Materials physics and mechanics

RAR RUS 159-169 Indian Institute of Technology Roorkee Khan

Roorkee, India

Indian Institute of Technology Roorkee Iqbal

Roorkee, India

Institute for Problems of Mechanical Engineering of the RAS Bratov

St.Petersburg, Russia

7005573911 St.Petersburg State University Morozov N.F.

St.Petersburg, Russia

Indian Institute of Technology Delhi Gupta

New Delhi, India

Ballistic resistance of ceramic metallic target for varying layer thicknesses The ballistic behaviour of a bi-layer ceramic-metal target against steel projectile with varying layer thicknesses has been investigated using a three dimensional finite element model. The bi-layer target was made of alumina 99.5 % ceramic front layer and aluminium 2024-T3 metallic back layer with an areal dimension of 100 × 100 mm and the thickness of both layers were varied, with the total thickness of the composite being kept as 10 mm and 20 mm. A steel 4340 cylindrical blunt nosed projectile was used with 30 grams mass and 10.9 mm diameter. The Johnson- Holmquist 2 (JH-2) constitutive model was used for reproducing the high strain behavior of alumina and Johnson-Cook (JC) model was used for aluminium alloy and steel. The impact velocity of the projectile was varied in the range 200-700 m/s for 10 mm total thickness and 500-800 m/s in case of 20 mm total thickness for studying the effects of thickness ratios on ballistic resistance of the bi-layer target. The residual velocities were compared and the ratio of front to back layer providing highest ballistic limit velocity was found for both the cases. 10.18149/MPM.4722021_1 Ballistic resistance Ceramic-metallic target ballistic limit velocity https://mpm.spbstu.ru/article/2021.81.1/ 1-M_K_-Khan%2C-M_A_-Iqbal%2C-V_-Bratov%2C-N_F_-Morozov%2C-N_K_-Gupta.pdf

RAR RUS 170-185 Northern Border University Hendy

Arar, Saudi Arabia

Al Arish University El-Attar

Al Arish, Egypt

Alexandria University Ezzat

Alexandria, Egypt

Thermoelectric viscoelastic spherical cavity with memory-dependent derivative We apply the memory-dependent derivative theory of thermoelasticity to the one-dimensional problem for a viscoelastic spherical cavity subjected to thermal loading. The predictions of the theory are discussed and compared with those for the coupled theory of thermoelasticity. 10.18149/MPM.4722021_2 thermo-viscoelasticity thermoelectric properties memory-dependent derivative spherical cavity Laplace transforms numerical results https://mpm.spbstu.ru/article/2021.81.2/ 2-Mohamed-H_-Hendy%2C-Sayed-I_-El-Attar%2C-Magdy-A_-Ezzat.pdf

RAR RUS 186-195 Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences Kashtanova

St.Petersburg, Russia

Saint-Petersburg State Institute of Technology Rzhonsnitskiy

St.Petersburg, Russia

Saint-Petersburg State Institute of Technology Gruzdkov

St.Petersburg, Russia

On the issue of analytical derivation of stress state in a cylindrical shell with a circular hole under axial tension The stress field in the cylindrical shell with the circular hole is considered. Thoroughly analyzing previous works we concluded that up to the present there are no explicit formulae useful for applications despite numerous works on this subject. Moreover, the classical analytical approach lacks a rigorous mathematical foundation. Its applicability is limited to cases that slightly differ from the plane Kirsch problem. The numerical results of various researches show a significant discrepancy. This paper proposes a new analytical approach based on a different form of representation for the fundamental system of solutions of governing equations. Since, in contrast to previous works, cutting of series is not required the boundary conditions are satisfied with a very high degree of accuracy. Our model works in all ranges that mechanics allows and there are no mathematical restrictions. Some numerical results are presented. 10.18149/MPM.4722021_3 cylindrical shell cutouts stress state circular hole elasticity theory https://mpm.spbstu.ru/article/2021.81.3/ 3-S_V_-Kashtanova%2C-A_V_-Rzhonsnitskiy%2C-A_A_-Gruzdkov.pdf

