https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
36
1
2018
1-153
RAR
RUS
1-7
Rylkova
ITMO University
St.Petersburg, Russia
Zhiglinsky
ITMO University
St.Petersburg, Russia
V.G. Dubrovskii
ITMO Univesity
St.Petersburg, Russia
Sokolova
ITMO University
St.Petersburg, Russia
Composition and contact angle of Au-III-V droplets on top of Au-catalyzed III-V nanowires
We present a model which allows for the self-consistent determination of the stationary group III and V concentrations in the droplet and the contact angle versus the group III and V fluxes during the Au-catalyzed vapor-liquid-solid growth of III-V nanowires. The nanowire axial growth rate in the mononuclear regime is taken in the Zeldovich form. Chemical potentials of the group III and V atoms in liquid are considered within the regular solution model. We show how the group III content and the droplet contact angle can be increased be either decreasing group V flux or increasing group III flux. The group V concentration usually decreases for higher contact angles. Overall, these results can be used for modeling and fine tuning of the droplet shapes and compositions influencing the morphology and the preferred crystal structure of Au-catalyzed III-V nanowires in different epitaxy techniques.
10.18720/MPM.3612018_1
III-V nanowires; droplet composition; contact angle; VLS growth
https://mpm.spbstu.ru/article/2018.60.1/
MPM136_01_dubrovskii.pdf
RAR
RUS
8-17
Hassan
Universiti Malaysia
Terengganu, Malaysia
Noruddin
Universiti Malaysia
Terengganu, Malaysia
The effect of lithium perchlorate on poly (sodium 4-styrenesulfonate): studies based on morphology, structural and electrical conductivity
Solid polymer electrolytes (SPEs) of Poly(sodium 4-styrenesulfonate) (PSS) as a polymer host and lithium perchlorate (LC) as an ionic dopant were prepared using a single-solvent via solution casting technique. According to XRD analyses, the solid polymer electrolyte films were in amorphous phase and the coexistence of peaks of the materials (PSSand LC) confirmed that the complex films were successfully obtained. The SEM observations revealed that the films appeared to be rough, flat, and irregular shape of surfaces. The highest ionic conductivity (σ) of 7.21×10-6 S cm-1 was achieved at room temperature (303K) for the sample containing 15 wt.% LC.
Solid polymer electrolytes (SPEs) of Poly(sodium 4-styrenesulfonate) (PSS) as a polymer host and lithium perchlorate (LC) as an ionic dopant were prepared using a single-solvent via solution casting technique. According to XRD analyses, the solid polymer electrolyte films were in amorphous phase and the coexistence of peaks of the materials (PSSand LC) confirmed that the complex films were successfully obtained. The SEM observations revealed that the films appeared to be rough, flat, and irregular shape of surfaces. The highest ionic conductivity (σ) of 7.21×10-6 S cm-1 was achieved at room temperature (303K) for the sample containing 15 wt.% LC.
10.18720/MPM.3522018_2
solid polymer electrolyte; poly(sodium 4-styrenesulfonate); lithium perchlorate; ionic conductivity; impedance spectroscopy
https://mpm.spbstu.ru/article/2018.60.2/
MPM136_02_hassan.pdf
RAR
RUS
18-38
Namegawa
Nippon Steel and Sumitmo Metal Corporation
Chiba, Japan
Aihara
The University of Tokyo
Tokyo, Japan
Kawabata
The University of Tokyo
Tokyo, Japan
Nakanishi
The University of Tokyo
Tokyo, Japan
Dissipation energy during brittle crack propagation in a single crystal of 3%Si-Fe alloy
Brittle fracture in carbon steel seriously impacts structural safety. It is considered that the elementary step of the brittle fracture of polycrystalline steel corresponds to cleavage in each crystal grain and their connection process. However, the detailed mechanisms of brittle fracture are not completely understood. In this study, the elementary process of brittle crack propagation is clarified using the dynamic strain recording of a strain gauge near the crack path.The results indicate that the brittle crack propagation rate in a single crystal grain is much slower than the Rayleigh wave rate. To estimate the dissipation energy during crack propagation in a single crystal grain, dynamic finite element analyses were conducted by assuming constant critical stress during crack propagation. The dissipated energy is not small even inside a single crystal grain and appears to exhibit a proportional relationship with the stress intensity factor.
