Materials physics and mechanics

RAR RUS 491-501 Kuban State University Glushkov

Krasnodar, Russia

Kuban State University Glushkova

Krasnodar, Russia

Kuban State University Eremin

Krasnodar, Russia

Kuban State University Miakisheva

Krasnodar, Russia

Ultrasonic inspection of anisotropic laminate plates immersed in acoustic medium The use of air-coupled or submerged transducers for the ultrasonic inspection of composite plates involves the development of adequate mathematical and computer models for simulating the occurring wave processes. In achieving this goal, an analytically based computer model has been developed. On this base, the directivity of the source-generated wave fields caused by the anisotropy of an immersed composite plate as well as the influence of fluid loading is investigated. A series of numerical examples illustrating angular dependence and independence of the wavenumbers, attenuations and amplitude factors of the waves of different kinds excited in the coupled source-fluid-plate structures are presented and discussed. Keywords: 10.18720/MPM.4252019_1 immersed anisotropic plate acoustic fluid integral and asymptotic representations guided waves https://mpm.spbstu.ru/article/2019.72.1/ MPM542_01_glushkov.pdf

RAR RUS 502-510 Annamalai University Thirumaran

India

Annamalai University Priyadharsini

India

SBM College of Engineering & Technology Karthikeyan

India

Ultrasonic investigation on elastic and mechanical properties of borate doped glass specimen The present work divulges about ultrasonic characterization on the elastic and mechanical properties of borate doped ternary glass systems. The Ultrasonic wave velocity (longitudinal and shear) and density for the two ternary (B2O3-WO3-Bi2O3) BTB and (B2O3-SiO2- Bi2O3) BSB glass systems have been measured at room temperature by using Pulse–Echo technique at 5 MHz. The glass samples were prepared by melt-quenching method. The measured experimental values have been utilized to evaluate the Elastic modulus, Poisson’s ratio, Acoustic Impedance, Debye Temperature, and Thermal Expansion Coefficient. The incorporation of heavy metal ion in BTB glass system is attributing for its decrease of most of its parameters. The elevation of Debye Temperature in this study advocates structural rigidity and compactness of BSB glass system over BTB glass system. The trends of other evaluated parameters supporting this. The UV-Vis (DRS) study on the band gap energies of these glass specimens confirming their amorphous nature and suggesting their nature of rigidity. 10.18720/MPM.4252019_2 Poisson's ratio Acoustic impedance Debye temperature Thermal expansion Coefficient Elastic Modulus https://mpm.spbstu.ru/article/2019.72.2/ MPM542_02_thirumaran.pdf

RAR RUS 511-516 Tokushima University Okazaki

Tokushima, Japan

Tokushima University Ishii

Tokushima, Japan

Tokushima University Furube

Tokushima, Japan

Femtosecond transient absorption spectroscopy of maghemite nanoparticles loaded with gold nanoparticles Photocatalytic water splitting is very useful for solar energy conversion. Iron oxides are attracting a lot of interests due to absorption in the visible region. However, iron oxides have poor conductivity. As one of solutions, the photocatalytic performance may be enhanced with loaded gold nanoparticles (Au-NP) by the characteristic optical absorption and the charge trapping nature. In this study, hybrid material of maghemite (γ-Fe2O3) and Au-NP (denoted as Au-Fe2O3) was prepared and the photo-generated carrier dynamics was revealed by femtosecond transient absorption (TA) spectroscopy. The hybrid material was prepared by mixing maghemite powder into 40 nm Au-NP aqueous solution. TA decay of Au-Fe2O3 indicates faster decay and suggests occurrence of hole transfer from maghemite to Au-NP, which can suppress the charge recombination and may result in enhancement of the photocatalytic reactivity. 10.18720/MPM.4252019_3 transient absorption spectroscopy iron oxide Au nanoparticles photocatalyst https://mpm.spbstu.ru/article/2019.72.3/ MPM542_03_okazaki.pdf