RAR RUS 196-218 59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

Kurukshetra University Sharma

India

Some theorems and wave propagation in a piezothermoelastic medium with two-temperature and fractional order derivative Wave propagation and some basic theorems like variational principle, uniqueness theorem, and theorem of reciprocity are studied for an anisotropic piezothermoelastic solid with two-temperature and fractional order derivative. The basic governing equations are used to study the interesting problem. Also, we characterize an alternative formulation of the mixed initial boundary value problem. These theorems are also summarised for a special case of orthotropic piezothermoelastic solid with the consideration of two-temperature theory and fractional order derivative. The non-trivial solution of the system is insured by a quartic equation whose roots represent the complex velocities of four attenuating waves in the medium. The different characteristics of the waves like phase velocity and attenuation quality factor are plotted three-dimensionally with the change in direction for two different models. Some special cases are also deduced from the present investigation. 10.18149/MPM.4722021_4 piezothermoelastic orthotropic variational principle uniqueness plane waves phase velocity https://mpm.spbstu.ru/article/2021.81.4/ 4-Rajneesh-Kumar%2C-Poonam-Sharma.pdf

RAR RUS 219-236 Jamia Millia Islamia Akhtar

India

Jamia Millia Islamia Hasan

India

Modified dugdale model for multiple circular arc-cracks with unified plastic zones: a complex variable approach A crack arrest model is presented in this paper for multiple circular arc-cracks with coalesced yield zones. The geometry of cracks discussed in the article assumes as a prelude to the case of two equal circular arc-cracks. Further, the influence of variable stress distribution on the rims of the cracks is studied. Analytical expressions for stress intensity factors and applied load ratios are obtained using the complex variable method. Numerical results are obtained for applied load ratio, yield zone length, and reported graphically. 10.18149/MPM.4722021_5 circular-arc cracks Dugdale strip-yield model yield zone length stress intensity factor https://mpm.spbstu.ru/article/2021.81.5/ 5-Naved-Akhtar%2C-S_-Hasan.pdf

RAR RUS 237-244 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Altai State University Rakitin

Barnaul, Russia

Molecular dynamics study of stress-strain curves for γ-Fe and Hadfield steel ideal crystals at shear along the <111> direction The molecular dynamics method was used to simulate the shear along the direction in Hadfield steel and a pure fcc Fe crystal. The stress-strain curves are obtained depending on the shear rate, the size of the computational cell, and temperature. It is shown that the shear rate in the range of 10–100 m/s has little effect on the theoretical strength at a constant temperature. With increasing temperature, the slope of the stress-strain dependences in the elastic region decreased, which is due to the temperature dependence of the elastic moduli. In addition, the temperature significantly influenced the theoretical strength – with an increase in temperature, plastic deformation began in ideal crystals at lower deformation values. Moreover, this dependence was more pronounced for a pure fcc Fe crystal than for Hadfield steel, which initially had structural imperfections caused by the presence of impurities that facilitate the initiation of plastic shears in a pure crystal. In this regard, at medium and low temperatures, the theoretical strength of pure iron was higher than that of steel. But at high temperatures (above 1200 K), its values for both materials became almost the same. 10.18149/MPM.4722021_6 molecular dynamics theoretical strength stress-strain curve Hadfield steel https://mpm.spbstu.ru/article/2021.81.6/ 6-G_M_-Poletaev%2C-R_Y_-Rakitin.pdf

RAR RUS 245-253 R&D Institute of Science and Technology Rajkumar

India

R&D Institute of Science and Technology Prakash

India

R&D Institute of Science and Technology Salunkhe

India

R&D Institute of Science and Technology Jayavelu

India

Investigation of wear behaviour of duplex stainless steels (DSS) using design of experiments 10.18149/MPM.4722021_7 wear duplex stainless steels design of experiments powder metallurgy https://mpm.spbstu.ru/article/2021.81.7/ 7-C_Rajkumar%2C-J_Udaya-Prakash%2C-Sachin-Salunkhe%2C-S_Jayavelu.pdf