10.18720/MPM.3612018_3
brittle crack; steel; dissipation energy; single crystal
https://mpm.spbstu.ru/article/2018.60.3/
MPM136_03_kawabata.pdf
RAR
RUS
39-52
Osipov
A.V.
Institute of Problems of Mechanical Engineering RAS
St.Petersburg, Russia
Redkov
Institute of Problems of Mechanical Engineering of Russian Academy of Sciences
St.Petersburg, Russia
Grashchenko
Institute of Problems of Mechanical Engineering RAS
St.Petersburg, Russia
Soshnikov
Saint Petersburg National Research Academic University
St.Petersburg, Russia
Boiko
Ioffe Institute
St.Petersburg, Russia
Sharkov
Ioffe Institute
St.Petersburg, Russia
Dyadenchuk
Berdyansk State Pedagogical University
Berdyansk, Ukraine
Kidalov
Berdyansk State Pedagogical University
Berdyansk, Ukraine
Kukushkin
S.A.
Institute of Problems of Mechanical Engineering RAS
St.Petersburg, Russia
Growth of SiC films by the method of substitution of atoms on porous Si (100) and (111) substrates
The mechanisms of growth of silicon carbide (SiC) films by the method of substitution of atoms on macro- and mesoporous silicon substrates (Si) of p- and n-type conduction are investigated. Significant dependence of the rate and the mechanism of nucleation of SiC layers on Si on the type of Si doping and its crystallographic orientation is experimentally found. Comparison of the experimental data with the theoretical results obtained earlier is performed. It is shown that the presence of the system of pores on the surface allows one to significantly increase the thickness of silicon transformed into SiC during the process of synthesis by the method of substitution of atoms, which was equal to 115 microns in our experiments. The obtained samples are studied by methods of scanning electron microscopy, micro-Raman spectroscopy, and X-ray diffraction analysis. Numerical simulation of the distribution of elastic stresses caused by the difference in thermal expansion coefficients (TEC) in the heterostructures of GaN/SiC/porous Si/Si is conducted. It is revealed that the presence of pores in the near-surface layers of Si leads to considerable relaxation of elastic stresses in GaN films caused by differences in the TEC between GaN and Si.
10.18720/MPM.3612018_4
silicon carbide; epitaxial films SiC on Si; epitaxy; gallium nitride films; aluminum nitride films; thin films growth; porous silicon substrate
https://mpm.spbstu.ru/article/2018.60.4/
MPM136_04_kukushkin.pdf
RAR
RUS
53-59
Pivovarova
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Gulin
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Polyakova
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Calliari
University of Padova
Padova, Italy
Approach to obtaining medium carbon steel wire with a specified set of mechanical properties after combined deformational processing
Progressive development of metal ware manufacturing is closely connected with implementation of technologies with integrated or combined operations. Continuous method of wire deformational processing by drawing with bending and twisting was developed. Medium carbon steel wire with 0.5 %C was used for the experiments. The results of simulation in Deform-3D showed that distributions of tensile and compression stresses at combined deformational processing are uniform along the deformation zone. Microscopic analysis of the processed wire indicated that after combined deformational processing a homogeneous structure is formed in the medium carbon steel wire. After tensile test, it was proved that combination of drawing with bending and twisting allows ones to achieve the different combination of strength and ductile properties of medium carbon steel wire with one diameter and carbon content.
10.18720/MPM.3612018_5
medium carbon steel wire; combined deformation; drawing; bending; twisting
https://mpm.spbstu.ru/article/2018.60.5/
MPM136_05_polyakova.pdf
RAR
RUS
60-66
Brunelli
University of Padova
Padova, Italy
Efimova
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Golubchik
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Polyakova
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Chukin
Nosov Magnitogorsk State Technical University
Magnitogorsk, Russia
Study of texture and microstructure formation in medium carbon steel wire submitted to combined deformation by drawing with bending and twisting
Deformation scheme plays the significant role in texture and microstructure formation of the processed metal ensuring the definite level mechanical properties. Medium carbon steel wire with 0.5 %C was chosen for investigation. It was deformed by combined deformational processing by drawing with bending and twisting. XRD analysis of the processed wire showed that after drawing fiber texture is formed along the drawing direction. Combined deformational processing by drawing with bending and drawing with bending and twisting results in texture formation in the wire in each case in transverse direction. In microstructure of medium carbon steel wire deformation and breakdown of cementite lamellae can be noticed after all kinds of deformational processing.
