Materials physics and mechanics

RAR RUS 123-132 59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

Himachal Pradesh University Shimla Sharma

Shimla, India

Himachal Pradesh University Shimla Devi

Shimla, India

Stability of stratified Rivlin-Ericksen (model) fluid in magnetized quantum plasma saturating a porous medium The present investigation is to focus on the quantum effects on the Rayleigh Taylor instability in an infinitely electrically conducting inhomogeneous stratified incompressible, viscoelastic fluid/plasma through a porous medium in the presence of a vertical magnetic field. After developing a mathematical formulation, the linear magneto hydrodynamic equations are solved by normal mode analysis to obtain the velocity perturbation. The linear growth rate is derived for the case when the plasma with exponential density, viscosity, viscoelasticity, quantum parameter distribution is confined between two rigid planes at z = 0, z = d. The behaviour of growth rates with respect to the kinematic viscoelasticity and the simultaneous presence of quantum effect and magnetic field are obtained in the presence of porous medium, the medium permeability and kinematic viscosity. It is observed that the vertical magnetic field beside the quantum effect yield more stability on the considered system. Rayleigh-Taylor instability; viscoelastic; quantum plasma; Rivlin-Ericksen (model) fluid; porous medium; magnetic field https://mpm.spbstu.ru/article/2016.48.1/ MPM227_01_sharma.pdf

RAR RUS 133-141 University of Tartu Kondratiev

Tartu, Estonia

University of Tartu Kink

Tartu, Estonia

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

St.Petersburg, Russia

Transparent films from aluminium-doped zinc oxide fibers prepared by electrospinning method Aluminium doped zinc oxide films were prepared by electrospinning method through deposition of fibers from sol-gel solution on a substrate. Samples were specially annealed after deposition. Several annealing temperatures and heating and cooling rates are examined. Two preparation routes giving both thin fibers with diameter near 40 nm and thick fibers with diameter near 140 nm are elaborated. Samples were characterized by optical spectrophotometry, scanning electron microscopy and energy dispersive X-ray spectroscopy. Light transmittance of prepared films is 85-90 % in the visible spectral range. However transmittance of samples annealed in air is slightly higher than for samples annealed in vacuum. This slight decrease in transmittance can be associated with higher content of carbon in the samples annealed in vacuum. aluminium doped zinc oxide films; electrospinning method; sol-gel solution; fibers https://mpm.spbstu.ru/article/2016.48.2/ MPM227_02_kondratiev.pdf

RAR RUS 142-170 Institute of Problems of Mechanical Engineering RAS Bobylev S.V.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

Processes of nanoscale ideal plastic shear in deformed nanocrystalline materials and nanowires The paper describes theoretical models of plastic deformation based upon a conception of nanoscale ideal shear serving as an alternative to the standard mechanism of lattice dislocation nucleation. A model of new physical mechanism of plastic flow in fcc nanowires through nucleation and evolution of sub-surface nanodisturbances is considered. Also the effect of sub-surface nanodisturbances on deformation nanotwins generation is investigated. The model of lattice and grain-boundary dislocation emission from pores in nanocrystalline materials via nanoscale ideal shear under the action of realistically achievable stresses is proposed. nanocrystalline materials; nanowires; plastic deformation; theoretical models https://mpm.spbstu.ru/article/2016.48.3/ MPM227_03_bobylev.pdf

RAR RUS 171-182 Siberian State Industrial University Sarychev

Novokuznetsk, Russia

Siberian State Industrial University Nevskii

Novokuznetsk, Russia

Siberian State Industrial University Gromov

Novokuznetsk, Russia

Analysis of stress-strain state of surface layers of the surfacing material rate at the contact loads The analysis of stress-strain state on the border "of the deposited surface layer - substrate" methods of the theory of elasticity of inhomogeneous media, when exposed to distributed in a circle of the load. The solution of spatial tasks in the form of a series containing hypergeometric function. The dependences of maximum values of stresses from the linear dimensions of the deposited material. It is shown that the creation of brutal coverage plays a favorable role, reducing the maximum normal stress. stress strain hardened layer surfacing https://mpm.spbstu.ru/article/2016.48.4/ MPM227_04_sarychev.pdf

RAR RUS 183-186 Institute of Problems of Mechanical Engineering RAS Meshcheryakov Yu.I.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Divakov