RAR RUS 254-265 Institute of Strength Physics and Materials Science Knyazeva

Tomsk, Russia

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences Kryukova

Tomsk, Russia

The synthesis of composites with reinforcing particles on a thin substrate The article proposes the model for synthesizing a composite coating "intermetallic matrix-reinforcing oxide inclusions" on a substrate under controlled heating by an external moving heat source. The problem is solved in dimensionless variables. The study reveals the main criteria determining the composition of the fabricated composite. It is discovered that, depending on the treatment conditions, the matrix composition may include the main total product or residual unspent reagents and intermediate products, which testifies the nonequilibrium composition of the composite. 10.18149/MPM.4722021_8 electron beam treatment chemical reaction numerical modeling https://mpm.spbstu.ru/article/2021.81.8/ 8-A_G_-Knyazeva%2C-O_N_-Kryukova.pdf

RAR RUS 266-284 Universitas Pendidikan Indonesia Nandiyanto

Bandung, Indonesia

Sampoerna University Triawan

Indonesia

Universitas Pendidikan Indonesia Fiandini

Bandung, Indonesia

Sampoerna University Suryani

Jakarta, Indonesia

Sampoerna University Sunnardianto

Indonesia

Influence of the size of turmeric microparticles reinforcing agent on mechanical and biodegradation properties of cornstarch-based bioplastic material: current studies, experimental results, and proposal material crack phenomena during mechanical t The purpose of this study was to investigate the effect of sizes of turmeric microparticles (as a reinforcing agent) on the mechanical and biodegradation properties of cornstarch-based bioplastic material. The following fabrication procedures were performed: (1) diluting cornstarch in water; (2) making homogeneous mixture of cornstarch, glycerol and acetic acid by heating at less than 100ºC, (3) additional turmeric with a specific size (i.e. 250, 125, 100, 74 μm); (4) molding process; and (5) drying process to obtain solid bioplastic materials. This study shows the importance of reinforcing agent size for improving the mechanical properties of bioplastic materials. The smaller turmeric size brings better mechanical properties than the larger turmeric size that has more void space. To support the analysis, the present study also was completed with a literature review regarding bioplastic production and proposal bioplastics material crack phenomena during mechanical testing. 10.18149/MPM.4722021_9 bioplastics cornstarch particle size mechanical properties turmeric https://mpm.spbstu.ru/article/2021.81.9/ 9-A_B_D_-Nandiyanto%2C-F_-Triawan%2C-M_-Fiandini%2C-I_O_-Suryani%2C-G_-K_-Sunnardianto.pdf

RAR RUS 285-292 National Research University "Moscow Power Engineering Institute" Ryzhenkov

Moscow, Russia

National Research University "Moscow Power Engineering Institute" Volkov

Moscow, Russia

National Research University "Moscow Power Engineering Institute" Mednikov

Moscow, Russia

56449354300 0000-0001-9544-9086 National Research University "Moscow Power Engineering Institute" Tkhabisimov Alexander

Moscow, Russia

National Research University "Moscow Power Engineering Institute" Zilova

Moscow, Russia

National Research University "Moscow Power Engineering Institute" Sidorov

Moscow, Russia

Results of measurements of substrate deformation and determination by bending of internal stresses in Ti-TiC-DLC coating obtained by using HiPIMS technology The paper presents the results of studies of internal stresses in ion-plasma coating Ti-TiC-DLC. A method based on measuring the deformation of the substrate was used to carry out this research. Plates of 08kp steel were used as a substrate, the geometry of which was chosen based on their further application for droplet erosion testing and determination of stresses arising in the coating under high-speed drop impact. A technique is presented for conducting research on substrates with a geometry that is changed in comparison with the classical configuration used to determine the internal stresses in the coating by the bending method. Bending values were obtained from the surface profiles obtained before and after coating, which were used to calculate stresses by using the Stoney formula. Application of the selected coating leads to the appearance of compressive stresses ranging from 3 to 9 GPa. 10.18149/MPM.4722021_10 stress measurement diamond-like carbon coatings high power impulse magnetron sputtering droplet erosion https://mpm.spbstu.ru/article/2021.81.10/ 10-Tkhabisimov-et-al.pdf

RAR RUS 293-305 Federal Scientific Research Centre "Crystallography and Photonics" of the Russian Academy of Sciences Vnuk