10.18720/MPM.3612018_6
medium carbon steel wire;combined deformation; texture; microstructure
https://mpm.spbstu.ru/article/2018.60.6/
MPM136_06_polyakova.pdf
RAR
RUS
67-75
Babeshko
Kuban State University
Krasnodar, Russia
Zaretskaia
Kuban State University
Krasnodar, Russia
Gorshkova
Kuban State University
Krasnodar, Russia
Mukhin
Kuban State University
Krasnodar, Russia
Gladskoi
Kuban State University
Krasnodar, Russia
Babeshko
Kuban State University
Krasnodar, Russia
Evdokimova
Southern Scientific Center RAS
Rostov-on-Don, Russia
On the behavior of materials with defective coating under different contact conditions
On a multi-layered base described by the Lamé equations there is a defective coating in the form of Kirchhoff plates. Defects of two types divide the covering into two half-planes with parallel ends, which, in the first case, are spaced apart from each other by a finite distance, and in the second case the distance is absent. All types of contact of coatings with a base are studied: in the absence of friction, in the presence of shearing stresses, with complete cohesion of the coatings and the base. The stress concentration in the end zone is investigated. The block-element method is used, which allows for studying the boundary problems mathematically. A complete analysis of the stress concentration features in the problem is performed.
10.18720/MPM.3612018_7
block element; factorization; topology; integral and differential factorization methods; exterior forms; block structures; boundary problems; bodies with coverings; hidden defects
https://mpm.spbstu.ru/article/2018.60.7/
MPM136_07_babeshko.pdf
RAR
RUS
76-84
Shetov
Kabardino-Balkar State University. named H. M. Berbekov
Nalchik, Russia
Shaov
Kabardino-Balkar State University. named H. M. Berbekov
Nalchik, Russia
Orlov
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Borukaev
Kabardino-Balkar State University. named H. M. Berbekov
Nalchik, Russia
Gaev
Kabardino-Balkar State University. named H. M. Berbekov
Nalchik, Russia
Electroducing polymer composites based on high density polyethylene and technical-carbon
Electrically conductive polymer composites based on high-density polyethylene and carbon black are obtained. It is shown that polymer composites possess a positive temperature coefficient of electrical resistance. The amount of carbon black required to form electrically conductive paths in a polymer matrix is determined. Dependence of physico-mechanical and rheological characteristics of composites on the content of carbon black is revealed. The concentration interval of carbon black is determined, in which the optimal combination of physico-mechanical, rheological and electrophysical properties of composites.
10.18720/MPM.3612018_8
polyethylene; carbon black; composites; properties; electrical; mechanical; rheological; morphology
https://mpm.spbstu.ru/article/2018.60.8/
MPM136_08_borukaev.pdf
RAR
RUS
85-91
Kovalenko
Siberian State Industrial University
Novokuznetsk, Russia
Kokhanenko
Financial University under the Government of the Russian Federation, Barnaul brunch
Barnaul, Russia
Iliina
Financial University under the Government of the Russian Federation, Barnaul brunch
Barnaul, Russia
Poletaev
Altai State Technical University,
Barnaul, Russia
Novoselova
Altai State Technical University
Barnaul, Russia
Molecular dynamics investigation of grain boundaries tensions in triple junctions in nickel
In the work, the mutual tension of tilt grain boundaries with disorientation axes and in a triple junction on the example of nickel is investigated by the molecular dynamics method. The ratio of the boundary tensions found in the molecular dynamics model is compared with the ratio calculated using the Yang relation through the ratio of grain boundary energies. It is shown that both methods give close values. In addition, it was found that the elongation or contraction of low-angle tilt boundary at the triple junction motion is accompanied by the formation of zigzag displacements of atoms, which apparently appear due to the splitting and sliding of grain-boundary dislocations. The formation of new geometrically necessary dislocation during the boundary elongation occurred, as a rule, in the triple junction or in an already existing grain-boundary dislocation.
10.18720/MPM.3612018_9
molecular dynamics; triple junction; grain boundary; boundary migration; triple junction migration; boundary energy; boundary tension; tilt boundary
https://mpm.spbstu.ru/article/2018.60.9/
MPM136_09_poletaev.pdf
RAR
RUS
92-99
Kiselev
Spectron Ltd.
