Materials physics and mechanics

RAR RUS 1-7 Anhui University of Technology Ma

Ma'anshan, PR China

Anhui University of Technology Fenineche

Ma'anshan, PR China

Université de Bourgogne Franche-Comté Elkedim

Belfort, France

Anhui University of Technology Moliere

Ma'anshan, PR China

Sr-doping effect on apatite type La10Si6O27 electrolyte: experiments and ab-initio calculation Apatite-type lanthanum silicates draw researchers. attention due to their good performance as electrolyte materials for IT-SOFC (intermediate temperature solid oxide fuel cells). In this paper we present Sr-doping effect on La10Si6O27 (LSO) via experimental method and ab-initio calculation: the samples were prepared through an optimized water-based sol-gel process. High purity, crystallinity compounds with and without Sr-doping LSO are obtained and the resulting materials were characterized by scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. Ionic conductivities and activation energies have been measured after sintering at 1500 °C and the effect of the Sr-doping has been investigated. The results show that the ionic conductivity is thermally activated and values lies between 4.5 x 10-2 and 1 x 10-6 Scm-1 at 873 K as a function of the Sr-doping ratio. The ab-initio calculation work shows the lattice parameter and band structure affected by Sr-doping, leading to the change of macro scope properties. The calculation results of activation energies were consistent with those obtained by experiments. apatite lanthanum silicates; sol-gel; ab-initio calculation; electrolyte; SOFC https://mpm.spbstu.ru/article/2017.54.1/ MPM132_01_ma.pdf

RAR RUS 8-13 Sultan Qaboos University Vakili-Nezhaad

Muscat, Oman

Sultan Qaboos University AlAisaee

Muscat, Oman

Sultan Qaboos University AlJabri

Muscat, Oman

Sultan Qaboos University AlBarwani

Muscat, Oman

Density calculation of ionic liquids Recently, an interest from both academia and industry has been moved toward ionic liquids due to their environmentally friendly characteristics as green alternative for traditional volatile organic solvents (VOCs). In addition, because of their wide range of physicochemical properties they found unique applications in renewable energy sector. For using such substances, one needs reliable correlations for predicting their physical properties. In the present work, a new method for determining the density of ionic liquids has been proposed. It has been shown that density of ionic liquids appears to be correlated linearly with the refractive index parameter of these liquids. An average error of 12.27% for 45 ionic liquids was obtained.Several equations of state were compared with this method including, SRK, RK, Peng Robinson and Riazi and Roomi [1].Using a sample of 29 ionic liquids, average errors of 88.72%, 65.79%,39.10% and 66.07% were obtained for these equations of state, respectively. The estimated values from this method seems to be reasonable and can be applied to determine the density of ionic liquids at any temperature. Density calculation ionic liquids https://mpm.spbstu.ru/article/2017.54.2/ MPM132_02_vakili-nezhaad.pdf

RAR RUS 14-20 Univ. Bourgogne Franche-Comté Lebaal

Belfort, France

Univ. Bourgogne Franche-Comté Chamoret

Belfort, France

Univ. Bourgogne Franche-Comté Schlegel

Belfort, France

Universitatea Transilvania Brasov Folea

Braşov, Romania

Thermal modelling of friction stir process (FSP) and identification parameters The Friction Stir Processing (FSP) is an innovative surface engineering method, considered as a green processing technique. A good physical understanding of the process can be reached by the combined efforts of experimental examination and numerical modelling. In this paper, a three-dimensional heat transfer model for FSP is presented. Then, a numerical inverse method that allows to estimate the Coulomb friction coefficient µ combining experimental test, finite element simulations and optimization is developed. Friction Stir Processing; Heat Transfer Model; Finite Element Simulation; Optimization https://mpm.spbstu.ru/article/2017.54.3/ MPM132_03_lebaal.pdf

