https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
50
2
2022
1-171
RAR
RUS
193-199
113263
6701854079
0000-0001-9909-2950
Institute of Problems of Mechanical Engineering RAS
Sheinerman
Alexander
St.Petersburg, Russia
Strengthening of nanocrystalline alloys by grain boundary segregations
We suggest a model that describes the strengthening of nanocrystalline metallic alloys due to inhomogeneous grain boundary (GB) segregations. Within the model, inhomogeneous GB segregations are modeled by spherical dilatational inclusions whose elastic fields interact with lattice or GB dislocations. We consider two modes of plastic deformation of nanocrystalline alloys: GB sliding realized via the motion of GB dislocations over GBs and slip of lattice dislocations across grains. The calculations demonstrate that in the case of GB sliding, which occurs in nanocrystalline alloys with the finest grains, inhomogeneous segregations induce only moderate strengthening. In contrast, high strengthening due to GB segregations is achieved in nanocrystalline alloys with larger grain sizes, deformed through lattice dislocation slip. This implies that the preferred kind of segregations for maximum strengthening of nanocrystalline alloys can depend on their grain size.
10.18149/MPM.5022022_1
nanocrystalline alloys; grain boundaries; segregations; strengthening
https://mpm.spbstu.ru/article/2022.91.1/
1-A_G_-Sheinerman(1).pdf
RAR
RUS
200-215
Motilal Nehru National Institute of Technology Allahabad
Gupta
Uttar Pradesh, India
0000-0001-6174-364X
Motilal Nehru National Institute of Technology Allahabad
Gupta
Uttar Pradesh, India
Hybrid optimization approach on electrical discharge machining process for hybrid Al-Al2O3/B4C composites
In the present investigation, influences of process parameters such as pulse current, pulse on time, gap voltage, and sample compositions on the machining of hybrid Al-Al2O3/ B4C composites through wire electrical discharge machining (WEDM) are carried out. The parameters were optimized to minimize both material removal rate (MRR) and surface roughness (SR) through Taguchi and Grey relational analysis. The hybrid
Al-Al2O3/ B4C MMCs containing the micro-particles of Al2O3 (purity 99 % and 100-325 mesh size) and B4C (purity 99% and 400 mesh size) were prepared by stir casting with varying proportions (i.e. 100/0, 75/25, 50/50, 25/75 and 0/100) of Al2O3 and B4C as a reinforcements. The morphology of the machined samples was also examined through SEM and found the presence of micro-ridges, micro craters, micro-cracks, black patches, debris, and micro-voids. The experimental results revealed the optimal grouping of process parameters as sample composition of B75A25 (75% B4C +25% Al2O3), pulse on time of 32 μs, pulse current of 2 A, and gap voltage of 40 V.
10.18149/MPM.5022022_2
hybrid composites
metal matrix composites
optimization
wire electrical discharge machining
scanning electron microscopy
https://mpm.spbstu.ru/article/2022.91.2/
2-P_K_-Gupta%2C-M_-K_-Gupta.pdf
RAR
RUS
216-225
0000-0001-9957-022X
Institute for Problems in Mechanical Engineering RAS
Zaitceva
St. Petersburg, Russia
0000-0001-6323-2931
Institute for Problems in Mechanical Engineering RAS
Andrievsky
St. Petersburg, Russia
Adaptive multiple synchronization and rotors phase shift tracking for two-rotor vibration machine
The paper presents the results of simulation and experiments of the adaptive control algorithm for various values of the multiplicity of the rotor's rotational frequencies and a given phase shift between them for the twin-rotor vibratory unit SV-2M. The simulation and experimental results demonstrate the rotational speeds and phase shifts between the rotors. Also, the process of adaptive controller adjustment is shown. The performance of the vibration machine demonstrates the effectiveness of the proposed algorithm in wide operating modes. Further on, the development of automated control algorithms in vibration machines promises the transition toward intelligent vibration technologies. It allows regulating the type of vibration fields of the table in real-time, including improving the process of vibration mixing by chaotizing its movement.
