable of operating under extreme conditions is discussed. The use of tools made from diamond-containing composite materials is necessitated by the exceptional hardness of diamonds. While many researchers have investigated finishing processes, the combination of vibrational and electromagnetic components to achieve a high-quality and productive lapping process for superhard ceramics has not been previously accomplished. The process of synthetic diamond manufacturing is described. 10.18149/MPM.5352025_10 superhard materials workpiece processing diamond-containing composite materials tool life high-performance workpiece processing wear process https://mpm.spbstu.ru/article/2025.110.10/ 10_burlakov_vi_et_al.pdf

RAR RUS 132-139 I.N. Ulyanov Chuvash State University Egorov E.N.

Cheboksary, Russia

I.N. Ulyanov Chuvash State University Kol’tsov

Cheboksary, Russia

Influence of dispersed inorganic fillers on the properties of vulcanized rubber based on ethylene propylene diene monomer rubber SKEPT-40 The influence of various powder inorganic fillers (carbon black P 803, P 324 and N 220, silica ZC-120) on the rheometric properties of the rubber compound, physico-mechanical and performance properties of vulcanized rubber based on ethylene propylene diene monomer rubber SKEPT-40, used for rubberizing metal surfaces, was studied. The rubber compound under study based on the above rubber included a vulcanizing agent (sulfur), vulcanization accelerators (2-mercaptobenzthiazole and tetramethylthiuram disulfide), vulcanization activators (zinc white and stearic acid) softener (industrial oil I-8A). It was found that vulcanized rubber with a content of 60.0 parts per hundred parts of rubber (phr) of carbon black N 220 has high physico-mechanical properties, the smallest changes in tensile strength, elongation at break and weight after exposure to aggressive acid-base environments and good frost resistance. 10.18149/MPM.5352025_11 carbon black P 803 P 324 and N 220 silica ZC-120 ethylene propylene diene monomer rubber SKEPT-40 vulcanized rubber rheometric physico-mechanical and performance properties https://mpm.spbstu.ru/article/2025.110.11/ 11_egorov_en_et_al.pdf

RAR RUS 140-149 St. Petersburg State University Selyutina

St.Petersburg, Russia

St. Petersburg State University Khairetdinova D.D.

St. Petersburg, Russia

Dynamic fracture of concretes with basalt and limestone aggregate at different temperatures The dynamic strength of concrete subjected to variable thermal and velocity conditions is examined, predicated on the incubation time criterion and the thermal fluctuation theory of strength. A salient feature of this criterion is the invariant characteristic time, serving as a quantification of the loading rate. Model validation is accomplished through a comparative analysis of predicted outcomes against empirical data obtained from concrete specimens incorporating basalt, gravel, and limestone aggregates. It is shown that the characteristic relaxation time of concretes increases within the temperature interval of 20 to 800 °C and decreases at temperatures above ~ 800 °C. The temperature dependence of the characteristic relaxation time for concrete with basalt, limestone and gravel aggregate, determining the intensity of the relaxation process, is predicted based on proposed model. 10.18149/MPM.5352025_12 dynamic strength characteristic time temperature strain rate activation energy https://mpm.spbstu.ru/article/2025.110.12/ 12_selutina_et_al.pdf

RAR RUS 150-163 0009-0004-2796-3170 Mien Tay Construction University Lam T.Q.K.

Vinh Long, Vietnam

0000-0002-5140-9725 Jyothy Institute of Technology, Visvesvaraya Technological University Sreekeshava K.S.

Belagavi, India

Bureau veritas Kumar S.

Bangalore, India

Jyothy Institute of Technology, Affiliated to Visveswaraya Technological University Bhargavi C.

Belagavi, India

Jyothy Institute of Technology, Affiliated to Visveswaraya Technological University Skanda Kumar B.N.

Belagavi, India

Jyothy Institute of Technology, Affiliated to Visveswaraya Technological University Gayathri G.

Belagavi, India

Jyothy Institute of Technology, Affiliated to Visveswaraya Technological University Suresh Y.R.