RAR RUS 517-521 Lobachevsky State University of Nizhni Novgorod Lamzin

Nizhny Novgorod, Russia

Lobachevsky State University of Nizhni Novgorod Lomunov

Nizhni Novgorod, Russia

Saint Petersburg State University Konstantinov

St.Petersburg, Russia

Investigation of strength and time properties of lime-sand brick under dynamic loading The results of experimental study of mechanical properties of samples of sand-lime brick under dynamic loading are presented. The tests were carried out using the traditional Kolsky method and its modification - dynamic splitting (the so-called «Brazilian test»). The laws of change in strength and time properties of the investigated material are determined in the strain rate range of 3·102-2.5·103 s-1 under compression and in the stress rate range of 2·101-3·102 GPa/s under tension. 10.18720/MPM.4252019_4 sand-lime brick dynamic loading high-speed deformation experiments identification of model parameters https://mpm.spbstu.ru/article/2019.72.4/ MPM542_04_lamzin.pdf

RAR RUS 522-527 Kyushu Institute of Technology Takaki

Japan

Kyushu Institute of Technology Noda

Japan

Kyushu Institute of Technology Shen

Japan

Kyushu Institute of Technology Inoue

Japan

Kyushu Institute of Technology Sano

Japan

Kyushu Institute of Technology Takase

Japan

The strain rate concentration factor for round and flat test specimens In this study, the strain rate concentration is considered for high speed tensile test, which is now being recognized as a standard testing method. To evaluate the impact strength of engineering materials, Izod and Charpy tests are unsuitable since they cannot control the impact speeds and therefore the testing results do not coincide with the real failure of real products. For smooth specimens, the strain rate can be determined from the tensile speed u/t and specimen length l as ε̇smooth=u/tl. For notched specimens, however, the strain rate at the notch root ε̇notch should be analyzed accurately. In this study, therefore, the strain rate concentration factor defined as Kt ε̇ = ε̇notch/ε̇smooth is studied with varying the notch geometry and specimen length for round and flat test specimens. In particular, the relationship between the strain rate concentration factor and the stress concentration factor is investigated by varying the notch geometry and specimen length. 10.18720/MPM.4252019_5 notch fracture high speed tensile test strain rate concentration factor stress concentration factor https://mpm.spbstu.ru/article/2019.72.5/ MPM542_05_takaki.pdf

RAR RUS 528-534 Tver State University Zubchaninov

Tver, Russia

Tver State University Alekseev

Tver, Russia

Tver State Technical University Gultiaev

Tver, Russia

Tver State University Alekseeva

Tver, Russia

Modeling of elastoplastic deformation of structural steel by a trajectory containing three circles touching internally To verify the mathematical model of the theory of processes, numerical calculations of the complex elastoplastic deformation of St3 steel along a flat curvilinear strain trajectory under combined tension-compression with torsion were carried out. The numerical calculations are compared with the experimental data obtained by the authors on the experimental complex SN-EVM on thin-walled tubular specimen. It is shown that the used mathematical model qualitatively and quantitatively satisfactorily describes the main effects of complex plastic deformation for the class of strain trajectories under consideration. 10.18720/MPM.4252019_6 plasticity complex loading modeling of processes strain trajectory mechanical tests tubular specimen https://mpm.spbstu.ru/article/2019.72.6/ MPM542_06_zubchaninov.pdf

RAR RUS 535-543 Kabardino-Balkarian State University named after H.M. Berbekov Slonov