RAR RUS 21-30 Assiut University Ali

Assiut, Egypt

Taif University Alzaed

Al-Haweiah, Taif, Kingdom of Saudi Arabia

Residential scale solar driven cooling systems versus conventional air-conditioning in hot arid areas: a comparative study In this study, performance, energy efficiency, cost competitiveness, and global warming assessments of residential scale solar thermal and off-grid Photovoltaic driven DC air-conditioning systems versus conventional AC driven air-conditioning system in hot, arid areas is carried out. The first system is an integrated solar thermal driven residential air-conditioning. This system consists of evacuated tube solar collector arrays of area 36 m2 with high reflective parabolic surface used at the back, a silica gel-water adsorption chiller of 8 kW nominal cooling capacity, and hot and cold-water storage tanks of 1.8 and 1.2 m3 in volume, respectively. While the second system is an off-grid PV electrically driven DC compressor air-conditioning system. This system is a split air-conditioning unit with a cooling capacity of (26000 BTU) 7.62 kW that requires an input power of 1.8 kW with R410a (1550) refrigerant. Those solar-driven systems are compared with a grid connected AC driven vapor compression Air-Conditioning having 8 kW nominal cooling capacity. Experimental results show that the indoor thermal comfort conditions are achieved in the hottest days of the year for space with a floor area of 80 m2 with 14 residences for both systems. Comparison between the systems is based on the lifespan of 20 years, cooling capacity 8 kW and 18 hours' daily operation in the cooling session. The results clearly indicate that: Compared with conventional vapor AC driven air-conditioning system, the solar thermal driven cooling system has an energy consumption of 10.94%, with the Total Equivalent Warming Impact (TEWI) of 9.96% while the cost per kW cooling is higher by 295.96%, respectively. While, the off-grid PV driven DC air conditioning system has an energy consumption of 0%, with TEWI of 0.65% and cost per kW cooling is lower by 54.88%, respectively. Therefore, the off-grid PV electrically driven DC compressor air-conditioning system can be recommended for use in the residential sector based on its low cost per kW cooling, no grid energy consumption, and very low environmental impact on global warming. However, this system further cost reduction can be cut from the energy storage, battery subsystem, in case this system is on-grid connected. residential scale solar thermal air-conditioning system; Photovoltaic driven air-conditioning system; Global warming assessments and Cost Competitiveness. https://mpm.spbstu.ru/article/2017.54.4/ MPM132_04_ali.pdf

RAR RUS 31-42 University of Science and technology Mohamed Boudiaf Hamel

El M’Naouer, Algeria

University of Science and technology Mohamed Boudiaf Bencherif M.M.

El M’Naouer, Algeria

University of Science and technology Mohamed Boudiaf Hamidou

El M’Naouer, Algeria

Investigation of a twin entry mixed flow turbine volute, benefits with regard to the eco-system Mixed-inflow turbines are suitable for many applications, where compact power sources are required with higher boost pressure. Realizing the growing importance and availability of road vehicles operating over wide range of speeds and loads, our point of particular interest must be a reduction of gas pollutants which could be achieved by exploring different design possibilities in order to increase the machine efficiency. This will certainly lead to a decrease in fuel consumption resulting in a fall of C02 gas emission amount. This paper focuses on the performance predictions of a turbocharger Twin-entry mixed inflow turbine. The ANSYS-CFX code is used to solve the equations of a viscous, compressible, turbulent, highly unsteady and three dimensional turbine inflow. The computed results agree reasonably well with experimental data. Twin-entry turbine provides the best compromise in terms of performances at different pressure ratio, and significant increase in swallowing capacity probably due to the better flow guidance, a more uniform thermodynamic parameters and Mach number around the rotor inlet. mixed inflow turbine; twin-entry volute; C02 emission; pulsed flow https://mpm.spbstu.ru/article/2017.54.5/ MPM132_05_hamel.pdf

RAR RUS 43-50 ITMO Univesity Liubimova

St.Petersburg, Russia

University of Balearic Islands Corró

Palma de Mallorca, Spain

University of Balearic Islands Torrens-Serra

Palma de Mallorca, Spain

Universidad Pública de Navarra (UPNA) Recarte

Pamplona, Spain

Universidad Pública de Navarra (UPNA) Pérez-Landazábal

Pamplona, Spain

Universitat de les Illes Balears Kustov

Palma de Mallorca, Spain

Scaling of low field magnetoelastic hysteresis in antiferromagnetic Dy We investigate reversible inverse magnetostriction in order to study scaling properties of magnetic hysteresis in the helical antiferromagnetic phase of polycrystalline Dy. We argue that the experimental method used is more sensitive than studies of conventional magnetic hysteresis. This advantage allows us to study hysteretic properties of antiferromagnetic Dy over the temperature ranges, not accessible previously. We introduce generalized coercivity of magnetoelastic hysteresis and show that it demonstrates, under different experimental protocols, the same exponents of scaling power laws in the ferro- and antiferromagnetic phases. The similarity of hindering mechanisms impeding the mobility of domain walls in antiferromagnetic and ferromagnetic phases is suggested as the reason of the observed universality of hysteresis scaling. polycrystalline Dy; helical antiferromagnetic phase; magnetic hysteresis; reversible inverse magnetostriction https://mpm.spbstu.ru/article/2017.54.6/ MPM132_06_liubimova.pdf

