https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
22
1
2015
1-100
RAR
RUS
1-14
Deenbandhu Chhotu Ram University
Garg
Murthal (Sonipat), India
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
Swami Devi Dyal Institute of Engineering &Technology
Sharma
Barwala, India
Reflection of plane waves in transversely isotropic micropolar viscothermoelastic solid
The reflection of plane waves at the free surface of transversely isotropic micropolar viscothermoelastic medium is investigated. It is found that there exist four types of plane waves in transversely isotropic micropolar viscothermoelastic medium, namely quasi-longtitudinal displacement (qLD), quasi-transverse displacement (qTD), quasitransverse microrotaional (qTM), quasi-thermal (qT) wave. The amplitude ratios corresponding to reflected waves are obtained numerically when different waves are incident. Numerically simulated results are depicted graphically with respect to the frequency. The effect of viscosity on the amplitude ratios are shown graphically for specific model. Some particular results are also deduced.
plane waves; reflection; transversely isotropic micropolar viscothermoelastic medium
https://mpm.spbstu.ru/article/2015.38.1/
MPM122_01_kumar.pdf
RAR
RUS
15-19
St. Petersburg Academic University
Berdnikov
St.Petersburg, Russia
I.I. Polzunov Altai State Technical University
Starostenkov
Barnaul, Russia
Altai State Technical University
Poletaev
Gennady M.
Barnaul, Russia
Altai State Technical University,
Sannikov
Barnaul, Russia
Molecular dynamics study of plastic deformation mechanisms near the interphase boundary in two-dimensional bimetallic systems
The atomic mechanisms of plastic deformation near the Ni-Al, Cu-Au, Ni-Fe coherent interphase boundaries in two-dimensional model are studied by the method of molecular dynamics. It is shown that plastic deformation near the interphase boundary is closely connected with misfit dislocations. Plastic shears and destruction of the bimetals are initiated near the misfit dislocations cores.
two-dimensional bimetallic systems; the interphase boundary; plastic deformation; molecular dynamics study
https://mpm.spbstu.ru/article/2015.38.2/
MPM122_02_poletaev.pdf
RAR
RUS
20-29
A.A. Blagonravov Institute of Machine Science, Russian Academy of Science
Voronin
Moscow, Russia
The mechanics of contact interaction of a rigid sphere with an elastic-plastic topocomposite
The mechanics of contact interaction of a rigid sphere with a two-layer elasticplastic half-space (topocomposite) that simulates the surface with a thin protective coating is considered. The changes in strain-force contact parameters and certain characteristics of effective (bearing capacity and yield stress) due to strain hardening of the base material of the laminated body are obtained. The results can be used to establish relation between: a) the characteristics of the indentation in the elastic-plastic material and uniaxial tension and b) the values of the mechanical characteristics of the components of the layered elastoplastic body and the values of the composite hardness hardened surface.
two-layer elastic-plastic half-space (topocomposite); contact interaction of a rigid sphere with a topocomposite
https://mpm.spbstu.ru/article/2015.38.3/
MPM122_03_voronin.pdf
RAR
RUS
30-38
Ioffe Institute
Sharofidinov
St.Petersburg, Russia
ITMO University
V.E. Bougrov
St.Petersburg, Russia
Ioffe Institute
Mynbaev
St.Petersburg, Russia
Ioffe Institute
Stepanov
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Odnoblyudov
St.Petersburg, Russia
Ioffe Institute
Nikolaev
St.Petersburg, Russia
F-1445-2014
7202768874
0000-0003-3738-408X
ITMO University
Romanov
Alexey
alexey.romanov@niuitmo.ru
St.Petersburg, Russia
Ioffe Institute
Mynbaeva
St.Petersburg, Russia
Ioffe Institute
Pechnikov
St.Petersburg, Russia
Light-emitting p-n structures fabricated with hydride vapor-phase epitaxy on GaN/Al2O3 structured substrates
A possibility is shown to use GaN/Al2O3 substrates with internal voids fabricated with metal-organic chemical vapor deposition (MOCVD) for the growth of light-emitting structures based on p-n junctions by hydride vapor-phase epitaxy (HVPE). Within the frames of the work, an extensive characterization of the grown HVPE films with n- and p-type conductivity and formed p-n junctions was performed. The results obtained show possibilities that HVPE method offers in respect to the fabrication of the elements of device structures based on GaN.
