Materials physics and mechanics

RAR RUS 665-675 36954400700 0000-0002-2680-4256 Institute for Metals Superplasticity Problems of RAS Ganeev

Ufa, Russia

57214663886 0000-0002-2418-8218 Institute for Metals Superplasticity Problems of RAS Zainullin

Ufa, Russia

Institute for Metals Superplasticity Problems of RAS Shakhov

Ufa, Russia

Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Mukhtarov

Ufa, Russia

Institute for Metals Superplasticity Problems of the Russian Academy of Sciences Imayev

Ufa, Russia

Post-dynamic recrystallization in a heavily alloyed Ni-based superalloy The work is devoted to a study of post-dynamic recrystallization in a recently developed nickel-based superalloy SDZhS-15 manufactured by ingot metallurgy and intended for disc applications. The as-cast superalloy was subjected to long-term homogenization annealing and canned forging at subsolvus temperatures (T=Ts-(40-70), where Ts is the γ′ solvus temperature) under quasi-isothermal conditions. This led to the formation of a refined recrystallized fine-grained structure with individual non-recrystallized γ grains in the central part of the forged workpiece. However, in the near-surface layers of the forged workpiece, the volume fraction of non-recrystallized grains was appreciably higher. To further recrystallize the as-forged microstructure the recrystallization annealing was performed at a temperature (T=Ts-70) for different times to obtain a homogeneous recrystallized and fine-grained structure (dγ 10.18149/MPM.4752021_1 nickel-based superalloy microstructure recrystallization annealing solid solution treatment grain/interphase boundaries https://mpm.spbstu.ru/article/2021.84.1/ 47(2021)1-Artem-Ganeev-et-al.pdf

RAR RUS 676-680 7003559440 0000-0003-2192-0386 Institute for Problems of Mechanical Engineering RAS Skiba Nikolai nikolay.skiba@gmail.com

St. Petersburg, Russia

Deformation mechanism of bimodal metal-graphene composites with nanotwinned structure The theoretical model is suggested which describes micromechanisms of plastic deformation in bimodal metal-graphene composite consisting of large grains embedded into nanocrystalline/ultrafine-grained metal-matrix reinforced by graphene inclusions. In the framework of the model, lattice dislocation slip and grain boundary sliding has occurred in nanocrystalline/ultrafine-grained matrix, and lattice dislocation slip and migration of twin boundaries are realized in large grains with a nanotwinned structure providing the plastic deformation of bimodal metal-graphene composite. With this assumption, the yield stress of nanotwinned bimodal metal-graphene composite was calculated. 10.18149/MPM.4752021_2 metal-graphene composite bimodal structure nanotwins twin boundaries yield stress https://mpm.spbstu.ru/article/2021.84.2/ 47(2021)2-Skiba.pdf

RAR RUS 681-694 Indian Institute of Technology Roorkee Tak

Roorkee, India

Indian Institute of Technology Roorkee Iqbal

Roorkee, India

Axial compression behavior of thin-walled mild steel tubes subjected to axial impact The finite element computations were performed on ABAQUS/Explicit solver to study the effect of wall thickness on axial crushing and energy absorption of the mild steel tubes under axial impact. Circular tube (60 mm diameter) and square tube (47.34 mm size) with varying wall thicknesses (1.1, 1.5, 2, 2.5, and 3 mm) were impacted axially by 5 kg projectile. A comparative study has also been carried out on axial compression behavior of tubes with circular and square tubes with equivalent section areas. The constitutive and damage behavior of the mild steel was modelled using the Johnson-Cook material model. The validation of the computational model was carried out by performing the experiments on 60 mm diameter circular tube under the axial impact of 5 kg projectile. The maximum axial compression of the circular and square tubes has been found to be decreased with an increase in the wall thickness of the tubes, however, the absorbed energy does not show any significant influence with the change in the wall thickness of the tubes. The maximum axial compression of the square tubes was found to be higher than the circular tubes for thicknesses 1.1 and 1.5 mm. On the other hand, the axial compression of the circular tubes was found higher at higher thicknesses beyond 1.5 mm. 10.18149/MPM.4752021_3 axial deformation energy absorber crashworthiness thin-walled tubes https://mpm.spbstu.ru/article/2021.84.3/ 47(2021)3-S_K_Tak%2C-M_A_-Iqbal.pdf