St.Petersburg, Russia
Matsinkevich
Spectron Ltd.
St.Petersburg, Russia
Rudnev
Spectron Ltd.
St.Petersburg, Russia
Bukin
Spectron Ltd.
St.Petersburg, Russia
Mishin
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Shishov
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Investigation of the possibility of improving the X-ray fluorescence spectrometer analytical characteristics due to using the superfine beryllium foils
Studies were made the possibilities of increasing the wave-dispersive X-rayfluorescence spectrometer analytical characteristics due to using the superfine beryllium foils5-8 μm thick in the X-ray detector. Investigations by the example of spectrometerSPECTROSCAN MAX-GVM showed that the decrease of foil thickness can significantlyincrease the spectrometer analytical characteristics in the determination of light elements(sodium and magnesium). It has been established what count rate increases 8.5 times for sodium and 4.6 times for magnesium due to using the X-ray windows with thickness of 5 and8 μm. Reducing of X-ray window thickness can be achieved by using beryllium foils obtained by severe cold plastic deformation. Such foils have increased plasticity, which allowsreducing the X-ray window thickness without spectrometer reliability decreasing.
10.18720/MPM.3612018_10
x-ray spectroscopy analysis; spectrometer; x-ray detector; thin beryllium foils; x-rays transmission
https://mpm.spbstu.ru/article/2018.60.10/
MPM136_10_mishin.pdf
RAR
RUS
100-113
Mishin
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Shishov
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Investigation of the process of deformation and destruction of thin beryllium foils under static loading by external pressure
In this paper numerical and experimental studies of deformation and fracture of thin beryllium disks with a thickness of 5-100 μm are performed. Disks, intended for use as X-ray windows, were obtained by the method of severe cold deformation. It is shown that beryllium foils under loading by external pressure (or bulge test) have higher values of ultimate strains than in tensile tests. It is established that the fracture at bulge test occurs at values of the accumulated plastic strain amounting to 15-20%, what very high for beryllium.
10.18720/MPM.3612018_11
thin beryllium foils; mechanical properties of beryllium foil; plasticity of beryllium; bulge test; beryllium fracture
https://mpm.spbstu.ru/article/2018.60.11/
MPM136_11_mishin.pdf
RAR
RUS
114-118
Logachev
St. Petersburg State University
St.Petersburg, Russia
Petrov
St. Petersburg State University
St.Petersburg, Russia
Volkov
St. Petersburg State University
St.Petersburg, Russia
Gorbushin
St. Petersburg State University
St.Petersburg, Russia
Granichin
St. Petersburg State University
St.Petersburg, Russia
Destruction of the adhesion zone by combined pulsed - vibrational impacts
The model of a string on an elastic foundation is applied to study adhesive zone delamination induced by combined vibrational - pulsed actions. The incubation time criterion is utilized in order to predict a critical delamination condition. The influence of the background ultrasonic field onto the value of threshold stress-pulse amplitudes is demonstrated using the example of several particular cases of external actions. A significant reduction of critical amplitudes is obtained with certain frequencies of background vibration field.
10.18720/MPM.3612018_12
adhesive zone; string on an elastic foundation; pulse-vibration effects
https://mpm.spbstu.ru/article/2018.60.12/
MPM136_12_gorbushin.pdf
RAR
RUS
121-130
Meshcheryakov
Yu.I.
Institute of Problems of Mechanical Engineering RAS
St.Petersburg, Russia
Atroshenko
IPME RAS
St.Petersburg, Russia
On the mesoscopic mechanisms of spall fracture
Four kinds of complex alloyed steel have been tested under uniaxial strain conditions within strain rate range of 215÷550 m/s. The kinematics of straining was studied by using SEM and optical microscopy of post-shocked specimens. The cross-section of targets is found to contain the mesoscopic rotational structures of complex configuration. Besides the free surface velocity, interference technique used allows the mean particle velocity profile and velocity variance to be registered in every shock loading. The spall strength is theoretically and experimentally found to be maximum at the strain rate where velocity variance equals to velocity defect. This condition means that local strain rate at the mesoscale equal to macroscopic strain rate. T hat strain rate corresponds to maximum density of rotations at the mesoscale.