10.18149/MPM.5022022_3
nonlinear oscillations
PI controller
asynchronous drive
unbalanced rotor
self-synchronization
vibration technologies
intelligent control
https://mpm.spbstu.ru/article/2022.91.3/
3-I_S_-Zaitceva%2C-B_R_-Andrievsky.pdf
RAR
RUS
226-238
36169811300
0000-0002-0873-0046
Maharishi Markandeshwar University
Kaushal
Haryana, India
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
0000-0002-3527-8497
Lovely Professional University
Arun Kochar
Phagwara, India
Wave propagation under the influence of voids and non-free surfaces in a micropolar elastic medium
A problem of reflection of elastic wave in micropolar media with the void at non-free surface is considered. The governing equations are formulated for a specific model. The equations so obtained are put in two dimensions and converted into dimensionless form and then solved with the help of the reflection technique. Non-free boundary conditions are taken to obtain the amplitude ratios of different reflected waves i.e. Longitudinal displacement wave (LD-wave), Longitudinal void volume fraction wave (LVVF-wave), Transverse wave (T-wave), and Micro-rotational wave (MR-wave). These amplitude ratios are obtained numerically and also shown graphically for the non-free surface as well as for the free surface to depict the impact of stiffness and void. From the present study, certain cases are also deduced.
10.18149/MPM.5022022_4
wave propagation
non-free surface
micropolar
void
amplitude ratio
https://mpm.spbstu.ru/article/2022.91.4/
4-Sachin-Kaushal%2C-Rajneesh-Kumar%2C-Arun-Kochar.pdf
RAR
RUS
239-251
0000-0002-0185-5452
Peter the Great St. Petersburg Polytechnic University
Zolotorevsky
St.Petersburg, Russia
0000-0003-1619-309X
Peter the Great St. Petersburg Polytechnic University
Rybin
St.Petersburg, Russia
0000-0003-3094-8559
Central Research Institute of Structural Materials “Prometey”
Ushanova
St.Petersburg, Russia
0000-0002-3012-1407
Peter the Great St. Petersburg Polytechnic University
Matvienko
St.Petersburg, Russia
0000-0002-0437-8540
Mechanical Engineering Research Institute, Russian Academy of Science
Perevezentsev
Nizhni Novgorod, Russia
Comparative study of grain fragmentation in iron during cold and warm deformation by uniaxial tension
The microstructure fragmentation in iron tensile specimens deformed at room temperature and 600°C has been studied by means of EBSD. The aim of the research was to characterize and compare the patterns of fragmentation associated with the appearance and accumulation of deformation-induced high-angle boundaries (HABs). The microstructure was examined on the longitudinal section of necked specimens, in locations corresponding to various true strains from 0.5 to 1.6. It has been shown that a length of deformation-induced boundaries per unit area is characterized by rapid growth at small strains. With further straining, it ceases to grow in a low-angle interval of misorientations, whereas continues to grow in a high-angle interval. The accumulation of HABs occurs considerably faster during cold deformation, mainly through the formation of transition zones between grain-scale deformation bands.
10.18149/MPM.5022022_5
iron
plastic deformation
dynamic recrystallization
microstructure
EBSD
https://mpm.spbstu.ru/article/2022.91.5/
5-N_Yu_-Zolotorevsky%2C-V_V_-Rybin-et-al.pdf
RAR
RUS
252-265
0000-0001-7577-1262
Ioffe Institute
Klyachkin
L.E.
St.Petersburg, Russia
0000-0001-8286-3472
Ioffe Institute
Bagraev
N.T.
St.Petersburg, Russia
0000-0002-4667-7004
Ioffe Institute
Malyarenko
A.M.
St.Petersburg, Russia
Macroscopic quantum effects of electromagnetic induction in silicon nanostructures
At room temperature, a macroscopic quantum galvanomagnetic effect of Faraday electromagnetic induction was demonstrated under conditions of the capture of single magnetic flux quanta in the edge channels, confined by chains of negative-U centers, in a silicon nanostructure heavily doped with boron, prepared in Hall geometry on an n-type Si (100) substrate. It is shown that this effect leads to the appearance of an induction current when only a constant magnetic field is applied in the absence of an externally applied voltage or a stabilized current. The experimental dependences of Uxx, Uxy, and Upn on the magnitude of the external magnetic field in its various directions demonstrate both the Hall staircase of conductivity and the Shubnikov–de Haas oscillations.