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Zhigacheva

St.Petersburg, Russia

Оn the structural instabilities of shock loaded materials Experimental examples of shock-induced structural instabilities in solids, which are nucleated in the process of multiscale dynamic deformation, are considered from the position of methods of registration. The criterion for nucleation of instability, which includes the particle velocity variation at the mesoscale, supposes that instability arises when rate of change of the velocity variation within the shock front becomes higher than rate of change of the mean particle velocity. shock loaded materials; structural instabilities https://mpm.spbstu.ru/article/2016.48.5/ MPM227_05_meshcheryakov.pdf

RAR RUS 187-194 FSBEI HPE “Kh.M. Berbekov Kabardino-Balkarian State University” Mikitaev

Nalchik, Russia

FSBEI HPE “Kh.M. Berbekov Kabardino-Balkarian State University” Kozlov

Nalchik, Russia

The mechanisms of reinforcement of nanostructured composites polymer/organoclay with glassy and elastomeric matrix It has been shown that nanostructured composites polymer/organoclay can be divided on three types: microcomposites, intermediate and true nanocomposites. Belonging of composite to any type is defined by organoclay structure. The transition from one type of composite to other one results in strong changes of elastic modulus. The reinforcement degree of nanostructured composites can be described by the same percolation relationship, but having different critical indices. composite; organoclay; reinforcement; structure; percolation; interfacial regions https://mpm.spbstu.ru/article/2016.48.6/ MPM227_06_mikitaev.pdf

RAR RUS 195-204 Zhengzhou University Du

Zhengzhou, China

Zhengzhou University Tie

Zhengzhou, China

Zhengzhou University Li

Zhengzhou, China

Zhengzhou University Zhou

Zhengzhou, China

Numerical and experimental study for damage characterization of composite laminates subjected to low-velocity impact In this paper, the damage evolution and the relationship between damage characterization and impact energy of Carbon/Epoxy composite laminates are discussed. To achieve this purpose, low-velocity impact tests according to ASTM standard are conducted and the data, like impact force, are obtained. Based on ABAQUS / Explicit, a finite element model is established. In the model, the laminate is created by the solid element to better descript the intra-laminar stress and the inter-laminar damage and the cohesive element are introduced to model the interface. By comparing the experiment and simulation, the validity of the simulation is verified. After simulating the impacts with a series of energy values, this paper studies surface pit depth, delamination area and matrix damage area and provides theoretical support for damage research and non-destructive testing. composite laminates; low-velocity impact; damage characterization https://mpm.spbstu.ru/article/2016.48.7/ MPM227_07_tie.pdf

RAR RUS 205-214 Ufa State Aviation Technical University Sitdikov

Ufa, Russia

Ufa State Aviation Technical University Safin

Ufa, Russia

Ufa State Aviation Technical University Khairetdinov

Ufa, Russia

Ufa State Aviation Technical University Raab

Ufa, Russia

Federal State Unitary Enterprise "Apparatus Producing Plant" Nabiulin

Trekhgorny, Chelyabinsk region, Russia

Ufa State Aviation Technical University Bikbulatova

Ufa, Russia

Formation of the structure and properties of a high speed steel tool by severe plastic deformation and subsequent heat treatment Presents the conditions of formation of structure in the high-speed tool steel Р6M5 (Russian standard) using severe plastic deformation (SPD). Integrated processing workpieces included draft initial billets subsequent by high-pressuretorque (HPT) (HPT) at room temperature and heat treatment. The influence of treatment parameters SPD on the structural features of deformed blanks and carbide homogeneity. It is shown that the rational parameters of processing allow to obtain high performance tool steel P6M5. high-speed tool steel; severe plastic deformation; structure; properties https://mpm.spbstu.ru/article/2016.48.8/ MPM227_08_khairetdinov.pdf

RAR RUS 215-222 T-5749-2017 6602123579 0000-0002-2102-1076 Peter the Great St. Petersburg Polytechnic University Kodzhaspirov Georgij kodjaspirov@spbstu.ru

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kamelin

St.Petersburg, Russia

Study of dynamic recrystallization high-strength low-alloyed steel with the use of physical simulation The effect of temperature-strain parameters on the high-strength low-alloy steel dynamic recrystallization kinetics with the use of physical simulation technique has been studied. The recrystallized grain size . temperature and strain relationship has been found. A model for the assessment of dynamically recrystallized grain is presented. physical simulation; dynamic recrystallization; grain structure https://mpm.spbstu.ru/article/2016.48.9/ MPM227_09_kodzhaspirov.pdf