Materials physics and mechanics

RAR RUS 1-10 Institute Silicate Chemistry of Russian Academy of Science Konakov V.G.

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Golubev

St.Petersburg, Russia

Institute Silicate Chemistry of Russian Academy of Science Solovyeva E.N.

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Archakov

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Borisova

St.Petersburg, Russia

Federal State Unitary Enterprise Smolensk Production Association “ANALITPRIBOR”, Shorokhov

Smolensk, Russia

Agglomerate Size in Precursors and Mechanical Strength of Solid Electrolytes Based on Y2O3-ZrO2, Ce2O3-ZrO2 and Ce2O3-Y2O3-ZrO2 Systems Precursor powders with controlled average agglomerate size in the range of 40- 12000 nm were synthesized using the reverse precipitation sol-gel. The correlation between the agglomerate size and mechanical strength of the final ceramics synthesized from these precursor powders and the content of Ce3+ and Ce4+ in the precursors was studied using BET, XRD, TEM, PSD, and DSC methods. nanoceramics; precursor powders; dispersity; sol-gel synthesis; solid electrolytes; mechanical strength https://mpm.spbstu.ru/article/2012.22.1/ MPM_2012_14_1_P01.pdf

RAR RUS 11-30 Chhatrapati Shivaji Institute of Technology Chandraker

India

Bhilai Institute of Technology Kumar

India

Chhatrapati Shivaji Institute of Technology Rajesh Kumar

India

Hot Corrosion Behaviour of Nickel Chromium Coating at Different Temperatures (800 °C and 900 °C) on SA213 T91 Boiler Steel Weldments Hot corrosion is a serious problem in power generation equipment, gas turbines for ships aircrafts, energy conversion and chemical process systems. During combustion stage in heat engines, particularly in gas turbines, sodium and sulphur impurities present either in fuel or in combustion air, react to form sodium sulphate (Na2SO4). If the concentration of the sulphate exceeds the saturation vapour pressure at the operating metal temperature for turbine blades and vanes (700 °C-1100 °C), then deposition of the Na2SO4 will occur on the surface of these components. At higher temperatures the deposits of Na2SO4 are molten (melting point =884 °C) and can cause accelerating attack on high alloy or Cr-Mo steels. No alloy is immune to hot corrosion attack indefinitely, although there are some alloy compositions that require a long initiation time at which the hot corrosion process moves from the initiation stage to the propagation stage. Nickel-based coatings have been reported to be widely used as they combine several advantages such as abrasion, erosion and resistance to high-temperature corrosive atmospheres. In this report a comparison on the experimental performance of nickel-based coatings has been made to understand their hot corrosion mechanism. boiler tube steels; GTAW welding; parabolic constant (Kp); Na2SO4- 60%V2O5 salt environment; 80Ni-20Cr coating https://mpm.spbstu.ru/article/2012.22.2/ MPM_2012_14_1_P02.pdf

RAR RUS 31-36 Guru Nanak Dev University Singh

India

Guru Nanak Dev University Kaur

India

Guru Nanak Dev University Kaur

India

Guru Nanak Dev University Arora Deepawali

India

Guru Nanak Dev University Singh

India

Guru Nanak Dev University Singh

India

Density and FTIR Studies of Multiple Transition Metal Doped Borate Glass Glass samples of compositions xCuO-(30-x) ZnO-70B2O3 and xMnO2-(30-x) ZnO- 70B2O3 (where x =5 to 10 mol %) are prepared in the glass forming region. FTIR and density measurements are carried out for these glasses. IR transmission gives valuable information about the nature of bonds present in the glass matrix. It has been observed that, density of MnO2-ZnO-B2O3 glasses has greater value. This is observed that the atomic structure changes more with the incorporation of MnO2. X-ray diffraction; optical properties; FTIR https://mpm.spbstu.ru/article/2012.22.3/ MPM_2012_14_1_P03.pdf

RAR RUS 37-46 Islamic Azad University Bueenzahra Branch Sedighi

Bueenzahra, Iran

Islamic Azad University Bueenzahra Branch Dardashti

Bueenzahra, Iran

A Review of Thermal and Mechanical Analysis in Single and Bi-layer Plate This paper reviews several aspects of thermal and mechanical properties of cookware appliance. Numerical results of temperature distribution (TD), heat retaining, thermal stress and body deformation are summarized. Finite Element Method, ANSYS program, is employed. We described different thermal and mechanical results of Al/Cr-Ni, Al/SSt, Al/Ti, Cu/Cr-Ni, Cu/SSt, Cu/Ti, gray cast iron (GCI), carbon steel (CSt), iron. The laminated plate provides improved thermal and chemical properties in comparison with single layer. From this analysis the result suggests that Cu/SSt bi-metal structure provides the best application as cookware. body deformation; heat retaining; laminated structure; thermal stress; temperature distribution https://mpm.spbstu.ru/article/2012.22.4/ MPM_2012_14_1_P04.pdf

RAR RUS 47-56 Institute of Problems of Mechanical Engineering RAS Bobylev S.V.