10.18149/MPM.5022022_6
silicon nanostructure
negative-U centers
electromagnetic induction
Hall staircases of conductivity
Shubnikov-de Haas oscillations
https://mpm.spbstu.ru/article/2022.91.6/
6-L_E_-Klyachkin%2C-N_T_-Bagraev.pdf
RAR
RUS
266-274
0000-0002-7947-801X
Kazan Federal University
Shafigullin
Kazan, Russia
0000-0003-2484-346X
Kazan Federal University
Romanova
Kazan, Russia
0000-0001-8407-8144
Ogarev Mordovia State University
Erofeev
Saransk, The Republic of Mordovia, Russia
0000-0003-4667-8311
Kazan National Research Technical University named after A.N. Tupolev
Gabdrakhmanov
Kazan, Russia
0000-0003-2106-6271
Kazan Federal University
Bobryshev
Kazan, Russia
Using products of polyethylene recycling for the production of holding tanks
In this paper, the influence of recovered high-density polyethylene on the tensile strength at break, elongation at break, hardness Shore D, flexural strength, and сharpy impact energy of the polymer compositions has been studied, as well as the process has been developed for rotational moulding of holding tanks made of products of polyethylene recycling. The developed compositions have satisfactory physical-mechanical properties, and they can be used effectively to make holding tanks from products of polyethylene recycling with modifying plasticizer. Notably, the products have a lower cost as compared to products made of virgin polyethylene. The developed technology of holding tank production from products of polyethylene recycling addresses the important environmental problem regarding the management of polymer waste and the transition to a circular economy.
10.18149/MPM.5022022_7
polyethylene recycling
holding tanks
rotational moulding
waste management
https://mpm.spbstu.ru/article/2022.91.7/
7-L_N_-Shafigullin%2C-N_V_-Romanova-et-al.pdf
RAR
RUS
275-286
0000-0003-3281-532X
Indian Institute of Information Technology
Akhilesh Kumar Maurya
Uttar Pradesh, India
0000-0002-3248-5925
Indian Institute of Information Technology
Shagun Varshney
Uttar Pradesh, India
0000-0002-6028-7723
Indian Institute of Information Technology
Nidhi Mishra
Uttar Pradesh, India
Synthesis and characterization of polymeric hydrogel-based nanoporous composite and investigation of its temperature-dependent drug release activity
Hydrogels are 3-dimensional polymeric networks that undergo swelling when placed in an aqueous medium. The hydrogel-based polymers can respond to changes in the surrounding like temperature, pressure, pH, etc. Widespread cross-linking in hydrogels provides it with robustness, propensity for water, and better mechanical properties. The present work reports the one-pot chemical synthesis of a co-polymeric hydrogel-based composite using 2-HEMA (hydroxyethyl methacrylate), PEGMA (Polyethylene glycol), and PNIPAM (Poly (N-isopropyl acrylamide)). Extensive water retention ability and biocompatibility are some distinguishing features that enable it to be used for various biomedical applications. The hydrogel was characterized using X-ray diffraction analysis for its crystalline nature, scanning electron microscopy for surface morphology and pore size, and Fourier transform infrared spectroscopy for functional group analysis. Drug loading and release activity was performed and analyzed by Ultraviolet-Visible spectroscopy.
10.18149/MPM.5022022_8
composite
characterization
drug loading
hydrogel
thermos-responsive polymer
https://mpm.spbstu.ru/article/2022.91.8/
8-Akhilesh-Kumar-Maurya%2C-Shagun-Varshney%2C-Nidhi-Mishra.pdf
RAR
RUS
287-303
0000-0003-0041-9971
Peter the Great St. Petersburg Polytechnic University
Bykov
St.Petersburg, Russia
0000-0003-1107-3259
Peter the Great St. Petersburg Polytechnic University
Obraztsov
St. Petersburg, Russia
0000-0002-5222-583X
ITMO University
Hvatov A.A.
St. Petersburg, Russia
0000-0001-5595-0802
ITMO University
Maslyaev
St. Petersburg, Russia
0000-0003-4671-5741
Institute for Electrophysics and Electric Power RAS
Surov
St. Petersburg, Russia
Hybrid modeling of gas-dynamic processes in AC plasma torches
A model of plasma-forming gas flows in AC plasma torches was proposed for the range of operating parameters typical for technologies for the synthesis of perspective materials. It assumes the solution of the Navier-Stokes equations together with the equation for the electric field potential and includes a model of arc root motion. The law of the motion was restored by the method of generative model design from the available experimental data. The COMSOL MultiphysicsR package was used for simulations. An additional analysis of the applicability of various package modules for modeling essentially subsonic compressible flows with energy release was carried out. Recommendations were given for the simulation of flows in AC plasma torches. The influence of the arc root motion on the flow pattern was studied and the significant asymmetry in the gas-dynamic parameter distributions was shown.
