https://www.elibrary.ru/title_about_new.asp?i 1605-8119 48 1 2022 1-146

RAR RUS 1-8 Universiti Malaysia Sheng C.K.

Terengganu, Malaysia

Universiti Putra Malaysia Yunus W.M.M.

Selangor, Malaysia

National Defence University of Malaysia Yunus W.Md.Z.W.

Kuala Lumpur, Malaysia

Universiti Putra Malaysia Rahman M.Z.Ab.

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 Kalasalingam Academy of Research and Education Ajithram A.

Tamilnadu, India

Cape Institute of Technology Winowlin Jappes J.T.

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 Institute of Macromolecular Compounds of RAS Vaganov G.V.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Vaganov V.V.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kolesnikova A.Yu.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Serikova E.A.

St. Petersburg, Russia

Institute of Macromolecular Compounds RAS Ivan'kova E.M.

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 Northern Border University Amin Magdy M.

Arar, Saudi Arabia

Northern Border University Hendy

Arar, Saudi Arabia

Alexandria University Ezzat

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 ITMO University Nguyen Van T.

St. Petersburg, Russia

N-7717-2016 7005519053 0000-0003-4116-4821 Institute of Problems of Mechanical Engineering RAS Kolesnikova Anna anna.kolesnikova.physics@gmail.com

St. Petersburg, Russia

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

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 Mechanical Engineering Research Institute of RAS Kirikov

Nizhny Novgorod, Russia

0000-0002-0437-8540 Mechanical Engineering Research Institute, Russian Academy of Science Perevezentsev

Nizhni Novgorod, Russia

Mechanical Engineering Research Institute of the Russian Academy of Science – Branch of Federal Research Center «Institute of Applied Physics of the RAS» Pupynin A.S.

Nizhni Novgorod, Russia

Mechanical Engineering Research Institute, Russian Academy of Science Svirina

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 Sam Higginbottom University of Agriculture, Technology And Sciences Pal V.K.

Allahabad, India

Sam Higginbottom University of Agriculture, Technology And Sciences Singh L.P.

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 University of Sidi-BelAbbes Elmeiche A.

Algeria

Mechanics Research Center (CRM) Bouamama M.

Constantine, Algeria

University of Sidi-BelAbbes Elhannani A.

Algeria

Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

Mechanics Research Center (CRM) Hammoudi A.

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 Univ. El-Oued Chedala K.

El Oued, Algeria

Univ. El-Oued Benhaoua A.

El Oued, Algeria

Univ. El-Oued Gheriani R.

El Oued, Algeria

Univ. El-Oued Hima A.

El Oued, Algeria

Univ. El-Oued Ayachi L.

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 Technical and Vocational University (TVU) Heydari A.

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 Belarusian State University of Informatics and Radioelectronics Boiprav Olga V.

Minsk, Belarus

A.V. Luikov Heat and Mass Transfer Institute of NAS of Belarus Grinchik N.N.

Minsk, Belarus

Educational Establishment "Belarusian State University of Informatics and Radioelectronics" Pukhir G.A.

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 Peter the Great St. Petersburg Polytechnic University Kurapova

St.Petersburg, Russia

St.-Petersburg State University Smirnov

St.Petersburg, Russia

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

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Konakov

St.Petersburg, Russia

St. Petersburg State University Lomakina Т.Е.

St. Petersburg, Russia

St. Petersburg State University Glukharev A.G.

St. Petersburg, Russia

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

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