https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
16
2
2013
1-86
RAR
RUS
101-106
Anna University
Suresh
India
Studies on mechanical and electrical properties of NLO active L-glycine single crystal
L-glycine single crystals were grown by slow evaporation technique. The crystals are subjected to microhardness studies and the variation of the microhardness with the applied load is studied. Microhardness studies revealed that the hardness of the grown crystal increases with an increase in load. Meyer’s index number n was calculated and found that the material belongs to soft material category. The dielectric measurements are carried out and the nature of variation of dielectric constant and dielectric loss in the frequency range of 50 Hz to 5 MHz at different temperatures (30 ºC, 60 ºC, 90 ºC, 120 ºC, and 150 ºC) is studied and reported. Further, electronic properties, such as valence electron plasma energy, Penn gap, Fermi energy and electronic polarizability of the grown crystal have been estimated. Photoconductivity measurements carried out on the grown crystal reveal the negative photoconducting nature.
single crystal; growth from solution; microhardness; dielectric and photoconductivity studies
https://mpm.spbstu.ru/article/2013.27.1/
MPM_2012_16_2_P01.pdf
RAR
RUS
107-117
Kalasalingam University
Amuthakkannan
Krishnankoil, India
Kalasalingam University
Manikandan
Tamilnadu, India
Cape Institute of Technology
Winowlin Jappes
J.T.
Levengipuram, India
Kalasalingam University
Uthayakumar
Tamilnadu, India
Effect of fibre length and fibre content on mechanical properties of short basalt fibre reinforced polymer matrix composites
This investigation focuses on the effect of fibre length and fibre content of basalt fibre on mechanical properties of the fabricated composites. Specimen prepared with short basalt fibre as reinforcing materials and polyester resin as a matrix in polymer composite. Based on the availability, different fibre length was taken and fabrication was done with compression moulding machine, keeping the mould closing as constant and increasing the content of fibre in the composites. Specimens were subjected to tensile strength, flexural strength and impact strength test and the failure of the composite was examined with the help of scanning electron microscopy (SEM).
short basalt fibre; fibre length; polymer composites; mechanical properties
https://mpm.spbstu.ru/article/2013.27.2/
MPM_2012_16_2_P02.pdf
RAR
RUS
118-125
Shivaji University
Thombare
India
Radiation & Photochemistry Division, Bhabha Atomic Research Centre
Rath
India
Hanyang University
Han
Seoul, South Korea
Shivaji University
Fulari
India
Synthesis of hydrophilic polypyrrole thin films by SILAR method
Hydrophilic polypyrrole (PPy) thin films were deposited by simple Successive Ionic Layer Adsorption and Reaction (SILAR) method on glass and stainless steel substrate from aqueous solution. The structural and optical properties were studied by means of X-ray diffraction (XRD), Fourier transforms infrared (FTIR) spectroscopy, and Fourier transforms Raman (FT-Raman) Spectroscopy and UVVIS spectrophotometer. The surface wettability properties were studied by means of Contact angle meter. The results showed the SILAR method allows the formation of amorphous and hydrophilic polypyrrole thin films. The polypyrrole thin film showed contact angle of in the range of θc = 30 deg. to θc = 48 deg. The calculated value of surface tension varies between 11.68 mN/m and 19.60 mN/m. Also, the values for work of adhesions were calculated.
polypyrrole; successive ionic layer adsorption and reaction (SILAR) method; surface wettability; contact angle
https://mpm.spbstu.ru/article/2013.27.3/
MPM_2012_16_2_P03.pdf
RAR
RUS
126-134
Riga Technical University
Boiko
Riga, Latvia
Riga Technical University
Avisans
Riga, Latvia
Study of shielding gases for MAG welding
The aim of our research was to find out the influence of the composition of shielding gas on costs of the welding joint. We were looking for different mixtures of shielding gas that is used in MAG welding for non-alloyed steel. For economical estimation of welding joint following researches were executed: amount of spatter on the welded parts after welding, metallographic research of welding joint, chemical composition analysis, penetration, and calculation of the welding joint. Each composition of the shielding gas provided different results for each parameter during the investigation. This brought us to the conclusion which gas mixture provides the best quality of the welding joint. During research we found out that the choice of separate shielding gas influences the speed of welding. This parameter makes the difference in calculation of the welding joint. There is also lay-out of the components that influence the costs of the welding joint in our research work
MAG welding; shielding gas; testing; welding cost
https://mpm.spbstu.ru/article/2013.27.4/
MPM_2012_16_2_P04.pdf
RAR
RUS
135-143
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
Department of Mathematics, N.I.T
Divya
India
Department of Mathematics, N.I.T
Kumar
India
Propagation of wave through cylindrical bore in a swelling porous elastic media
The present paper deals with the axial symmetric cylindrical waves propagating through a cylindrical bore in swelling porous elastic medium. The secular equations, connecting the phase velocity with wave number, radius of bore and other parameters for empty and liquid filled bore are derived. A particular case of interest has also been deduced. Numerical computations have been performed and have also been shown graphically to understand behavior of phase velocity and attenuation coefficient in swelling porous (SP) and elastic medium (EL).