RAR RUS 697-705 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

0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

ITMO University V.E. Bougrov

St.Petersburg, Russia

Multi-step dilatational inclusion in an elastically isotropic cylinder We consider an elastic inclusion in a cylinder with isotropic materials properties. The inclusion possesses a multi-step dependence of the dilatational eigenstrain along the cylinder axis. Basing on the solution for the trace of the stress tensor of the dilatational inclusion with sharp boundaries (single-step inclusion) the stored elastic energy of the multi-step inclusion is determined and analyzed. Then, the found analytical solution for the inclusion energy is used to investigate the energy properties of the transition region between the cylinder domains with a constant level of dilatational eigenstrain. The application of the obtained results to the relevant physical problems of mechanical behavior of hybrid nanodisk/nanowire (ND/NW) semiconductor heterostructures is discussed. 10.18149/MPM.4752021_4 dilatational inclusion (DI) eigenstrain elastic cylinder elastic strain energy nanodisk/nanowire hybrid structure https://mpm.spbstu.ru/article/2021.84.4/ 47(2021)4-A_L_-Kolesnikova-et-al.pdf

RAR RUS 706-719 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Ahmedov

Tashkent, Uzbekistan

Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Mirsaidov

Tashkent, Uzbekistan

Finite element of rotating wheelset and its natural frequencies determination This article is devoted to solving urgent problems related to the development of a mathematical model and methods for assessing the dynamic characteristics of railway wheelsets. In the simulation, railroad wheelsets are considered as a one-dimensional deformable body based on the Bernoulli-Euler theory with two rigid disks. The cross-section of the shaft is assumed flat and perpendicular to the centerline during vibration. Disks are modeled as a rigid body characterized by mass and moment of inertia. The centrifugal and gyroscopic effects and the damping properties of the material are taken into account. With these factors, the problem under consideration is reduced to a higher order of a homogeneous system of differential equations, which is then solved using the Altair Hyperworks and Matlab software. The dynamic characteristics of railway wheelsets are investigated depending on the angular speed of the wheel (without taking into account the contact between the wheelset and the rail), with and without damping. At that, a number of new mechanical effects were established. 10.18149/MPM.4752021_5 railway wheelsets dynamic characteristics eigenfrequencies and modes damping centrifugal and gyroscopic effects https://mpm.spbstu.ru/article/2021.84.5/ 47(2021)5-Ahmedov-et-al.pdf

RAR RUS 720-726 Perm National Research Polytechnic University Guzev

Perm, Russia

Perm National Research Polytechnic University Riabokon

Perm, Russia

Perm National Research Polytechnic University Turbakov

Perm, Russia

Perm National Research Polytechnic University Poplygin

Perm, Russia

Non-classical model for description of the dynamic elasticity modulus of the materials A nonclassical gradient model of a continuous medium is proposed to describe the dispersion of Young's modulus of a rock sample observed under dynamic loading of the sample. The phenomenological parameters of the model are determined on the basis of an analysis of the results of experimental studies of the behavior of Young's modulus depending on the frequency and amplitude of the external loading. 10.18149/MPM.4752021_6 gradient model dynamic modulus of elasticity non-stationary load material heterogeneity https://mpm.spbstu.ru/article/2021.84.6/ 47(2021)6--Guzev-et-al.pdf