RAR RUS 51-57 National University of Science and Technology “MISIS” Klimont

Moscow, Russia

National University of Science and Technology “MISIS” Stakhanova

Moscow, Russia

National University of Science and Technology “MISIS” Galimzyanov

Moscow, Russia

TEEMP LLC Uryupina

Moscow, Russia

National University of Science and Technology “MISIS” Semushin

Moscow, Russia

National University of Science and Technology “MISIS” Krechetov

Moscow, Russia

National University of Science and Technology “MISIS” Kundu

Moscow, Russia

National University of Science and Technology “MISIS” Astakhov

Moscow, Russia

Flexible polyaniline coated carbon cloth as binder-free electrode material for symmetric supercapacitor application Nano-structured polyaniline (PANI) containing composite electrodes based on Busofit T-040 carbon cloth (CC) with high specific surface area have been developed for symmetric supercapaitor devices by one-step chemical polymerization of aniline. The capacitive performance of the CC as well as the PANI/CC composites was characterized by the cyclic voltammetry (CV) and the galvanostatic charge-discharge in H2SO4-based aqueous electrolyte. A PANI/CC composite demonstrates significant capacitance enhancement up to 222 F g-1 and 6,7 F cm-2 (vs. 120 F g-1 and 3,1 F cm-2 for CC). The coulomb efficiency of the composites has been measured to be about 97-99 %. The technological simplicity, easy to scale up and the electrochemical performance of the flexible binder-free PANI/CC electrodes demonstrate the significance of this work for industrial application. Nano-structured polyaniline; carbon cloth https://mpm.spbstu.ru/article/2017.54.7/ MPM132_07_klimont.pdf

RAR RUS 58-73 Peter the Great St. Petersburg Polytechnic University Kurapova

St.Petersburg, Russia

Institute Silicate Chemistry of Russian Academy of Science Konakov V.G.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Grashchenko

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Novik

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Golubev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Orlov

St.Petersburg, Russia

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

St.Petersburg, Russia

Structure and microhardness of two-layer foils of nanotwinned copper with graphene nanoinclusions Two-layer foils of nanotwinned copper with graphene nanoinclusions were fabricated by electrochemical deposition from 1M CuSO4*6H2O aqueous solution containing graphene-graphite mixture stabilized by non-ionic surfactants (Pluronic F-127 and Polyacrilic acid - PAC). The microstructure of the outer foils surface was examined by Scanning Electron Microscopy, the microstructure of the inner foils surface was characterized by Atomic Force Microscopy. XRD analysis proved that the deposition of the thin copper layer on the wafer in case of suspension stabilized by Pluronic F-127 surfactant results in the nanotwinned copper growth. Raman Spectroscopy showed that the use of stabilized suspensions provides the graphene insertion into the foils in a form of nanoinclusions i.e. flakes with 4-6 graphene layers. The amount of graphene in the foils depends on the composition of the graphenegraphite suspension and on the surfactant type. Nanoindentation tests were carried out for both inner and outer surfaces of the foils. The microhardness of inner surface of the foils fabricated using the suspension stabilized by Pluronic F-127 surfactant lies in the range of 2 to 3 GPa, while the elastic modulus exceeds 100 GPa. two-layer foils of nanotwinned copper; graphene nanoinclusions; structure; microhardness https://mpm.spbstu.ru/article/2017.54.8/ MPM132_08_kurapova.pdf

RAR RUS 74-82 Peter the Great St. Petersburg Polytechnic University Romashkina (Zobacheva)

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nemov Alexander

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Borovkov A.I.