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Zhansitov

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Rzhevskaya

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Khakulova

Nalchik, Russia

Kabardino-Balkarian State University named after H.M. Berbekov Khashirova

Nalchik, Russia

On the plasticization of highly-filled polyphenylene sulfoney The paper presents the results of a study of the plasticizing effect of oligomers based on 4.4'-dihydroxydiphenyl and 4.4'-dichlorodiphenylsulfone, as well as 4.4.-dihydroxydiphenylpropane (Diane) and 4.4'-dichlorodiphenylsulfone on polyphenylene sulfone and highly filled composites on its basis. It was established that these oligomers are quite effective plasticizers during processing, increasing the melt flow rate and retaining elastic-strength properties at concentrations up to 20%. At the same time, they have high heat resistance and the necessary compatibility with the matrix polymer. 10.18720/MPM.4252019_7 polyphenylene sulfone composite material glass fiber carbon fiber plasticization oligomer https://mpm.spbstu.ru/article/2019.72.7/ MPM542_07_slonov.pdf

RAR RUS 544-557 Institute of Computational Modeling SB RAS Sadovskii

Krasnoyarsk, Russia

Institute of Computational Modeling SB RAS Sadovskaya

Krasnoyarsk, Russia

Siberian Federal University Efimov

Krasnoyarsk, Russia

Analysis of seismic waves excited in near-surface soils by means of the electromagnetic pulse source "Yenisei" The northern territories of Eastern Siberia are characterized by a permafrost-taiga structure of the surface layer of soil, which reduces the efficiency of geological exploration using seismic sources of explosive and vibratory types. Therefore, Geotech Holding Company developed a special eco-friendly electromagnetic pulse source "Yenisei", which seismic waves are the subject of analysis using high-performance computing in this paper. Computational technology, worked out previously for solving the problems of the dynamics of viscoelastic, elastic-plastic, granular and porous media, is applied to the analysis of wave motion of a soil near a point of perturbations. It is shown that the main frequency of generated strain waves substantially depends on the elastic characteristics of a soil in the near-surface zone. A comparison of the results of computations obtained in the framework of the model of static loading with instant unloading and the model taking into account the monotone loading stage with subsequent pressure relief showed the validity of the hypothesis about the presence of added mass of a soil under the loading platform. This mass accumulates impact energy and emits seismic waves due to oscillatory motion. 10.18720/MPM.4252019_8 blocky-layered geomedium electromagnetic pulse source seismic oscillations elastic waves parallel computational algorithm supercomputer modeling https://mpm.spbstu.ru/article/2019.72.8/ MPM542_08_sadovskii.pdf

RAR RUS 558-563 7006355365 0000-0002-6663-6357 Kuban State University Babeshko Vladimir

Krasnodar, Russia

57201387701 Southern Scientific Center RAS Evdokimova Olga

Rostov-on-Don, Russia

6602333282 0000-0003-1283-3870 Kuban State University Babeshko Olga

Krasnodar, Russia

Kuban State University Shestopalov

Krasnodar, Russia

57212310668 Kuban State University Evdokimov Vladimir

Krasnodar, Russia

Mechanical aspects of the behavior of the surface of coated bodies when exposed to corrosive liquid The block element method is used to study the behavior of a coated material under the assumption that the surface is exposed to a corrosive liquid medium that can destroy the coating. It is assumed that the destruction begins with the formation of vertical local cracks in the coating, which then grow and lead to the exposure of the unprotected surface. Assuming the possibility of modeling a liquid layer by shallow water equations, the block structure including a body in the form of a deformable layer, a defective coating modeled by Kirchhoff plates and a heavy liquid layer is investigated. The distribution of stress concentration in such a block structure is studied. The analysis showed that even in the presence of a liquid, the features of the stress-strain state of the material inherent in the case of its absence are preserved. The conditions both allowing further use of such object and excluding this possibility are revealed. 10.18720/MPM.4252019_9 block element plates topology differential factorization methods exterior forms block structures boundary problems starting earthquakes hidden defects https://mpm.spbstu.ru/article/2019.72.9/ MPM542_09_babeshko.pdf

RAR RUS 564-581 Institute of the Applied Mechanics Russian Academy of Science Lurie