10.18149/MPM.5022022_9
AC plasma torch
model of plasma-forming gas flow
arc root motion
method of generative model design
energy release into flow
https://mpm.spbstu.ru/article/2022.91.9/
9-N_V_-Obraztsov-et-al.pdf
RAR
RUS
304-318
Government Engineering College
Murali Mohan
Hassan, India
University Visveswaraya College of Engineering Bangalore
Kempaiah
Bangalore, India
Acharya Institute of Technology
Manjunatha
Bangalore, India
0000-0002-8248-7603
Aircraft Research and Design Centre, Hindustan Aeronautics Limited
Nagaral Madeva
Bangalore, India
0000-0001-6549-6340
Siddaganga Institute of Technology Tumkur
Auradi
Tumkur, India
Processing and wear behavior optimization of B4C and rice husk ash dual particles reinforced ADC12 alloy composites using Taguchi method
The composite material comprises either two or more constituents having dissimilar physical and chemical properties. The composite is prepared by various techniques, but the stir casting method has been widely used, as it is simple and cost-effective. In the present work, the composites from ADC12 Aluminum Alloy-Boron Carbide (B4C) (wt.5%) and varied wt % of Rice Husk Ash (RHA) were developed with the help of the stir cast technique. Composite having 3, 6, 9 wt.% of RHA were considered for the wear analysis. The wear analysis of hybrid composites was studied with the help of Taguchi method and also optimum values were determined. The tribological study was conducted on the Pin on disk testing apparatus under dry sliding conditions. The L27 orthogonal array has been preferred in the present work to include three factors and three levels. The selected factors are Speed (N), Load (W), RHA, and wear depth as system output (yield). Analysis of variance has been carried out to know the parameters' influence and level of contribution to the wear loss. For, the validation of the analysis results the experimental test was carried out for the optimum values. To understand the wear mechanism in composites the samples were analyzed using Scanning Electron Microscopic (SEM) and it has been observed that both abrasive, as well as adhesive wear, did occur on the contact surface of the specimens.
10.18149/MPM.5022022_10
ADC12 Alloy
B4C
rice husk ash
microstructure
wear
optimization
Taguchi
https://mpm.spbstu.ru/article/2022.91.10/
10-R_-Murali-Mohan%2C-U_N_-Kempaiah-et-al.pdf
RAR
RUS
319-330
0000-0001-6494-1377
FGBOU VPO Volgograd State Agrarian University
Dzhabrailov
Volgograd, Russia
0000-0002-7098-5998
FGBOU VPO Volgograd State Agrarian University
Nikolaev
Volgograd, Russia
0000-0002-1027-1811
FGBOU VPO Volgograd State Agrarian University
Klochkov
Volgograd, Russia
0000-0003-3496-2008
Financial University under the Government of the Russian Federation
Gureyeva
Moscow, Russia
Finite element algorithm for implementing variants of physically nonlinear defining equations in the calculation of an ellipsoidal shell
The defining equations at the loading step are obtained in three variants. In the first variant, the relations between strain increments and stress increments are obtained by differentiating the equations of the theory of small elastic-plastic deformations using the hypothesis of plastic incompressibility of the material. In the second variant, the assumption of plastic incompressibility was not used. The relations between the first invariants of stress and strain tensors were considered to be known from the extension test. In the third variant, the defining equations at the loading step are obtained without dividing the strain increments into elastic and plastic parts based on the hypothesis of proportionality of the components of the strain increment deviators and the components of the stress increment deviators using the relations between the first invariants of the stress and strain increment tensors determined experimentally. The numerical example shows the preference of the third variant of the defining equations.