St.Petersburg, Russia

Saint Petersburg State University Druzhinin

St.Petersburg, Russia

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

St.Petersburg, Russia

Plastic Deformation in Nanowires via Collective Formation of Nanodisturbances A new physical mechanism of plastic deformation in nanowires is suggested and theoretically described. This mechanism represents collective formation of nanodisturbances - nanoscopic areas of plastic shear with tiny shear vectors - in deformed nanowires. We calculated the energy characteristics for collective nanodisturbance formation and compared them with those for conventional dislocation generation and our earlier model of similar mechanism. It is shown that the deformation mode via collective nanodisturbance nucleation can dominate in Au nanowires deformed at high stresses and zero temperature. nanowires; plastic deformation; dislocations https://mpm.spbstu.ru/article/2012.22.5/ MPM_2012_14_1_P05.pdf

RAR RUS 57-63 Kalasalingam University Arumuga Prabu

Tamilnadu, India

Kalasalingam University Uthayakumar

Tamilnadu, India

Kalasalingam University Manikandan

Tamilnadu, India

Investigation of the Mechanical Properties on Redmud Filled Polyester Banana Composites Using Grey Relational Technique Red mud is an industrial waste generated during the production of alumina by Bayer’s process. General purpose polyester resin is used as a matrix and banana fiber as reinforcement. This paper presents a new approach for the optimization of fabrication parameters on red mud filled banana fiber treated and untreated polyester composite with multiple response based on orthogonal array with grey relational analysis in order to save the initial experimental cost on number of specimen and experimental duration. In this study, fabrication parameters namely red mud percentage, fiber treatment, length of fiber, weight fraction of fiber are optimized with consideration of multi response such as impact strength, flexural strength, and tensile strength. A grey relational grade is obtained from the grey analysis. Based on the grey relational grade, optimum level of parameters has been identified and significant parameters are determined by analysis of variance (ANOVA). Experimental result has shown that the responses in the fabrication process can be improved effectively through the new approach. banana polymer composite; redmud; grey relational analysis; ANOVA https://mpm.spbstu.ru/article/2012.22.6/ MPM_2012_14_1_P06.pdf

RAR RUS 64-73 Karunya University Selvamani

India

Government Arts College (Autonomous) Ponnusamy

India

Damping of Generalized Thermo Elastic Waves in a Homogeneous Isotropic Plate In this paper, the damping of generalized thermo elastic waves in a homogeneous isotropic plate is studied based on generalized two dimensional theory of thermo elasticity. Two displacement potential functions are introduced to uncouple the equations of motion. The frequency equations are obtained by the traction free boundary conditions using the Bessel function solutions. The numerical calculations are carried out for the material Zinc and the computed non-dimensional thermo elastic damping factor is plotted as the dispersion curves for the plate with thermally insulated and isothermal boundaries. damping; vibration of thermal plate; plate immersed in fluid; generalized thermo elastic plate https://mpm.spbstu.ru/article/2012.22.7/ MPM_2012_14_1_P07.pdf

RAR RUS 74-77 Physics Research Centre, Mahatma Gandhi College Betkar

India

Physics Research Centre, Mahatma Gandhi College Bagde

India

Structural and Optical Properties of Spray Deposited CdSe Thin Films CdSe thin films have been deposited on glass substrate in aqueous solution by spray pyrolysis technique at increasing substrate temperatures. The effect of substrate temperature on structural properties has been investigated. The structural, optical and electrical properties of deposited films were studied using, X-ray diffraction (XRD), UV-VIS spectrometry. The XRD diffraction spectra show that the films are of hexagonal in structure. The thickness of film, grain size of constituents and optical properties are also reported. band gap; CdSe; spray pyrolysis; thin films; XR https://mpm.spbstu.ru/article/2012.22.8/ MPM_2012_14_1_P08.pdf

RAR RUS 78-86 Optogan Group Suslov

St.Petersburg, Russia

Ioffe Institute Vinogradova

St.Petersburg, Russia

ITMO University V.E. Bougrov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Odnoblyudov

St.Petersburg, Russia

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

St.Petersburg, Russia

Parametric Modeling of Light Emitting Structures Based on III-Nitrides We consider the task of parametric optimization of the properties for nitride semiconductor light emitting chip. The solution is given in the framework of the selfconsistent electrical/thermal/optical approach. Dependences of radiation power, chip wall plug efficiency (WPE) and current spreading are presented for varying geometry of chip electrodes. The optimization procedure predicts more than 8 % increase in WPE. Original software based on finite volume and ray tracing analysis was used in simulation. LED chip; light output optimization; 3D modeling https://mpm.spbstu.ru/article/2012.22.9/ MPM_2012_14_1_P09.pdf

RAR RUS 78-86 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

Interaction of Intergrain Sliding, Lattice Slip and Grain Boundary Diffusion in Nanocrystalline Ceramics and Metals A model is suggested that describes the interaction of grain boundary (GB) sliding, lattice slip and diffusion as well as the combined effects of these processes on deformation behavior of nanocrystalline ceramics and metals. Within the model, GB sliding accommodated by lattice slip creates special defect configurations - disclination dipoles - near triple junctions of GBs. In the absence of GB diffusion these dipoles hinder considerable GB sliding and result in pronounced strain hardening of nanocrystalline materials. In parallel with these effects, high stresses created by disclination dipoles induce GB diffusion that decreases disclination stresses. Thereby GB diffusion diminishes strain hardening of nanocrystalline solids. The moderate strain hardening, resulting from the interaction of GB sliding and diffusion, suppresses plastic strain instability and, at the same time, does not lead to very high values of the flow stress capable of initiating crack generation and growth processes. nanoceramics; failure; grain boundary sliding; diffusion https://mpm.spbstu.ru/article/2012.22.10/ MPM_2012_14_1_P10.pdf