Belagavi, India

Structural response of reinforced, steel fiber reinforced and prestressed geopolymer concrete beams subjected to transverse loading The workability of the geopolymer concrete mixes was evaluated in accordance with prevailing code of practice. Furthermore, regression analysis was carried out to establish correlations among the strength properties. Fly ash was considered as the primary binder, activated with NaOH and Na2SiO3 solutions. The beam mixes were selected based on trial combinations that achieved the highest compressive strength of 41.63 MPa at a water-fly ash ratio of 0.23. To investigate the structural performance, beams of generally reinforced, steel fiber reinforced and prestressed geopolymer concrete with comparable geometries were fabricated and tested under two-point loading. The results revealed that steel fiber reinforced and prestressed geopolymer concrete beams exhibited 14 and 32 % higher ultimate strength, respectively, as compared with generally reinforced geopolymer concrete beams. Moreover, beam stiffness improved by 22 % (steel fiber reinforced geopolymer concrete) and 25 % (prestressed geopolymer concrete). All the beam types satisfied serviceability limits, with deflections below the code-specified span/250 ratio at cracking load. Strain measurements indicated reductions of 10 % in steel fiber reinforced geopolymer concrete and 40 % in prestressed geopolymer concrete relative to generally reinforced geopolymer concrete, with maximum strains of 0.036 (steel fiber reinforced geopolymer concrete), 0.035 (prestressed geopolymer concrete) and 0.030 (generally reinforced geopolymer concrete). Ductility ratios were observed to improve by 6–7 % in both steel fiber reinforced geopolymer concrete and prestressed geopolymer concrete beams. Crack analysis revealed that the flexural failures were predominant in generally reinforced and steel fiber reinforced geopolymer concrete beams, while prestressed geopolymer concrete beams exhibited shear-dominated failures with diagonal tension cracks. 10.18149/MPM.5352025_13 stiffness geopolymer deflection polymerization alkalinity https://mpm.spbstu.ru/article/2025.110.13/ 13_lam_tqk_et_al.pdf

RAR RUS 164-180 0000-0002-0090-5745 RUDN University Hematibahar M.

Moscow, Russia

0000-0002-2279-1240 Far Eastern Federal University Fediuk R.S.

Vladivostok, Russia

0000-0002-1196-8004 Peter the Great St. Petersburg Polytechnic University Vatin N.I.

St.Petersburg, Russia

Tarbiat Modares University Milani A.

Tehran, Iran

Tarbiat Modares University Tahmasebi A.

Tehran, Iran

Tarbiat Modares University Kordi O.

Tehran, Iran

0000-0002-2773-4114 Moscow State University of Civil Engineering Kharun M.

Moscow, Russia

Far Eastern Federal University Fediuk G.R.

Vladivostok, Russia

Perm Military Institute of the National Guard Troops of the Russian Federation Shangutov A.O.

Perm, Russia

Perm State Humanitarian Pedagogical University Gitman Y.K.

Perm, Russia

Concrete column performance enhanced by 3D-printed honeycomb, chiral auxetic, and re-entrant lattices via FDM and DLP methods This study addresses a gap in the literature by investigating the reinforcement of mini-columns with 3D-printed lattice structures to improve the mechanical performance of cementitious materials for structural applications. Three reinforcement patterns honeycomb, re-entrant auxetic, and chiral auxetic were designed and fabricated using two additive manufacturing methods: fused deposition modeling (FDM) and digital light processing (DLP). Polylactic acid was used for FDM, and photopolymer resin for DLP printing. Each pattern was printed in both cylindrical and hyperboloid geometries and embedded into concrete mini-columns. The objective was to evaluate their influence on compressive strength, flexural behavior, and strain performance. Testing, including ultrasonic pulse velocity, was conducted to assess internal integrity. Results show that the type, placement, and geometry of the reinforcement significantly influenced mechanical performance, with DLP-printed structures providing higher resolution and improved interfacial bonding. Among the patterns, the re-entrant auxetic geometry yielded the highest enhancement in compressive strength up to 18 % compared to unreinforced samples, demonstrating the potential of auxetic designs in structural reinforcement. 10.18149/MPM.5352025_14 fused deposition modeling digital light processing auxetic structure spent coffee grounds peanut shell https://mpm.spbstu.ru/article/2025.110.14/ 14_hematibahar_et_al.pdf