St.Petersburg, Russia

Multiscale simulations of novel additive manufactured continuous fiber-reinforced three-component composite material The paper is dedicated to simulation of novel three-component composite material obtained by layer-by-layer 3D printing mechanical behavior on the basis of detailed reproduction of its microstructure. Results of numerical study of the microstructure parameters influence on the mechanical characteristics of the composite material produced by 3D printing are presented and discussed. fiber-reinforced three-component composite material; multiscale simulations; microstructure parameters; mechanical characteristics; 3D printing https://mpm.spbstu.ru/article/2017.54.9/ MPM132_09_zobacheva.pdf

RAR RUS 83-87 Ioffe Institute Priadko

St.Petersburg, Russia

Ioffe Institute Nikolaev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Pulnev

St.Petersburg, Russia

Ioffe Institute Stepanov

St.Petersburg, Russia

Ioffe Institute Rogov

St.Petersburg, Russia

Ioffe Institute Chikiryaka

St.Petersburg, Russia

Ioffe Institute Shmakov

St.Petersburg, Russia

Shape memory Cu-Al-Ni single crystals for application in rotary actuators Physical and technical potential of shape memory single crystals for applications in rotary actuators was experimentally studied. Single-crystalline Cu-Al-Ni cylindrical rods for tests and actuator applications were grown from melt by Stepanov method. The crystals were tested by tension under conditions simulating their work in the proposed design of a rotary actuator. Actuator performance parameters such as rotation angle, torque and useful work were estimated basing on experimental results. Actuators employing shape memory effect outperform conventional electric motors and actuators in terms of specific work output. Cu-Al-Ni single crystal; shape memory; rotary actuator https://mpm.spbstu.ru/article/2017.54.10/ MPM132_10_priadko.pdf

RAR RUS 88-93 Ioffe Institute Timoshkov

St.Petersburg, Russia

Ioffe Institute Bazhenov

St.Petersburg, Russia

Ioffe Institute Mynbaev

St.Petersburg, Russia

A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of RAS Varavin

Novosibirsk, Russia

A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of RAS Yakushev

Novosibirsk, Russia

A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of RAS Mikhailov

Novosibirsk, Russia

A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of RAS Dvoretsky

Novosibirsk, Russia

Photoluminescence of Hg0.5Cd0.5Te structures grown with molecular-beam epitaxy Photoluminescence (PL) of Hg1-xCdxTe-based (x ~ 0.5) structures grown with molecular-beam epitaxy on GaAs and Si substrates was studied. The studied structures appeared to have substantial compositional fluctuations, which at low temperatures (T < 200 K) strongly affected the value of "optical" bandgap obtained in the experiment. Comparison of the experimental results with the data available in the literature showed that such fluctuations were in general typical of Hg1-xCdxTe with x ~ 0.5 fabricated with various technologies. At T > 200 K the effect of the fluctuations on the optical properties of the studied material became negligible, which confirmed that the structures were suitable for fabrication of photo-electronic devices operating in the extended short-wave infrared range. photoluminescence; Hg0.5Cd0.5Te structures; molecular-beam epitaxy https://mpm.spbstu.ru/article/2017.54.11/ MPM132_11_timoshkov.pdf

RAR RUS 94-101 FSBEI HPE “Kh.M. Berbekov Kabardino-Balkarian State University” Kozlov

Nalchik, Russia

FSBEI HE “Kh.M. Berbekov Kabardino-Balkarian State University” Dolbin

Nalchik, Russia

Structural aspects of reinforcement of nanostructured composites polymer/2D-nanofiller It has been shown that within the frameworks of the percolation model of reinforcement polymer nanostructured composites can be divided onto three classes: true and intermediate nanocomposites and microcomposites also, moreover the same composite can be fall under the different classes depending on 2D-nanofiller content (its structure). The effective moduli of elasticity of 2D-nanofiller and interfacial regions are reduced substantially in the indicated sequence that defines reduction of total modulus of elasticity of these nanomaterials. The modified rule of mixtures, operating by real, but not nominal characteristics of composite components, describes correctly the modulus of elasticity of nanostructured composites. At other equal conditions this parameter is defined fully by the transfer of mechanical stress efficiency on interfacial boundary polymer matrix - 2D-nanofiller. nanostructured composite; 2D-nanofiller; reinforcement degree; modulus of elasticity; interfacial boundary; stress transfer https://mpm.spbstu.ru/article/2017.54.12/ MPM132_12_kozlov.pdf