https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
48
1
2022
1-146
RAR
RUS
1-8
Sheng
C.K.
Universiti Malaysia
Terengganu, Malaysia
Yunus
W.M.M.
Universiti Putra Malaysia
Selangor, Malaysia
Yunus
W.Md.Z.W.
National Defence University of Malaysia
Kuala Lumpur, Malaysia
Rahman
M.Z.Ab.
Universiti Putra Malaysia
Selangor, Malaysia
Laser-induced photoacoustic characterization on thermal diffusivity of chitosan and sago starch biocomposite blend film
The photoacoustic(PA) technique has been testified to be versatile and also reliable for measuring the thermal properties of most materials. For example, it has been utilized to verify the thermal diffusivity of semiconductors, polymers, superconductors, metal, and glass. In this study, the thermal diffusivity of the sago starch and chitosan polymer blend films was characterized using the laser-induced photoacoustic technique. It is based upon the theoretical analysis of the measured photoacoustic signal as a function of light modulation frequency. The value of thermal diffusivity is found to be dependent on the blend composition and further validation was performed through FTIR analysis. The optical transmission spectra show that the blend films process good optical transparency and improved surface quality when compared to the pure sago starch film.
10.18149/MPM.4812022_1
chitosan; sago starch; photoacoustic; thermal diffusivity; optical properties
https://mpm.spbstu.ru/article/2022.86.1/
1-Chan-Kok-Sheng-et-al.pdf
RAR
RUS
9-19
Ajithram
A.
Kalasalingam Academy of Research and Education
Tamilnadu, India
Winowlin Jappes
J.T.
Cape Institute of Technology
Levengipuram, India
Siva
I.
Influence of fiber length, weight percentage on water hyacinth polymer composite material properties – aquatic waste into commercial applications
The major factors that affect the properties of fiber-reinforced composites are the length and weight percentage of the fibers. In this work, hyacinth fiber is extracted from the parent plant to the novel way of the mechanical-based extraction process. Mechanical experiments like tensile, flexural, impact strength and modulus are processed as per ASTM standards. The 2mm length of hyacinth fiber composite attained 38.456 MPa tensile strength, and the flexural strength is attained at 54.76 MPa. Then, the fractured surface of the hyacinth composite sample is carried to the scanning electron microscope. This works covers the hyacinth plants into hyacinth fiber reinforced polymer composites especially for commercial applications like particleboard, packaging boards, and it is adopted to convert the environmental threat of aquatic waste into a successful commercial product approach.
10.18149/MPM.4812022_2
polymer composite
water hyacinth fiber
mechanical properties
scanning electron microscope
absorption behavior
water hyacinth natural fiber composite
https://mpm.spbstu.ru/article/2022.86.2/
2-A_-Ajithram%2C-J_-T_-Winowlin-Jappes%2C-I_-Siva.pdf
RAR
RUS
20-29
Vaganov
G.V.
Institute of Macromolecular Compounds of RAS
St.Petersburg, Russia
Vaganov
V.V.
Peter the Great St. Petersburg Polytechnic University
St. Petersburg, Russia
Kolesnikova
A.Yu.
Peter the Great St. Petersburg Polytechnic University
St. Petersburg, Russia
Serikova
E.A.
Peter the Great St. Petersburg Polytechnic University
St. Petersburg, Russia
Ivan'kova
E.M.
Institute of Macromolecular Compounds RAS
St. Petersburg, Russia
Epoxy-polyester coatings with additives of PTFE particles and nanoparticles of SiO2
Hydrophobic and super-hydrophobic coatings based on epoxy-polyester powder compositions modified with polytetrafluoroethylene (PTFE) particles and nanoparticles silicon dioxide were obtained. The degree of hydrophobicity of the coatings depended on the concentration of PTFE particles. Coatings containing optimal amounts of PTFE exhibited superhydrophobic properties with a high contact angle of wetting with water up to 161° and a low roll angle
10.18149/MPM.4812022_3
powder polymer compositions
fluoroplastic additives
contact angle
surface energy
roughness
hydrophobicity
mechanical properties
https://mpm.spbstu.ru/article/2022.86.3/
3-G_V_-Vaganov%2C-V_V_-Vaganov%2C-A_Yu_-Kolesnikova%2C-E_A.pdf
RAR
RUS
30-43
Amin
Magdy M.