cylindrical bore; phase velocity; attenuation coefficient; secular equation
https://mpm.spbstu.ru/article/2013.27.5/
MPM_2012_16_2_P05.pdf
RAR
RUS
144-158
Kurukshetra University
Sharma
Kurukshetra, India
Ecole polytechnique fédérale de Lausanne (EPFL)
Sharma
Lausanne, Switzerland
IIT Roorkee
Bhargava
India
Effect of viscosity on wave propagation in anisotropic thermoelastic with Green-Naghdi theory type-II and type-III
The aim of the present paper is to study the wave propagation in anisotropic thermoviscoelastic medium in the context Green-Naghdi theories of type-II and type-III. It is found that there exist two quasi-longitudinal waves (qP, qT) and two transverse waves (qS1, qS2). The governing equations for homogeneous transversely isotropic thermoviscoelastic are reduced as a special case from the considered model. Different characteristics of waves like phase velocity, attenuation coefficient are computed from the obtained results. Viscous effect is shown graphically on different resulting quantities for Green-Naghdi theories of type-II and type-III. From the present investigation, some particular cases of interest are also deduced.
wave propagation; viscothermoelastic; Green-Naghdi theory type-II and type-III; phase velocity; attenuation coefficient
https://mpm.spbstu.ru/article/2013.27.6/
MPM_2012_16_2_P06.pdf
RAR
RUS
159-174
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
Kurukshetra University
Chawla
India
Fundamental solution for two-dimensional problem in orthotropic piezothermoelastic diffusion media
The present investigation deals with the study of two-dimensional fundamental solution in orthotropic piezothermoelastic diffusion media. By virtue of the two-dimensional general solution of orthotropic piezothermodiffusion elastic media, the fundamental solution for a point heat source and chemical potential source on the surface of a semi-infinite orthotropic piezothermoelastic diffusion plane is constructed by five newly introduced harmonic functions. The components of displacement, stress, electric displacement, electric potential, temperature change and chemical potential are expressed in terms of elementary functions. The components of displacement, electric potential, temperature change and chemical potential are computed numerically and depicted graphically. From the present investigation, a special case of interest is also deduced to depict the effect of diffusion.
fundamental solution; orthotropic; piezothermoelastic diffusion; operator theory; semi-infinite; electric potential
https://mpm.spbstu.ru/article/2013.27.7/
MPM_2012_16_2_P07.pdf
RAR
RUS
175-186
59122315900
0000-0002-1572-2108
Kurukshetra University
Kumar
Rajneesh
Kurukshetra, India
RTM Nagpur University
Lamba
India
Reliance Industries Limited, Nagpur Manufacturing Division
Varghese
India
Analysis of thermoelastic disc with radiation conditions on the curved surfaces
The principal aim of this paper is to investigate the thermoelastic problems in a nonhomogeneous thick annular disc in which sources are generated according to the linear function of the temperature, with compounded effect due to partial heating and boundary conditions of the radiation type. The solutions are based on theory of integral transformations with boundary conditions of radiation type on the curved surfaces, with independent radiation constants. The results are obtained in series form in terms of Bessel’s functions. Some numerical results for the temperature change, the displacement, and the stress distributions are shown in figures.
annular disc; thermoelasticity; thermal stress; integral transform
https://mpm.spbstu.ru/article/2013.27.8/
MPM_2012_16_2_P08.pdf