light-emitting р-n structures; hydride vapor-phase epitaxy; GaN/Al2O3 substrates with internal voids
https://mpm.spbstu.ru/article/2015.38.4/
MPM122_04_mynbaeva.pdf
RAR
RUS
39-43
ITMO Univesity
Ignatiev
St.Petersburg, Russia
ITMO Univesity
Ignatiev
St.Petersburg, Russia
ITMO University
Nikonorov
St.Petersburg, Russia
ITMO Univesity
Klyukin
St.Petersburg, Russia
ITMO Univesity
Sidorov
St.Petersburg, Russia
Influence of mechanical deformation and heat treatment on the state of silver nanoparticles in photo-thermo-refractive glasses
This work is devoted to the investigation of the influence of mechanical deformation of photo-thermo-refractive glasses in the temperature range 800-1000 °С on the state of silver nanoparticles. It is shown that halide shell of the silver nanoparticles is dissolved during the sample stretching. That results in the shift and the increase of the plasmon peak on the absorption spectra. The heat treatment of non-stretched glass at the same temperatures results in the decreasing of the plasmon peak amplitude and in its blue-shift.
photo-thermo-refractive glasses; silver nanoparticles; mechanical deformation; heat treatmen
https://mpm.spbstu.ru/article/2015.38.5/
MPM122_05_klyukin.pdf
RAR
RUS
44-47
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
Punjab Technical University
Kumar
Jalandhar, Punjab, India
Elastodynamic response due to mechanical forces in a microstretch thermoelastic medium with mass diffusion
The present investigation deals with the 2-dimensional deformation in a homogeneous microstretch thermoelastic medium with mass diffusion due to mechanical forces. The normal mode analysis technique is used to obtain the components of displacement, microrotation, microstress, mass concentration and temperature change due to normal force and tangential force. The numerical computation has been performed (using matlab software) on the resulting quantities. The computed numerical results are shown graphically to depict the effect of microstretch, diffusion and relaxation times. Some particular cases of interest are also deduced from the present investigation.
normal and tangential force; microstretch; thermoelastic; normal mode analysis technique; deforming force; microstress force; boundary value problem
https://mpm.spbstu.ru/article/2015.38.6/
MPM122_06_kumar.pdf
RAR
RUS
53-58
Ioffe Institute
Nikitina
St.Petersburg, Russia
Ioffe Institute
Seredova
St.Petersburg, Russia
Ioffe Institute
Mynbaeva
St.Petersburg, Russia
ITMO University
V.E. Bougrov
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Odnoblyudov
St.Petersburg, Russia
Ioffe Institute
Stepanov
St.Petersburg, Russia
Ioffe Institute
Nikolaev
St.Petersburg, Russia
Ioffe Institute
Sharofidinov
St.Petersburg, Russia
Ioffe Institute
Golovatenko
St.Petersburg, Russia
Thick GaN layers on silicon substrate
In the article we report on results of epitaxial growth of GaN on Si substrate in the new HVPE reactor. The reactor was designed for growth of GaN on substrates with diameter up to 76 mm. Thin layer of AlN were deposited in MOCVD reactor in order to prevent reaction between Ga and Si. 10-micron-thickness flat GaN layers were fabricated on MOCVD AlN/Si by HVPE. The GaN layers were characterized by PL, XRD, SEM and mercury probe. The FWHM of XRD rocking curves for GaN peak (0002) was about 500 arcsec, that is similar for the best samples MOCVD GaN/Si.
thick GaN layers; silicon substrate
https://mpm.spbstu.ru/article/2015.38.7/
MPM122_07_sharofidinov.pdf
RAR
RUS
59-58
Ioffe Institute
Maslov
St.Petersburg, Russia
Ioffe Institute
Golovatenko
St.Petersburg, Russia
Ioffe Institute
Krymov
St.Petersburg, Russia
Ioffe Institute
Stepanov
St.Petersburg, Russia
ITMO Univesity
Zhumashev
St.Petersburg, Russia
ITMO University
V.E. Bougrov
St.Petersburg, Russia
F-1445-2014
7202768874
0000-0003-3738-408X
ITMO University
Romanov
Alexey
alexey.romanov@niuitmo.ru
St.Petersburg, Russia
Ioffe Institute
Nikolaev
St.Petersburg, Russia
Ioffe Institute
Pechnikov
St.Petersburg, Russia
GaN growth ON β-Ga2O3 substrates by HVPE
Gallium oxide β-Ga2O3 crystals were grown by a seedless crystallization from a Ga2O3-Al2O3 melt. Platelets with (100) orientation were produced by cleaving of the β-Ga2O3 ingot. These platelets were employed as substrates for GaN deposition by HVPE. Properties of the β-Ga2O3 crystals and GaN epitaxial layers on β-Ga2O3 substrates were studied.