10.18720/MPM.3612018_13
shock loading; spallation; rotational structures; velocity variance; velocity defect
https://mpm.spbstu.ru/article/2018.60.13/
MPM136_13_meshcheryakov.pdf
RAR
RUS
131-136
Kitaeva
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Rudaev
Kyrgyz-Russian Slavic University
Bishkek, Kyrgyzstan
On Macrokinetics under Dynamic Superplasticity
The experimental study of deformation behavior of group industrial aluminum alloys in the broad temperature and high-speed ranges led to creation of the mathematical model for the case of simple tensile and compression, establishing the relationship between stress, temperature and kinetic variables, and responding to analytically formulated conditions of transition to superplastic state. Within synergetic conceptions we will choose the potential function in the form of assembling catastrophe from conditions of qualitative identity of the experimental data. It is added by the kinetic equations for the control parameter and inner state parameters. The given ratios are acceptable for the description of concrete regularities of deformation when the function of material sensitivity to the structural transformations is expressed. Basic model use allow to research nonequilibrium system reaction to behavior of thermodynamic response functions – the specific heat and entropy – and to establish implementations features of the irreversible indistinct phase transitions observed in the conditions of dynamic superplasticity for aluminum alloys.
10.18720/MPM.3612018_14
aluminum alloys; specific heat; entropy; superplasticity
https://mpm.spbstu.ru/article/2018.60.14/
MPM136_14_kitaeva.pdf
RAR
RUS
137-141
Goloskokov
Admiral Makarov State University of Maritime and Inland Shipping
St.Petersburg, Russia
Matrosov
St.Petersburg State University
St.Petersburg, Russia
Approximate analytical approach in analyzing an orthotropic rectangular plate with a crack
The stretching of a rectangular plate with a crack parallel to one of its edges under the action of a uniformly distributed load is considered. An approximate analytical solution in the form of trigonometric polynomials is constructed by the superposition method using two solutions obtained by the method of initial functions (MIF). The stress-strain state in the neighborhood of the crack sides and the crack tip for orthotropic plates is investigated.
10.18720/MPM.3612018_15
method of initial functions; superposition method; cracks; method of analytical decomposition; plane problem of elasticity theory
https://mpm.spbstu.ru/article/2018.60.15/
MPM136_15_goloskokov.pdf
RAR
RUS
142-146
Matrosov
St.Petersburg State University
St.Petersburg, Russia
Suratov
St. Petersburg State University
St.Petersburg, Russia
Stress-strain state in the corner points of a clamped plate under uniformly distributed normal load
The bending of a rectangular clamped thin plate under the uniformly distributed transverse load is considered. The solution of the Sophie Germaine equation is constructed by the method of initial functions (MIF). On two opposite sides the boundary conditions are satisfied exactly. Then, on the two remaining ones, the boundary conditions are satisfied approximately by the collocation method. The results of calculations of the stress-strain state at the corner points of the plate are given.
10.18720/MPM.3612018_16
method of initial functions; bending of a plate clamped; corner points
https://mpm.spbstu.ru/article/2018.60.16/
MPM136_16_matrosov.pdf
RAR
RUS
147-153
Igumnov
Lobachevsky State University of Nizhni Novgorod
Nizhni Novgorod, Russia
Volkov
National Research Lobachevsky State University of Nizhni Novgorod
Nizhny Novgorod, Russia
Desyatnikova
Volga State University of Water Transport
Nizhny Novgorod, Russia
Defining relations of mechanics of damaged media effected by fatigue and creep
A possible version of a model describing degradation of initial strength properties of structural alloys affected by fatigue and creep is introduced, based on the modern viewpoint of mechanics of damaged media (MDM). Processes of viscoplastic deformation and damage accumulation in structural alloys are analyzed using numerical modeling. Specia attention is paid to the issues of modeling the processes of viscoplastic deformation and damage accumulation for complex deformation processes accompanied by the rotation of main stress and strain tensor areas.New qualitative and quantitative features of the failure process are noted, which are connected with stressed-strained state history, damage degree, stress relaxation and other factors.
10.18720/MPM.3612018_17
modeling; mechanics of damaged media; complex deformation; fatigue life; sustained strength; failure; service life
https://mpm.spbstu.ru/article/2018.60.18/
MPM136_17_volkov.pdf