https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
42
4
2019
1-118
RAR
RUS
373-379
ITMO Univesity
V.G. Dubrovskii
St.Petersburg, Russia
Model for the formation of GaAs-Au axial nanowire heterostructures under flash lamp annealing
Semiconductor-metal nanowire heterostructures have attracted a particular interest over the last decade. However, they often suffer from low interface and crystalline quality. Here, we present a model for the formation of GaAs-Au axial nanowire heterostructures from GaAs/Au core-shell nanowires encapsulated into SiO2 under flash lamp annealing, as described in the previous work. The model reveals the basic mechanism and establishes the main control parameters of the process which enable high quality GaAs-Au heterostructures. It can also be used for the optimization of similar processes in a wide range of material combinations.
10.18720/MPM.4242019_1
GaAs-Au nanowire heterostructures
SiO2 template
flash lamp annealing
phase diagram
modeling
https://mpm.spbstu.ru/article/2019.71.1/
MPM442_01_dubrovskii.pdf
RAR
RUS
380-388
Altai State Technical University
Poletaev
Gennady M.
Barnaul, Russia
Siberian State Industrial University
Zorya
Novokuznetsk, Russia
Altai State University
Rakitin
Barnaul, Russia
Financial University under the Government of the Russian Federation, Barnaul brunch
Iliina
Barnaul, Russia
Interatomic potentials for describing impurity atoms of light elements in fcc metals
Parameters of Morse potentials for describing the interactions of atoms of light elements C, N, O with atoms of fcc metals Al, Ag, Ni are found. This set of three metals is unique in that two of them have almost the same radii of atoms, while the other two have almost identical electronegativities. The search for potential parameters was carried out according to the empirical relationships observed for a large number of metals having C, N or O impurities. For this purpose, the most studied characteristics were chosen: the melting or decomposition temperature of the corresponding chemical compound of the metal with the light element and the activation energy of diffusion of the impurity atom in the crystal lattice of the metal. In the paper, in addition, we have corrected the potentials found earlier to describe interatomic interactions in Pd-H and Ni-H systems.
10.18720/MPM.4242019_2
interatomic potential
molecular dynamics
impurity
interstitial
fcc metal
carbon
nitrogen
oxygen
https://mpm.spbstu.ru/article/2019.71.2/
MPM442_02_poletaev.pdf
RAR
RUS
389-395
Institute for Problems of Mechanical Engineering of the RAS
Bratov
St.Petersburg, Russia
St.-Petersburg State University
Kazarinov
St.Petersburg, Russia
Dynamic fracture of ceramic plates due to impact loading. Numerical investigation
The paper presents comparative numerical analysis of two ceramic materials subjected to impact loading. ZrO2(Y2O3) and Al2O3 ceramics are studied. The main objective of the work is to study influence of various material parameters on ballistic performance of ceramic materials and on characteristics of the dynamic fragmentation process. The applied numerical scheme is based on finite element method and incubation time fracture criterion. Results on fracture surface area, residual impactor velocity, fragment size distribution are reported for the two materials and various impactor velocities.
10.18720/MPM.4242019_3
impact
ceramics
dynamic fracture
fragmentation
FEM
https://mpm.spbstu.ru/article/2019.71.3/
MPM442_03_bratov.pdf
RAR
RUS
396-406
St. Petersburg State Technological Institute (Technical University) (SPbSTI (TU))
Bogdanov
St.Petersburg, Russia
St. Petersburg State Technological Institute (Technical University) (SPbSTI (TU))
Bogdanov
St.Petersburg, Russia
Institute of Problems of Mechanical Engineering of Russian Academy of Sciences
Redkov
St.Petersburg, Russia
Polycrystalline films of phosphors Cd(1-x-y-z) (CuyAgz) ZnxS on the silicon substrate with the silicon carbide buffer layer: structure and properties
Polycrystalline phosphor film Cd(1-x-y-z) (CuyAgz) ZnxS was grown on the surface of the Si/nano-SiC heterostructure obtained by the unique method of substitution of atoms. The structural, phonon (vibrational) properties of the film, as well as its morphology were studied. X-ray phase analysis (XRD) showed that the phase composition is represented by a matrix of solid solution of cubic syngony and impurity phases formed during precipitation: sodium sulfate (Na2SO4) of orthorhombic syngony and sodium cadmium sulfide (Na6Cd7S10) of monoclinic syngony. The Raman spectroscopy (RS) method confirmed the components of the polycrystalline phosphor film, including its phase composition, determined by the X-ray phase analysis method.