Northern Border University
Arar, Saudi Arabia
Hendy
Northern Border University
Arar, Saudi Arabia
Ezzat
Alexandria University
Alexandria, Egypt
Wave propagation due to laser irradiation in viscoelastic thin metal film with fractional relaxation operator
In the present paper, the model of generalized thermo-viscoelastic theory with fractional relaxation operators is used to capture the microscale responses of viscoelastic metal film irradiated uniformly by a laser pulse heat flux with non-Gaussian form. Employing Laplace transform as a tool, the problem has been solved analytically in the transformed domain. The inverse transforms are obtained by using a numerical method based on Fourier expansion techniques. The effects of fractional relaxation operators and viscoelastic property on the responses of the metal film are discussed and illustrated graphically.
10.18149/MPM.4812022_4
thermo-viscoelastic material
fractional relaxation operators
thin metal film
Laplace transforms
numerical results
https://mpm.spbstu.ru/article/2022.86.4/
4-Magdy-M_-Amin%2C-Mohamed-H_-Hendy%2C-Magdy-A_-Ezzat.pdf
RAR
RUS
44-60
Nguyen Van
T.
ITMO University
St. Petersburg, Russia
Kolesnikova
Anna
Institute of Problems of Mechanical Engineering RAS
St.Petersburg, Russia
Romanov
A.E.
ITMO University
St.Petersburg, Russia
Elasticity of thin dilatational disk in an isotropic half-space
In this article, the solution to the elasticity boundary-value problem for an infinitesimally thin dilatational disk (ITDD) embedded in an elastically isotropic half-space is presented. The plane of the disk is parallel to the free surface. To solve the boundary value problem, the method of virtual defects is used. The image (mirror) ITDD and radial Somigliana dislocation loops (RSDLs), distributed continuously over the free surface coaxially with the ITDD, are chosen as virtual defects. The ITDD displacements, strains, and stresses are represented in the form of the sums of the Lipschitz-Hankel integrals. It is shown that the elastic field of the ITDD disk is distorted near the free surface and possesses nonzero dilatation and hydrostatic stress. Numerical estimates of dilatation are given and its influence on some characteristics of semiconductors is briefly discussed.
10.18149/MPM.4812022_5
dilatational disk
isotropic elasticity
half-space
elastic fields
https://mpm.spbstu.ru/article/2022.86.5/
5-T_-Nguyen-Van%2C-A_L_-Kolesnikova%2C-A_E_-Romanov.pdf
RAR
RUS
61-68
Kirikov
Mechanical Engineering Research Institute of RAS
Nizhny Novgorod, Russia
0000-0002-0437-8540
Perevezentsev
Mechanical Engineering Research Institute, Russian Academy of Science
Nizhni Novgorod, Russia
Pupynin
A.S.
Mechanical Engineering Research Institute of the Russian Academy of Science – Branch of Federal Research Center «Institute of Applied Physics of the RAS»
Nizhni Novgorod, Russia
Svirina
Mechanical Engineering Research Institute, Russian Academy of Science
Nizhni Novgorod, Russia
Crack arrest by the elastic field of wedge disclination and planar shear mesodefect
The arrest conditions due to the action of the elastic fields of a dipole of wedge disclinations and a planar shear mesodefect are considered for dislocation cracks propagating under external loading. The regions of stable cracks existence are determined using the method of configurational force in the configuration space of the system parameters (the mesodefect strength vs the Burgers vector of the crack) and the maps of the cracks lengths distribution were plotted at various values of the external stress. The length of the cracks turns out to be comparable with the mean size of fragments and lies in the range of 0.1-0.3 μm at the parameters of the fragmented structure and values of the external stress typical for the stage of material pre-fracture. It is shown, that both in the case of the disclination dipole and in the case of the planar shear mesodefect the regions of instability of cracks shift towards lower dislocation charge of the crack and higher values of the mesodefects strength with an increase in the external stress. It is concluded, that the considered mesodefects can effectively arrest the propagation of cracks in the fragmented structure, thereby providing their accumulation in certain areas of the material and creating the "fracture nuclei"
10.18149/MPM.4812022_6
dislocation crack
disclination dipole
shear mesodefect
crack arrest
configuration force method
https://mpm.spbstu.ru/article/2022.86.6/
6-S_V_-Kirikov%2C-V_N_-Perevezentsev%2C-A_S_-Pupynin%2C-J_V_-Svirina.pdf
RAR
RUS
69-90
Pal
V.K.
Sam Higginbottom University of Agriculture, Technology And Sciences
Allahabad, India
Singh
L.P.