Moscow, Russia

Institute of the Applied Mechanics Russian Academy of Science Belov

Moscow, Russia

Institute of Applied Mechanics of Russian Academy of Science Volkov-Bogorodskii

Moscow, Russia

Variational models of coupled gradient thermoelasticity and thermal conductivity We consider generalized variational non-local models of media with fields of defects and show that the methods of continuum mechanics are very effective in modeling connected reversible and irreversible thermomechanical processes. It is postulated that the tensor of free distortions is determined only by the spherical tensor, which is interpreted as a dilatation associated with a change in temperature. A variational model of coupled thermoelasticity and hyperbolic thermal conductivity is under construction. It describes the general case of non-locality, when gradient properties are determined by scale parameters that are responsible for both mechanical and temperature effects. The analysis of boundary value problems is given, the physical interpretation of all model parameters is given through known thermomechanical parameters. We also offer a variation model of irreversible thermodynamic processes, which is based on the principle of L.I. Sedov. In this case, the variation form for the dissipative part of the change in energy is based on the non-integrability condition proposed by the authors. 10.18720/MPM.4252019_10 non-local models defective media free dilatation variational models extended thermodynamics irreversible processes dissipation model coupled thermoelasticity and thermal conductivity physical model thermo-resistance https://mpm.spbstu.ru/article/2019.72.10/ MPM542_10_lurie.pdf

RAR RUS 582-595 Institute of Problems of Mechanical Engineering RAS Freidin A.B.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Izmaylova

St.Petersburg, Russia

On a configurational force driving surface growth of solids Surface growth of solids includes a wide variety of processes starting from additive manufacturing technologies and ending with plenty of biological problems. Model of surface growth based on the expression of the configurational force, derived from fundamental laws and entropy inequality, is offered in the present paper. A new expression for the configurational force called surface growth force, which controls growth and resorption, is used. Analysis of the applicability of the developed model was carried out for problems of surface growth of compressed cylinder with prestrained growth layer and growth layer without prestrain. The influence of matter supply function and mechanical stresses as one of the main process controlling factors on the surface growth was also investigated. 10.18720/MPM.4252019_11 configurational force growth surface growth tensor biomechanics https://mpm.spbstu.ru/article/2019.72.11/ MPM542_11_freidin.pdf

RAR RUS 596-601 Lobachevsky State University of Nizhni Novgorod Igumnov

Nizhni Novgorod, Russia

Don State Technical University Petrov

Rostov-on-Don, Russia

Lobachevsky State University of Nizhni Novgorod Belov

Nizhni Novgorod, Russia

Lobachevsky State University of Nizhni Novgorod Mironov

Nizhny Novgorod, Russia

Lobachevsky State University of Nizhni Novgorod Lyubimov

Nizhny Novgorod, Russia

Lobachevsky State University of Nizhni Novgorod Dianov

Nizhny Novgorod, Russia

Numerically-analytically studying fundamental solutions of 3-D dynamics of partially saturated poroelastic bodies A mathematical model of a porous material is considered, in which an elastic skeleton and two fluid phases filling the pores are discerned. The dynamic equations are written in Laplace-type representation for unknown displacement functions of the skeleton and pore pressures of the fillers. The fundamental solutions of the defining differential equations are numerically-analytically studied. A solution in the time-domain is constructed, using the time-step method of numerically inverting Laplace transform. 10.18720/MPM.4252019_12 elastic diffusion unsteady problems Green's functions integral transformations https://mpm.spbstu.ru/article/2019.72.12/ MPM542_12_igumnov.pdf

RAR RUS 602-608 Mechanical Engineering Research Institute, Russian Academy of Science Sarafanov

Nizhni Novgorod, Russia

0000-0002-0437-8540 Mechanical Engineering Research Institute, Russian Academy of Science Perevezentsev