10.18720/MPM.4242019_4
phosphor
Сd1-xZnxS
copper
silver
polycrystalline film
Si/(nano)SiC heterostructures
Raman spectroscopy
https://mpm.spbstu.ru/article/2019.71.4/
MPM442_04_sergeeva.pdf
RAR
RUS
407-414
Ioffe Institute
Priadko
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Pulnev
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Kovalev
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Ilin
St.Petersburg, Russia
Rotary actuator control based on tensile force elements made of shape memory Cu-Al-Ni crystals when operated in a cyclic mode
An actuator design and a function scheme are developed. A control algorithm of a cyclic actuator is considered. We provide experimental results on the control algorithm and the actuator. The actuator operating range is 60°. The actuator sped is ~ 1 degree/second. The actuator operating is stable in any rotation angle in operating range.
10.18720/MPM.4242019_5
shape memory effect
Cu-Al-Ni single crystals
cyclic rotary actuator
https://mpm.spbstu.ru/article/2019.71.5/
MPM442_05_priadko.pdf
RAR
RUS
415-422
National Research Tomsk State University
Skripnyak
Tomsk, Russia
National Research Tomsk State University
Kozulyn
Tomsk, Russia
National Research Tomsk State University
Skripnyak
Tomsk, Russia
The influence of stress triaxiality on ductility of α titanium alloy in a wide range of strain rates
This work aimed to evaluate the combined effect of stress triaxiality and strain rate on the tensile behavior of the titanium alloy. The results of experimental studies and numerical modelling of the mechanical behavior of alpha titanium alloys were received and summarized. This paper presents the results of the research of mechanical behavior of titanium alloy VT 5-1 (this is an analog of Ti-5Al-2,25Sn) in a wide range of strain rates (from 0.001 to 1000 1/s) and stress triaxiality (0.0 - 0.6). Specimens of four different shapes were used in experiments to study the deformation and fracture under uniaxial tension, shear. Experimental studies were performed on servo-hydraulic test machine Instron VHS 40/50-20. The model of inelastic deformation and ductile damage criterion were proposed to describe the ductility of the titanium alloy in a wide range of strain rates and stress triaxiality.
10.18720/MPM.4242019_6
experiment
numerical modelling
alpha titanium alloys
https://mpm.spbstu.ru/article/2019.71.6/
MPM442_06_skripnyak.pdf
RAR
RUS
423-435
Peter the Great St. Petersburg Polytechnic University
Vasilyev
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Sokolov
St.Petersburg, Russia
Peter the Great St. Peresburg Polytechnic University
Sokolov
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Rudskoy
Andrey
St.Petersburg, Russia
Investigation and modeling the austenitization kinetics of steels with complex microstructure under continuous heating
An experimental investigation of the austenitization under continuous heating of various microstructures of 8 industrial steel grades with wide range of chemical compositions was carried out. A quantitative mathematical model describing the austenitization kinetics of the steels with complex microstructure and predicting austenite grain size in dependence on the chemical composition, volume fractions of structural components (ferrite, pearlite, bainite, martensite), ferrite grain size and heating rate, was developed. Values of the model empirical parameters were defined basing on the obtained data on kinetics of austenitization, as well as on the measured final austenite grain size. All experiments were performed using the Pocket Jaw unit of the Gleeble 3800 complex. The kinetics of austenitization and the austenite grain size predicted by the developed model are in good agreement with experimental data.
10.18720/MPM.4242019_7
steels
austenitization kinetics
continuous heating
mathematical modeling
https://mpm.spbstu.ru/article/2019.71.7/
MPM442_07_vasilyev.pdf
RAR
RUS
436-444
Tver State University
Zubchaninov
Tver, Russia
Tver State University
Alekseeva
Tver, Russia
Tver State University
Alekseev
Tver, Russia
Tver State Technical University
Gultiaev
Tver, Russia
Modeling of elastoplastic steel deformation in two-link broken trajectories and delaying of vector and scalar material properties
On the basis of a mathematical model of A. A. Il'yushin's theory of elastoplastic processes, numeric calculations are given for programs of experiments in the form of two-link broken strain trajectory. The results of the numeric simulation are compared with the experimental data obtained by authors on the automated test-machine SN-EVM. Delaying of vector and scalar properties is investigated. The instability of magnitude of the trace of delay as a characteristic of the material is shown.