Sam Higginbottom University of Agriculture, Technology And Sciences
Allahabad, India
Microstructure characterization of weld consumable condition on residual stress, flexural strength, and room temperature tensile tests of P92 steel
10.18149/MPM.4812022_7
P92 steel
microstructure
mechanical properties
tensile properties
PWHT
https://mpm.spbstu.ru/article/2022.86.7/
7-Vinay-Kumar-Pal%2C-L_P_-Singh.pdf
RAR
RUS
91-105
Elmeiche
A.
University of Sidi-BelAbbes
Algeria
Bouamama
M.
Mechanics Research Center (CRM)
Constantine, Algeria
Elhannani
A.
University of Sidi-BelAbbes
Algeria
Belaziz
Mechanical Research Center Constantine, University campus of châaberssas
Constantine, Algeria
Hammoudi
A.
Mechanics Research Center (CRM)
Constantine, Algeria
Dynamic modeling of functionally graded beams undergoing mobile mass
In this paper, the dynamic modeling of functionally graded beams subjected to a mobile mass is studied using modal analyzes. The material properties are assumed to vary continuously in the transverse direction according to an exponential law. A new simple shear deformation beam theory (SFPSDBT) has been formulated and employed in the study, taking into account the effect of the material inhomogeneity and as well the inertia of moving mass. The governing equations are derived using Hamilton's principle combined with a Galerkin weighted residual approach. The forced dynamics are solved by using the implicit Newmark method via the MATLAB program. Detailed analysis is performed to determine the impact of; material properties distribution, charging speed, the inertia of traveling mass, slenderness ratio, and mass weight on the dynamic responses. We can state that the above-mentioned effects should be considered in mathematical modeling, as they play a very important role in the forced vibration of functionally graded beams undergoing mobile mass.
10.18149/MPM.4812022_8
dynamic modeling
FG beams
mobile mass
SFPSDBT
Galerkin approach
charging speed
modal responses.
https://mpm.spbstu.ru/article/2022.86.8/
8-Abbes-Elmeiche%2C-Mohammed-Bouamama%2C-Abdelhak-Elhannani%2C-Azzeddine-Belaziz%2C-Abderazek-Hammoudi.pdf
RAR
RUS
106-113
Chedala
K.
Univ. El-Oued
El Oued, Algeria
Benhaoua
A.
Univ. El-Oued
El Oued, Algeria
Gheriani
R.
Univ. El-Oued
El Oued, Algeria
Hima
A.
Univ. El-Oued
El Oued, Algeria
Ayachi
L.
Univ. El-Oued
El Oued, Algeria
Study of structural and optical properties of iron, cobalt doped and iron-cobalt co-doped tin dioxide SnO2
This paper studied undoped tin dioxide (SnO2), iron doped tin dioxide (FeTO), cobalt doped tin dioxide (CTO), and iron-cobalt co-doped tin dioxide (FeCTO) thin films using spray pyrolysis technique at a temperature of 480°C heated glass. The dopant concentration value was 12wt %. Whilst, the structural and optical characteristics of fabricated thin films were studied. XRD analyses avowed the formation of rutile thin films structure along (211) and (110) as preferred orientations. The obtained crystallite size varies from 31.96 nm to 46.48 nm. SEM analysis of the surface morphology shows that the whole substrates are well covered by SnO2 uniform material with variant shape upon post doping. UV-visible investigation of optical transmittance spectra showed that the films have transparency ranging in 85-98%, with a direct bandgap in the range 3.65-3.85eV. Found results show that Fe/Co co-doped SnO2 presents improvement in properties compared to other single dopants.
10.18149/MPM.4812022_9
Fe-Co co-doped SnO2 thin films
spray pyrolysis method
X-ray diffraction
SEM
UV-Vis Spectroscopy
https://mpm.spbstu.ru/article/2022.86.9/
9-K_-Chedala%2C-A_-Benhaoua%2C-R_-Gheriani%2C-A_-Hima%2C-L_-Ayachi.pdf
RAR
RUS
114-123
Heydari
A.
Technical and Vocational University (TVU)
Tehran, Iran
Damped vibration analysis of lumped mass on bidirectionally graded beam rested on torsion spring hinges
This article is concerned with the vibration control of a bidirectionally graded beam supported on torsion spring hinges using a lumped mass damper. The conventional mixing rule is used to model the material gradation in the thickness direction. The material gradation in the axial direction is modeled by an exponential function. The spectral Ritz method is employed to minimize the total potential energy and calculate the fundamental angular frequency of free vibration and the corresponding mode shape. The characteristic vibration equation of the system is obtained by calculating the determinant of the Hessian of the total potential energy. For the first time, the modified Taylor basis is introduced, which eliminates the drawbacks and the necessity of using auxiliary functions in the spectral Ritz method. For this purpose, the modified Taylor basis is calculated by satisfying the boundary conditions and the natural conditions at the ends of the beam. The effects of the dimensionless rotational stiffness at the ends of the beam, the material gradations in the axial and transverse directions, the amount and position of the lumped mass on the fundamental angular frequency of the free vibration are investigated.