RAR RUS 727-738 Peter the Great St. Petersburg Polytechnic University Vasilyev

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Sokolov

St.Petersburg, Russia

Experimental study and modeling of changing mechanical properties in tempering of bainitic-martensitic steels Dependences of mechanical properties (yield stress, tensile stress, relative elongation) and impact toughness on the tempering time at various temperatures have been investigated for 10 industrial bainitic-martensitic steels with a wide range of chemical compositions (C(0.04-0.27), Mn(0.33-1.57), Si(0.22-1.09), Cr(0.02-1.14), Ni(0.01-3.74), Cu(0.02-1.03), Mo(0.01-0.43), Nb(0.002-0.044), V(0.003-0.200), Ti(0.001-0.045), B(≤0.003) (mass.%)). Based on the obtained experimental results, a quantitative model is developed to predict the mechanical properties of the considered steels after tempering. The modeling results comply well with experiments. The average relative errors in predicting the yield and tensile stresses are, respectively, 5.9 and 5.3%, and the average absolute error in predicting the relative elongation is 2.5%. 10.18149/MPM.4752021_7 steels tempering microstructure mechanical properties modeling https://mpm.spbstu.ru/article/2021.84.7/ 47(2021)7-Vasilyev-et-al.pdf

RAR RUS 739-746 Vels Institute of Science, Technology and Advanced Studies Gundugandla Kishore

Chennai, India

Vels Institute of Science, Technology and Advanced Studies A. Parthiban

Chennai, India

Mechanical Engineering, K.Ramakrishnan College of Engineering A. Mohana Krishnan

Trichy, India

Mechanical Engineering, Nadar Saraswathi College of Engineering and Technology B. Radha Krishnan

Theni, India

Investigation of the surface roughness of aluminium composite in the drilling process This paper investigates the Surface roughness in the various Aluminium composite. The drilling experiment is performed on specimens Al7075 + 3% Al2O3, Al7075 + 3% Al2O3 + 1% Mica, Al7075 + 3% Al2O3 + 2% Mica, Al7075 + 3% Al2O3 + 3% Mica with high-speed steel twist drills of 5 mm diameter grade M2. ISO 234:1980 is the specification of the drills used in the current work. The drilling experiment takes place with a feed speed of 0.5 mm/rev. For the aluminum composite samples with coolant, the cutting speed is at different speeds of 10, 20, and 30 mm/min. The Surface Measuring Unit of the Stylus type is used to locate the Surface Roughness Ra of the drilled hole surface. The number of iterations completed is five times for the repeatability of effects with the same drilling parameters. The surface roughness had increased with the addition of reinforcement. The 2% mica addition showed a better surface finish than the 3% addition. Scanning Electron Microscopy investigated the Surface Morphological characteristics. 10.18149/MPM.4752021_8 drilling process surface roughness composite measurement aluminium https://mpm.spbstu.ru/article/2021.84.8/ 47(2021)8-Gundugandla-Kishore-et-al.pdf

RAR RUS 747-766 0000-0003-1806-0274 Computing Center of the Far Eastern Branch of the Russian Academy of Sciences Tkachenko

Khabarovsk, Russia

Computing Center of the Far Eastern Branch of the Russian Academy of Sciences Ryabokon

Khabarovsk, Russia

Asymptotic analysis of the equations of hydroelastic oscillations in thin-walled elastic pipeline A mathematical model of the dynamics of a curved pipeline as a membrane shell filled with an ideal compressible fluid is constructed. A form of an approximate solution of the model equations is found in which the dimension of the problem reduces by one. An asymptotic analysis of the obtained differential equations is performed for various small parameters. Two systems of model equations with different characteristics are obtained. These systems are transformed into systems of first-order equations in canonical form with explicitly defined Riemann invariants. The characteristics of the obtained systems of equations are found and the main types of waves propagating in a curved pipe are identified. Numerical experiments have been performed. The results obtained correspond to the results from the literature sources. 10.18149/MPM.4752021_9 curved pipeline shell hydroelastic vibrations asymptotic series dimension reduction characteristics method https://mpm.spbstu.ru/article/2021.84.9/ 47(2021)9-Tkachenko-et-al.pdf

RAR RUS 767-779 Peter the Great St. Petersburg Polytechnic University Kondrateva

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Babyuk

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Strekalovskaya

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Filatov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Gabdullin

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kvashenkina

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Prokopenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Gruzdev