10.18720/MPM.4242019_8
plasticity; complex loading; two-link trajectories; loading process; vector and scalar properties; trace of delay
https://mpm.spbstu.ru/article/2019.71.8/
MPM442_08_zubchaninov.pdf
RAR
RUS
445-454
Institute of Continuous Media Mechanics UB RAS
Garishin
Perm, Russia
Institute of Continuous Media Mechanics UB RAS
Shadrin
Perm, Russia
Foundation Russian Academy of Sciences, Institute of Applied Mechanics RAS
Kornev
Moscow, Russia
Mechanical studies of rubber micro- and nanocomposites promising for the tire industry. Uniaxial and biaxial tests
Complex studies of the mechanical properties of composites based on rubber vulcanizates with various micro and nanofillers (which are already used or intended to be used in the tire industry) were carried out. Testing of composites for uniaxial stretching to rupture allowed us to determine the reinforcing effects of the input of fillers, as well as materials strength and deformability. Cyclic tests for biaxial loading in two mutually perpendicular directions were also carried out. As a result, the effects of softening and the occurrence of induced mechanical anisotropy in filled elastomers under the action of a biaxial load were studied. It was shown that there are no hysteresis losses in the unfilled elastomer, and there is no induced anisotropy. For a filled elastomer, the value of hysteresis and induced anisotropy depend on the type of filler, its concentration and particle size.
10.18720/MPM.4242019_9
rubber
mineral fillers
strength
ultimate strain
biaxial loading
viscouselasticity
softening
induced mechanical anisotropy
https://mpm.spbstu.ru/article/2019.71.9/
MPM442_09_garishin.pdf
RAR
RUS
455-460
Don State Technical University
Chepurnenko
Rostov-on-Don, Russia
Don State Technical University
Savchenko
Rostov-on-Don, Russia
Don State Technical University
Chepurnenko
Rostov-on-Don, Russia
Applied element method in the solution of plane problems in the theory of creep
The article deals with the consideration of creep in the solution of plane problems by the applied element method. The derivation of the resolving equations is given, as well as the solution of the test problem for the cantilever beam. For calculations, the authors developed a program in the Matlab software package.
10.18720/MPM.4242019_10
creep theory
numerical methods
stress-strain state
applied element method
plane problem
https://mpm.spbstu.ru/article/2019.71.10/
MPM442_10_chepurnenko.pdf
RAR
RUS
461-469
Lobachevsky State University of Nizhni Novgorod
Igumnov
Nizhni Novgorod, Russia
Lobachevsky State University of Nizhni Novgorod
Markov
Nizhni Novgorod, Russia
Lobachevsky State University of Nizhni Novgorod
Boev
Nizhny Novgorod, Russia
A static boundary element analysis of 3D anisotropic elastic problems
This paper presents a direct boundary element approach for anisotropic static three-dimensional linear elastic problems. Formulation is based on the use of regularized boundary integral equation (BIE) for displacements. This BIE is weakly singular which is advantageous compared to the traditional strongly singular formulations. The displacement static fundamental solution is expressed in terms of an integral over a circumference with a unit radius. For the efficient numerical implementation of these fundamental solutions an interpolation scheme is used. For the spatial discretization a mixed approximation of geometry and boundary fields is employed. Numerical solutions of the problem of spherical cavity in an infinite elastic medium subjected to the uniform internal pressure are presented for the materials with different degrees of anisotropy.
10.18720/MPM.4242019_11
anisotropic elasticity
static problems
boundary element method
Green's functions
https://mpm.spbstu.ru/article/2019.71.11/
MPM442_11_igumnov.pdf
RAR
RUS
470-483
Peter the Great St. Petersburg Polytechnic University
Ivanova
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Matyas
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Stepanov
St.Petersburg, Russia
Employment of Eulerian, Lagrangian, and arbitrary Lagrangian-Eulerian description for crack opening problem
Numerical study of crack opening in the solid material of rock formation is presented in this article. Initially introduced straight-line crack is widened by increasing internal pressure. The crack shape evolution resembles hydraulic fracturing and is considered as a transient process. Commercial code LS-DYNA was employed to obtain solutions by three types of descriptions, they are compared to the solution obtained in Eulerian description by a program based on the finite-volume method and written in Python language. The main features of the self-developed code are a direct relation between velocities and strains, and a deriving of the aperture through density distribution.
10.18720/MPM.4242019_12
solid mechanics
finite-volume method
numerical simulations
Eulerian description
Lagrangian description
arbitrary Lagrangian-Eulerian description
crack opening
hydraulic fracturing
https://mpm.spbstu.ru/article/2019.71.12/
MPM442_12_ivanova.pdf
RAR
RUS
484-490
Mordovia State University N.P. Ogareva
Ivlev
Saransk, Russia
Mordovia State University N.P. Ogareva
Sigachyov
Saransk, Russia
Mordovia State University N.P. Ogareva
Yudin
Saransk, Russia
Stress relaxation and creep of a composite material based on epoxy resin filled with the hemp boon
Samples of composite material based on epoxy resin and hemp boon as a filler were obtained and studied. The regularities of the processes of mechanical relaxation in this composite material are qualitatively similar to the regularities of these processes in pure cured resin.
10.18720/MPM.4242019_13
composite materials; epoxy resin; relaxation; mechanical stress
deformation
creep
https://mpm.spbstu.ru/article/2019.71.13/
MPM442_13_ivlev.pdf