10.18149/MPM.4812022_10
damped vibration
mass damper
bidirectional gradation
semi-rigid support
spectral Ritz method
modified Taylor basis
https://mpm.spbstu.ru/article/2022.86.10/
10-A_-Heydari.pdf
RAR
RUS
124-135
Boiprav
Belarusian State University of Informatics and Radioelectronics
Minsk, Belarus
Grinchik
N.N.
A.V. Luikov Heat and Mass Transfer Institute of NAS of Belarus
Minsk, Belarus
Pukhir
G.A.
Educational Establishment "Belarusian State University of Informatics and Radioelectronics"
Minsk, Belarus
Experimental Substantiation of The Possibility of Hydrolytic Lignin Using in the Architectural Electromagnetic Shielding Systems
The article presents the research results of electromagnetic radiation reflection and transmission characteristics in the frequency range 0.7–17.0 GHz of the hydrolytic lignin, impregnated to saturation with the electrolyte water solution, at different temperatures of this material. The research is aimed at simultaneously solving of two problems: 1) search for new inexpensive materials for electromagnetic shielding; 2) experimental substantiation of a new promising method of hydrolysis lignin utilization. Based on the research results, it is possible to conclude the hydrolytic lignin is prospective for use for the manufacture of moisture-containing materials that attenuate electromagnetic radiation energy. Such materials could be used in the architectural electromagnetic shielding systems (including in the systems operating under conditions other than standard) in the form of filler for air gaps of walls and floors or filler for the building mixtures. In practice, such systems are used for protection radioelectronic equipment or people, located inside of the buildings, from the impact of external electromagnetic radiation.
10.18149/MPM.4812022_11
hydrolytic lignin
architectural electromagnetic shielding
electromagnetic radiation reflection and transmission coefficients
calcium chloride
https://mpm.spbstu.ru/article/2022.86.11/
11-O_V_-Boiprav%2C-N_N_-Grinchik%2C-G_A_-Pukhir.pdf
RAR
RUS
136-146
Kurapova
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Smirnov
St.-Petersburg State University
St.Petersburg, Russia
Solovyeva
E.N.
Institute Silicate Chemistry of Russian Academy of Science
St.Petersburg, Russia
Konakov
Peter the Great St. Petersburg Polytechnic University
St.Petersburg, Russia
Lomakina
Т.Е.
St. Petersburg State University
St. Petersburg, Russia
Glukharev
A.G.
St. Petersburg State University
St. Petersburg, Russia
Konakov
V.G.
Institute Silicate Chemistry of Russian Academy of Science
St.Petersburg, Russia
The intermetallic compounds formation and mechanical properties of composites in the Ni-Al system
Aluminum-nickel (Al-Ni) based intermetallic compounds are regarded as the promising materials for the high-temperature engineering applications, including harsh environments. So far, a satisfactory modeling has been done to analyze the structural properties, heats of formation, elastic properties and electronic energy band structures of Al-Ni intermetallic compounds. However, the experimental studies on Al-Ni intermetallic compounds formation and the data on the structure and mechanical properties are fragmentary in the literature. In the present work, the intermetallic compounds in Al-Ni system were obtained from nanonickel powder and micron-sized aluminum powders for the first time using modified powder metallurgy technique. Phase formation and structures of powders and consolidated materials were investigated via XRD, SEM, EDX and hydrostatic weighting. Via XRD it was shown, that despite the strong interactions between Ni and Al the formation of intermetallic compounds in the system is hindered. The density of consolidated specimens increases with nickel content increase. The sample 10nNi with the highest content of Al3Ni showed the best mechanical properties among the other specimens: Due to the reinforcement effect of the intermetallic compound, the sample with the highest content of Al3Ni showed the microhardness of 161±39 HV.
10.18149/MPM.4812022_12
intermetallic compound
nickel aluminide
phase formation
tensile strength
hardness
powder metallurgy technique
https://mpm.spbstu.ru/article/2022.86.12/
12-O_K_-Kurapova-et-al.pdf