Materials physics and mechanics

RAR RUS 1-8 Kalasalingam University Amuthakkannan

Krishnankoil, India

Kalasalingam University Manikandan

Tamilnadu, India

Kalasalingam University Uthayakumar

Tamilnadu, India

Analysis of delamination in drilling of basalt fiber reinforced polymer composites Fiber reinforced polymer composites are used in many engineering applications because of their low strength to weight ratio. Delamination is one of the major problems in manufacturing of the polymer composites. In this work, the delamination of acid treated basalt fiber reinforced composites was studied through drilling operation. Basalt fiber reinforced composites is prepared by using hand layup techniques with unsaturated polyester. Taguchi design of experiment was used to investigate the effects of drilling parameters such as spindle speed [2500, 2750, 3000 rpm], feed rate (0.2, 0.4, 0.6 mm/rev) and point angle (90 °, 118 °, 135 °). A series of experiments based on L9 orthogonal arrays are conducted using CNC machine and resulting delamination factor was determined. It was observed that speed and point angles are highly influencing parameters than feed rate for the delamination of the basalt fiber reinforced polymer composites. basalt fiber; polymer composites; point angle; delamination; Taguchi method https://mpm.spbstu.ru/article/2015.41.1/ MPM124_01_amuthakkannan.pdf

RAR RUS 9-17 59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

H.P. University Vohra

Shimla, HP, India

State space approach to plane deformation in elastic material with double porosity The present paper is to focus on a boundary value problem in a homogeneous, isotropic, elastic body with double porosity. After developing mathematical formulation, a state space approach has been applied to investigate the problem. As an application of the approach, normal force has been taken to illustrate the utility of the approach. The expressions for the components of normal stress and equilibrated stress are obtained in the frequency domain and computed numerically. Numerical simulation is prepared for these quantities and simulated results for these quantities are depicted graphically for a particular model. A particular case of interest is also deduced from the present investigation. double porosity; state space approach; boundary value problem; elasticity https://mpm.spbstu.ru/article/2015.41.2/ MPM124_02_kumar.pdf

RAR RUS 18-23 B.I. Stepanov Institute of Physics Khodasevich

Minsk, Belarus

ITMO University Aseev

St.Petersburg, Russia

B.I. Stepanov Institute of Physics Varaksa

Minsk, Belarus

ITMO University Kolobkova

St.Petersburg, Russia

B.I. Stepanov Institute of Physics Sinitsyn

Minsk, Belarus

Erbium-doped lead fluoride nano-glass-ceramics: application of principal component analysis to upconversion fluorescence spectra for temperature measurement Principal component analysis is applied to violet, green and red bands of upconversion fluorescence spectra of erbium-doped lead fluoride nano-glass-ceramics at temperatures 44-150 °С. Main physical phenomena are revealed that contribute to the three first principal components. Possibility of resolving the Stark structure of long-wavelength green fluorescence band is supposed on the base of the spectra recording at room and higher temperatures. glass-ceramics; upconversion; erbium; principal component analysis https://mpm.spbstu.ru/article/2015.41.3/ MPM124_03_khodasevich.pdf

RAR RUS 24-34 Karunya University Selvamani

India

Free vibration analysis of rotating piezoelectric bar of circular cross section immersed in fluid Free vibration analysis of rotating piezoelectric bar of circular cross-section immersed in fluid is discussed using three-dimensional theory of piezoelectricity. The equations of motion of the bar are formulated using the constitutive equations of a piezoelectric material. The equations of motion of the fluid are formulated using the constitutive equations of an inviscid fluid. Three displacement potential functions are introduced to uncouple the equations of motion, electric conduction. The perfect-slip boundary conditions are applied at the solid-fluid interfaces to obtain the frequency equation of the coupled systems. The frequency equations are obtained for longitudinal and flexural (symmetric and antisymmetric) modes of vibration and are studied numerically for PZT-4 material. The computed wave number and electro mechanical coupling is presented in the form of dispersion curves. The secant method is used to obtain the roots of the frequency equation. piezoelectric cylinder/plates; solid-fluid interaction; thermal cylinders/plates; sensors; stress analysis; gyroscope https://mpm.spbstu.ru/article/2015.41.4/ MPM124_04_selvamani.pdf

RAR RUS 35-40 Institute of Problems of Mechanical Engineering RAS Grashchenko

St.Petersburg, Russia

P-4505-2016 7006034020 0000-0002-2973-8645 Institute of Problems of Mechanical Engineering RAS Kukushkin S.A. sergey,a.kukushkin@gmail.com

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Osipov A.V.

St.Petersburg, Russia

Microhardness study of two-layer nanostructures by a nanoindentation method The paper presents a model describing the Vickers microhardness of a two-layer film on a substrate as a function of a submergence depth of a nanoindenter. On the base of this model, the deformation characteristics of a two-layer silicon carbide nanofilm grown on silicon by an atom substitution method were derived. The Vickers microhardnesses of each layer of the film as well as of a layer of modified silicon, serving as substrate, were obtained. The thickness of each layer of the film was determined, and a good correspondence between the results obtained by an indentation method and data of spectral ellipsometry was exhibited. Vickers microhardness; two-layer film on a substrate; nanoindenter https://mpm.spbstu.ru/article/2015.41.5/ MPM124_05_grashchenko.pdf