10.18149/MPM.5022022_11
shell
strain tensor
finite element
displacement vector
physical nonlinearity
plasticity matrix
stress tensor
https://mpm.spbstu.ru/article/2022.91.11/
11-A_Sh_-Dzhabrailov-et-al.pdf
RAR
RUS
331-341
0000-0002-5733-5915
Institute for Problems in Mechanical Engineering RAS
Atroshenko
St. Petersburg, Russia
0000-0002-2904-6200
JSC "Armalit"
Smakovsky
St. Petersburg, Russia
0000-0001-6069-302X
St. Petersburg Institute of Technology (Technical University)
Savenkov
St. Petersburg, Russia
Kinetics of the microstructure of targets from FCC alloys under high-strain-rate deformation
The protection of various objects experiencing shock loads from the impact of irregularly shaped impactors with impact velocities over 1.5-2.0 km/s is of considerable interest and is relevant. Computer modeling of the processes of high-speed interaction of impactors with various objects in order to create optimal designs requires deep knowledge of the physical and mechanical properties and processes occurring in the thickness of at least the material of the barrier (object). However, the existing technical measuring instruments make it possible to register only the kinematic parameters of the deformation and destruction of the barrier and impactor, while the development of internal processes remains inaccessible for visualization. In addition, the physical processes of high-speed deformation and destruction occurring in obstacles are highly dependent on the many contact boundaries that are inherent in irregularly shaped strikers, and in computer modeling and experimental studies, strikers, as a rule, have the correct geometric shape (cylinder, sphere). As a result, there is a significant loss of calculation accuracy. The article is devoted to the analysis of the behavior of various FCC metals – aluminum alloys, stainless steel, and aluminum bronze under impact loading by irregularly shaped projectiles with velocities of 1.5-2.0 km/s. Transformations of the deformed state of materials are revealed and it is shown that they depend little on the initial structure.
10.18149/MPM.5022022_12
Aluminum alloy
stainless steel
aluminum bronze
shock loading
https://mpm.spbstu.ru/article/2022.91.12/
12-S_A_-Atroshenko%2C-M_S_-Smakovsky%2C-G_G_-Savenkov.pdf
RAR
RUS
342-354
0000-0003-1806-0274
Computing Center of the Far Eastern Branch of the Russian Academy of Sciences
Tkachenko
Khabarovsk, Russia
Principal stress-strain states of thin-walled complexly bent pipelines
Mathematical model of the pipeline is formulated within the framework of the elastic shell theory, and the basic parameters of this model are determined. For moment and semi-momentless shells, equations of the first approximation with respect to the small curvature parameter are given. The model for calculation by the finite element method in CAE Abaqus is constructed and numerical experiments are performed. Numerical solution to the model problem is found, and stresses and bending moments are calculated on its basis. Stresses and bending moments are compared with their exact values. Numerical analysis is carried out by comparing pipe models within the framework of the shell theory and the rod theory. It is established that the proposed mathematical model makes it possible to find stresses in pipes with high accuracy.
10.18149/MPM.5022022_13
numerical experiment
thin-walled shells
mathematical model
adequacy estimates
https://mpm.spbstu.ru/article/2022.91.13/
13-O_P_-Tkachenko.pdf
RAR
RUS
355-363
0000-0002-1069-2413
Ogarev Mordovia State University
Avdonin
Saransk, Russia
0000-0003-4310-3379
Vyatka State University
Yurkin
Kirov, Russia
0000-0001-5735-3489
VPO "Vyatka State University"
Shirokova
Kirov, Russia
0000-0002-1651-5098
Vyatka State University
Varankina
Kirov, Russia
0000-0003-3966-232X
Vyatka State University
Rogozhkin
Kirov, Russia
Effect of plasticizers on the mechanical and technological properties of styrene-isoprene block copolymer composites under cyclic loading
In various applications, there is a demand for materials with damping properties. One of the promising materials in this respect is polymer composite material based on thermoplastic elastomers. When studying the experience of using thermoplastic elastomers as damping materials, it was found that one of the most promising TPEs for this purpose is block copolymer of the styrene-isoprene-styrene type. In this article, composites based on SIS VECTOR 4111NS and SIS VECTOR 4113NS thermoplastic elastomers with different plasticizer content were tested. The results showed that the composite based on SIS VECTOR 4113NS for the manufacture of damping pads is more promising. It also revealed the optimal amount of plasticizer required for the manufacture of high-quality material with the best mechanical characteristics.
10.18149/MPM.5022022_14
polymer composite materials
thermoplastics
vibration absorption
damping materials
styrene-isoprene block copolymer
building structures
https://mpm.spbstu.ru/article/2022.91.14/
14-V_V_-Avdonin-et-al(1).pdf