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Petruhno

St. Petersburg, Russia

Alferov St. Petersburg National Research Academic University Kuznetsov

St. Petersburg, Russia

Laser-driven metal alteration for glucose detection sensor In this work, an experimental comparison of the laser-driven alteration of nickel, copper, and steel surface efficiency was carried out. The selection of the material most suitable for non-enzymatic measurement of the glucose amount in the medium was carried with respect to surface modification efficiency. The electrooxidative activity of the fabricated structures with a modified surface was investigated with respect to the glucose addition to a 0.1 M solution NaOH by potentiostatic method. The modified active NiO layer allows us the amperometric determination of glucose in the concentration range from 10 µM to 1.5 mM with sensitivity is higher than 10 µA/(mM·cm2) and the detection limit is not less than 5 µM. The proposed technology allows the manufacture of electrodes for non-enzymatic determination of glucose in alkaline solutions. 10.18149/MPM.4752021_10 laser alteration surface modification glucose oxidation sensor https://mpm.spbstu.ru/article/2021.84.10/ 47(2021)10-Gabdullin-et-al.pdf

RAR RUS 780-786 IPME RAS Atroshenko

St.Petersburg, Russia

Petersburg State Transport University Maier

St. Petersburg, Russia

Petersburg State Transport University Smirnov

St.Petersburg, Russia

Failure analysis in lifetime estimation of rails An attempt is made to find the relationship between the mechanical properties of the material in microvolumes and the properties of the material under load. A fractographic analysis of the surface of a fatigue fracture of a railway rail with an internal transverse crack is presented. The relationship of fractographic features with the structure of the material is discussed. 10.18149/MPM.4752021_11 rail steel fracture surface recrystallization https://mpm.spbstu.ru/article/2021.84.11/ 47(2021)11-Atroshenko-et-al.pdf

RAR RUS 787-795 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Shikalov

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Filippov

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Vidyuk

Novosibirsk, Russia

Cold spray deposition of composite copper-tungsten coatings The work is devoted to the experimental study of the mechanical properties of cold sprayed composite copper-tungsten coatings. Using the instrumental indentation technique, mechanical tests of coatings containing tungsten microinclusions in the content range 0-32 wt.% were carried out. It was shown that an increase in the content of tungsten in the copper matrix of the coating promotes an increase in the microhardness and elastic modulus of the coating. Adhesion strength tests of coatings were carried out, which showed that an increase in the content of tungsten in the feedstock mixture leads to a significant increase in the value of the adhesion-cohesion strength of the coating. 10.18149/MPM.4752021_12 cold spray coating composite copper-tungsten microhardness elastic modulus adhesion strength https://mpm.spbstu.ru/article/2021.84.12/ 47(2021)12--Shikalov-et-al.pdf

RAR RUS 796-815 Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Bharti

India

Motilal Nehru National Institute of Technology Allahabad Goyal

Prayagraj, India

Motilal Nehru National Institute of Technology Allahabad Patel

Prayagraj, India

The evolution of brake friction materials: a review Today, in the fast-moving world, the focus of all automobile companies is to increase the speed of vehicles to reduce travel time. With an increase in the speed of vehicles, there is an urgent need for the development of friction materials suitable for high-speed braking applications. A historical review of various materials used to date for making brake pads and brake drum/disc is done in the present work. Asbestos was the most suitable and widely used brake lining material, but its carcinogenic nature has forced the health and environment agencies to ban it. Ban on the use of asbestos has forced researchers to develop asbestos-free brake friction materials. Today, the non-asbestos organic type of brake pads is most widely used. But, non-asbestos organic type brake pads wear out rapidly and generate lots of wear debris. Wear debris generated from braking materials is a cause of concern to the health and environmental agencies. So, researchers are working on developing environment-friendly brake friction materials for all-weather high-speed braking applications. Natural fibre or agricultural waste-based brake pads are considered as the future material for brake pads. At the same time, cast iron was the most commonly used material for brake discs or drums. Today, various materials such as aluminium matrix composites, carbon-carbon composites, and ceramic-based materials are used to make brake discs or drums. However, the use of cast iron is still preferred. Aluminium matrix composite is considered the future material for brake discs or brake drums because of its low density and improved braking stability. 10.18149/MPM.4752021_13 aluminium matrix composite brake disc brake drum brake pad non-asbestos organic https://mpm.spbstu.ru/article/2021.84.13/ 47(2021)13-Kumar-et-al.pdf