GaN on β-Ga2O3 substrates; GaN deposition by HVPE
https://mpm.spbstu.ru/article/2015.38.8/
MPM122_08_nikolaev.pdf
RAR
RUS
64-68
Peter the Great St. Petersburg Polytechnic University
Trofimova
St.Petersburg, Russia
Ioffe Institute
Zograf
St.Petersburg, Russia
Ioffe Institute
Timashov
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Pulnev
St.Petersburg, Russia
Universitat de les Illes Balears
Kustov
Palma de Mallorca, Spain
Ioffe Institute
Nikolaev
St.Petersburg, Russia
Ioffe Institute
Averkin
St.Petersburg, Russia
Ioffe Institute
Yakushev
St.Petersburg, Russia
Shape memory deformation recovery features in Cu-Al-Ni single crystals
Shape memory recovery strain at reverse martensitic transformation has been investigated in Cu-13.6 wt.% Al-4.0 wt.% Ni alloy single crystals. It is found that the rate of recovery depends on previous SM deformation nonlinearly and can drastically increase with increasing SM deformation up to values close to full shape memory deformation (~7-9 %).
shape memory effect; Cu-Al-Ni alloy single crystals
https://mpm.spbstu.ru/article/2015.38.9/
MPM122_09_averkin.pdf
RAR
RUS
69-67
Institute for Problems of Mechanical Engineering of the RAS
Semenov
St.Petersburg, Russia
CIMC JSC Russian Railroads
Darienko
Russia
Institute for Problems of Mechanical Engineering of the RAS
Bratov
St.Petersburg, Russia
St.-Petersburg State University
Petrov
St.Petersburg, Russia
Modelling the high-speed train induced dynamic response of railway embankment
FEM model (2D and 3D) to simulate dynamic deformations of railroad embankment and underlying soil is presented. Numerical modeling is performed for the railway embankment geometry used in Russian Federation. Loading conditions were corresponding to forces created by SAPSAN (Siemens Velaro RUS) high-speed train and TGV train. Since there was no possibility to experimentally measure displacements and accelerations inside ballast layer induced by SAPSAN train, the numerical model was validated using experimentally measured displacements and accelerations exited inside the railway embankment by cargo train traveling at several different speeds (20-120 km/h). The validated model was used in order to predict displacements and accelerations induced in the ballast layer by high-speed moving (50-315 km/h) SAPSAN train.
railroad embankment; dynamic deformations; FEM modelling
https://mpm.spbstu.ru/article/2015.38.10/
MPM122_10_bratov.pdf
RAR
RUS
78-85
Mordovia State University N.P. Ogareva
Yudin
Saransk, Russia
Mordovia State University N.P. Ogareva
Sigachyov
Saransk, Russia
Mordovia State University N.P. Ogareva
Fomin
Saransk, Russia
Mordovia State University N.P. Ogareva
Ivlev
Saransk, Russia
Creep of solid epoxy resin
Creep tests were carried out on cured epoxy resin ED-20, depending on the voltage (10 ÷ 50 MPa) and temperature (18 ÷ 40 °C). In all cases the dependence of the strain on the time was characteristic of the low temperature (logarithmic) creep. It is shown that for the interpretation of experimental data is possible using the model developed for crystalline solids. The estimation of the size of "elementary volume", which can be subjected to continuous deformation regardless of the deformation of the neighboring elementary volume.
epoxy resin; creep; mechanical properties; deformation; temperature
https://mpm.spbstu.ru/article/2015.38.11/
MPM122_11_ivlev.pdf
RAR
RUS
86-82
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
RTM Nagpur University
Deshmukh
Maharashtra, India
Kamala Nehru Mahavidyalaya
Khandait
Maharashtra, India
Thermal stresses in a circular plate by a moving heat source
In the present paper, the problem of dynamic thermal stresses in a circular plate by a moving heat source subject to certain boundary conditions is studied. Solutions and numerical results are obtained for the temperature, displacement and stress components. Numerical results are given and illustrated graphically.
heat conduction; thermal stresses; angular velocity; thin circular plate; Bessel's function
https://mpm.spbstu.ru/article/2015.38.12/
MPM122_12_deshmukh.pdf
RAR
RUS
94-100
Dalian University of Technology
Zongjin
Dalian, China
Dalian University of Technology
Zhenyuan
Dalian, China
Dalian University of Technology
Liqi
Dalian, China
Dalian University of Technology
Dong
Dalian, China
Dalian University of Technology
Fei
Dalian, China
Dalian University of Technology
Wang
Dalian, China
Research on piezoelectric quartz under multidimensional forces
Considering that the traditional sensors can.t work well in the field with spacial requirements, such as wind tunnel experiment, a research of small sensor to measure multidimensional aerodynamic load is carried out. Based on anisotropic elastic theory, the polarization field inside the square Y0-cut quartz wafer under multidimensional/six dimensional (6-D) forces is studied. With the method of splitting electrode, the mapping relationships between forces and the induced charges on each area are deduced. And then by using the piezoelectric effect models of ANSYS, simulation analysis about the quartz wafer under 6-D forces is made, obtaining the distribution of electric potential and electric field. The results of the theoretical and simulated analysis show that it exists a quantitative and mathematical relationship between the density of induced charges on each area and the tangential force and torque. The other stresses can be acquired by overlaying the wafer group. The study provides a new ideal for the production of small-size piezoelectric system to measure multidimensional forces.
multidimensional forces; anisotropic; piezoelectric; area; quantitative
https://mpm.spbstu.ru/article/2015.38.13/
MPM122_13_wang.pdf