RAR RUS 41-49 Kalasalingam University Arumuga Prabu

Tamilnadu, India

Kalasalingam University Manikandan

Tamilnadu, India

Kalasalingam University Venkatesh

Tamilnadu, India

Kalasalingam University Vignesh

Tamilnadu, India

Kalasalingam University Vignesh

Tamilnadu, India

Kalasalingam University Sankar

Tamilnadu, India

Kalasalingam University Sripathy

Tamilnadu, India

Kalasalingam University Subburaj

Tamilnadu, India

Influence of redmud filler on Palmyra fruit and Palmyra fiber waste reinforced polyester composite: hardness, tensile and impact studies The enhancement of composite strength by addition of fillers especially industrial waste attracts more attention. In this article, the effect of redmud (aluminium industry waste) as a secondary reinforcement on Palmyra fruit fiber and Palmyra fiber waste as primary reinforcement along with unsaturated polyester has been analyzed. Hardness, Tensile and Impact property of the Palmyra fibers with and without redmud have been reported. Palmyra fiber (both fruit and waste type) of length 30 mm and weight percentage of 50 % has been taken for this study. Also redmud of different varying weight percentages 10 %, 20 %, 30 %, and 40 % respectively taken to study its effect. It is noted that the Impact strength increases with more and more addition of redmud in both cases of fibers. The Tensile strength increases for 10 %wt addition of redmud in the case of Palmyra fruit fiber and 20 %wt addition of redmud for Palmyra fiber waste. The failure mechanism of the composites has also been discussed by microscopic studies. composite; reinforcement; redmud filler; hardness; tensile; impact https://mpm.spbstu.ru/article/2015.41.6/ MPM124_06_prabu.pdf

RAR RUS 50-60 Institute of Problems of Mechanical Engineering RAS Nazarov

St.Petersburg, Russia

Exfoliation of thin periodic elastic coating due to trapping and propagation of waves An elastic waveguide consists of a straight strip covered with a thin (ℎ ≪ 1) periodic coating at one of strip’s lateral surfaces. The material of the coating is much softer than the one of the massif but their densities are similar. Under a certain relationship between the physical and geometric parameters of the composite waveguide, an asymptotic analysis as ℎ → +0 demonstrates the effect of plurality of spectral gaps, i.e. stopping zones for elastic waves. Moreover, local perturbations of the waveguide profile can bring into the discrete spectrum eigenvalues either below the essential spectrum, or inside discovered gaps. In other words, matching certain parameters in a periodic composite elastic waveguide provides any prescribed number of open gaps in the spectrum as well as any prescribed number of isolated eigenvalues in these gaps and the corresponding trapped modes. Both, travelling and trapped waves at frequencies in the spectral bands, passing zones, and in the discrete spectrum, respectively, provoke localization and concentration of shear stresses at the interface near points where the coating profile function attends its maxima so that the fracture process can be predicted in the vicinity of these points and realizes as fragmentation of the adhesive and a sparsely distributed exfoliation of the thin light periodic coating. thin periodic elastic coating; exfoliation; trapping and propagation of waves https://mpm.spbstu.ru/article/2015.41.7/ MPM124_07_nazarov.pdf

RAR RUS 61-71 Institute Silicate Chemistry of Russian Academy of Science Konakov V.G.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kurapova

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Novik

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Grashchenko

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Osipov A.V.

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Archakov

St.Petersburg, Russia

Approach for electrochemical deposition of copper-graphite films The present paper describes the approaches for electrochemical deposition of copper-graphene coatings. Synthesis of initial reagents and deposition conditions both for constant current and pulse regimes are presented. Mechanical properties of the deposited films were investigated by nanoindentation. It is shown that the deposition approach significantly affects the mechanical properties of the copper-graphene films; the maximal hardness was shown for films deposited in pulse regime. electrochemical deposition; copper-graphite film; mechanical properties https://mpm.spbstu.ru/article/2015.41.8/ MPM124_08_konakov.pdf

RAR RUS 72-85 59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

Himachal Pradesh University Shimla Devi

Shimla, India

Himachal Pradesh University Shimla Sharma

Shimla, India

Plane waves and fundamental solution in a modified couple stress generalized thermoelastic with mass diffusion The present investigation deals with the study of plane waves and fundamental solution in a modified couple stress generalized thermoelastic solid with mass diffusion. It is found that for two-dimensional model, there exists three longitudinal waves namely Longitudinal wave (P-wave), thermal wave (T- wave), mass diffusion wave (MD-wave) and a set of coupled transverse waves (SV1 and SV2 waves). The phase velocity, attenuation coefficient, specific loss and penetration depth are computed numerically and presented graphically. The fundamental solution for the system of differential equations for steady oscillations in terms of elementary functions has been constructed. Some properties of fundamental solution are also established. Various particular cases of interest are also deduced from the present investigations and compared with the known results. modified couple stress; fundamental solution; thermoelastic; steady oscillations; plane waves https://mpm.spbstu.ru/article/2015.41.9/ MPM124_09_kumar.pdf

RAR RUS 86-96 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Orlov

St.Petersburg, Russia

Strength characteristics of copper-graphene nanocomposites This paper presents an overview of research efforts focused on both fabrication and mechanical properties of copper-matrix nanocomposites containing graphene nanoinclusions. A particular attention is devoted to experimental data giving evidence for enhancement of strength, microhardness and Young modulus (due to the effects of graphene nanoinclusions) of such nanocomposites, as compared to unreinforced copper. Key factors are discussed which influence the role of graphene nanosheets and nanoplatelets in remarkable enhancement of the mechanical characteristics of copper-graphene nanocomposites. graphene; strength; hardness; nanocomposites; copper https://mpm.spbstu.ru/article/2015.41.10/ MPM124_10_ovidko.pdf