Nizhni Novgorod, Russia

Nonlinear dynamics of serrated deformation of metals at low temperatures The mode of the serrated deformation is investigated mathematically in framework of the thermoactivation model of unstable plastic deformation in metals at low temperatures. The obtained solutions in the framework of known models, however, do not fully correspond to experimental situation, as the stress oscillations in reality are usually irregular and inhomogeneous. By this reason, additionally, the elastic correlations of neighboring deformation zones were taken into account in the model. Numerical analysis model showed that time dependence of the stress, temperature and plastic deformation rate acquires an irregular stochastic character and is represented as an attractive set of trajectories in the phase space of these variables - "strange attractor". 10.18720/MPM.4252019_13 thermomechanical instability serrated plastic deformation low temperatures relaxation self-oscillations https://mpm.spbstu.ru/article/2019.72.13/ MPM542_13_sarafanov.pdf

RAR RUS 609-616 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 Zisman

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kolbasnikov

St.Petersburg, Russia

Combined effect of boron alloying and ausforming on austenite transformation in low carbon steels under continuous cooling The combined effect of boron addition and ausforming on the structure of low carbon low alloyed steel after the transformation of austenite has been investigated in a wide range of cooling rates. It is shown that boron hinders formation of polygonal ferrite in continuous cooling regardless of austenite predeformation and suppresses appearance of acicular ferrite. A qualitative explanation of this effect is proposed in terms of the deformation induced boron segregation on boundaries of austenite grains and subgrains. Practical significance of the obtained results is discussed in application to the thermomechanical treatment of the considered steels. 10.18720/MPM.4252019_14 steel austenite transformation deformation boron microstructure https://mpm.spbstu.ru/article/2019.72.14/ MPM542_14_vasilyev.pdf

RAR RUS 617-624 Universitas Pendidikan Indonesia Winarno

Indonesia

Institut Teknologi Sepuluh Nopember Firdaus

Indonesia

3SMA Taruna Bakti Afifah

Indonesia

The effect of conductivity and permittivity on propagation and attenuation of waves using FDTD The purpose of this study was to investigate the effect of conductivity and permittivity on wave propagation and attenuation on the plate using FDTD (The Finite Difference Time Domain). The FDTD method is used to describe electromagnetic waves. The method used in this study was the basic principle of the numerical approach of differential equations by taking into account boundary conditions, stability, and absorbing boundary conditions. The results of the simulation showed that if the permittivity of the material increased, the propagation would increase as well; however, the attenuation would decrease exponentially. If material conductivity increased, propagation and attenuation would increase. Attenuation and propagation produced the same value when the permittivity value was 2. This simulation could be used to select materials and identify physical phenomena related to electromagnetic waves. 10.18720/MPM.4252019_15 conductivity permittivity propagation attenuation FDTD https://mpm.spbstu.ru/article/2019.72.15/ MPM542_15_winarno.pdf

RAR RUS 625-636 Peter the Great St. Petersburg Polytechnic University Andreeva

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Berkovich

St.Petersburg, Russia

0000-0003-0041-9971 Peter the Great St. Petersburg Polytechnic University Bykov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kozyrev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Lukin

St.Petersburg, Russia

Heating and destruction of biological tissue by high-inensity focused ultrasound Processes of heating and destruction of the breast fat tissue under the action of focused high-intensity ultrasound generated by a 128-element transducer are considered. The simulation of a thermal problem is carried out by anumerical solution of the heat transfer equation. The acoustic pressure field in the tissue is calculated using the Rayleigh integral. A system of dimensionless scaling parameters is proposed to describe the non-stationary process of heat propagation. The influenceof the space localization of foci in a series of pulses on the lesion size is analyzed. The results demonstrate the advantages of a tissue processing program withspatially divergingfocal points of pulses, consisting in a more uniform heating of the tissue and the formation of a continuous ablation area. The impact of the perfusion process on the lesion size is considered. 10.18720/MPM.4252019_16 high-intensity focused ultrasound tumor ablation heat transfer equation heat propagation in tissue https://mpm.spbstu.ru/article/2019.72.16/ MPM542_16_andreeva.pdf

RAR RUS 637-645 Università dell'Aquila dell'Isola

Italy

Università dell'Aquila Giorgio

Italy

Università dell'Aquila Placidi

Italy

Università dell'Aquila Spagnuolo

Italy

PIMM, UMR 8006 CNRS- Arts et Métiers Paris-Tech Peyre

Paris, France

PIMM, UMR 8006 CNRS- Arts et Métiers Paris-Tech Dupuy

Paris, France

PIMM, UMR 8006 CNRS- Arts et Métiers Paris-Tech Dirrenberger

Paris, France

Warsaw University of Technology Pawlikowski

Warsaw, Poland

Lobachevsky State University of Nizhni Novgorod Igumnov

Nizhni Novgorod, Russia

Pantographic metamaterials: a view towards applications The purpose of this article is to show the basic characteristics of the so-called pantographic metamaterial. Here we underline how the microstructure provides some exotic properties and, in principle, implies the second gradient nature of this type of metamaterial. Thanks to the development of additive manufacturing technology (especially in the field of metallurgy) we are now able to produce real samples and carry out experimental measurements to validate the proposed models. In this article we show some new experimental tests, obtained by considering pantographic structures printed in stainless steel. Numerical simulations are briefly shown to show the validity of the theoretical model developed to describe the pantographic metamaterial. Keywords: pantographic metamaterials, second gradient. 10.18720/MPM.4252019_17 pantographic metamaterials second gradient theory multi-scale models homogenization https://mpm.spbstu.ru/article/2019.72.17/ MPM542_17_francesco.pdf

RAR RUS 646-655 Lund Univeristy Johansson

Lund, Sweden

Lund Univeristy Hansson

Lund, Sweden

Lund Univeristy Ahadi

Lund, Sweden

Lund Univeristy Melin

Lund, Sweden

Shear anisotropy in Si-Cu interfaces on the atomic scale Three dimensional molecular dynamics (MD) is used to model the mechanical response at the interface between a thin Cu coating resting on a base of Si. The copper coating is subjected to a displacement controlled shear load and the atom movements at the Si-Cu interface are monitored to investigate the effects of crystallographic anisotropy. The two crystals have the same crystallographic orientation, and two different interface normal directions are considered. The shear load is applied along different crystallographic directions to highlight the importance of crystallographic orientation for the mechanical response. The simulations are performed with the 3D MD free-ware LAMMPS. As the imposed displacement reaches a high enough magnitude, the Cu coating starts to slide over the Si base. Thus the atoms at the interface rearrange depending on loading direction and crystallographic orientation. 10.18720/MPM.4252019_18 Cu-coated Si thin layers 3D molecular dynamics shear induced displacements interface reorganazation crystallographic anisotropy https://mpm.spbstu.ru/article/2019.72.18/ MPM542_18_johansson.pdf

RAR RUS 656-670 National Research University of Technology (BMSTU) Vasilyev

Moscow, Russia

National Research University of Technology (BMSTU) Volkov

Moscow, Russia

National Research University of Technology (BMSTU) Bredihina

Moscow, Russia

BMSTU Pleshcheev

Moscow, Russia

Construction of stress-strain curves for aviation materials database formation This paper discusses specific aspects of elasto-plastic behavior of various materials. It was shown, that during tensile test additional measurements are necessary for constructing stress-strain diagram. Concept of minimal stress-strain curve is presented. Issues and difficulties arising in obtaining and minimal stress-strain curve are discussed. Methods of obtaining statistically valid engineering and true stress-strain curves are introduced. 10.18720/MPM.4252019_19 stress-strain diagram true stress digital image correlation method https://mpm.spbstu.ru/article/2019.72.19/ MPM542_19_vasilyev.pdf

RAR RUS 671-689 Institute of Machinery and Metallurgy of the Far-Eastern Branch Russian Academy of Sciences Abashkin