Materials physics and mechanics

RAR RUS 399-407 Peter the Great St. Petersburg Polytechnic University Vasilyev

St.Petersburg, Russia

0000-0002-0185-5452 Peter the Great St. Petersburg Polytechnic University Zolotorevsky

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Sokolov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Philippov

St.Petersburg, Russia

Crystallographic texture of industrial automotive steels and effect of tertiary cementite dissolution on its development X-ray investigation of crystallographic texture and its correlation with rm value (Lankford coefficient) was performed on a representative set of industrial automotive steels of different grades. Though the majority of steels had the structure of polygonal ferrite with small fractions of pearlite in the hot rolled condition, steels with a more complex structure were also included in the study. For this set of steels, a linear dependency has been shown to hold between rm value and the logarithm of the ratio of volumes having orientations of {111} and {100} planes parallel to the sheet plane. It is proposed that the observed reduction of rm value with increasing carbon content in steel is caused by the dissolution of tertiary cementite during recrystallization annealing 10.18149/MPM.4732021_1 automotive steels annealing recrystallization texture tertiary cementite https://mpm.spbstu.ru/article/2021.82.1/ 1-A_A_-Vasilyev%2C-N_Y_-Zolotorevsky%2C-D_F_-Sokolov%2C-S_A_-Philippov.pdf

RAR RUS 408-415 St. Petersburg State University Selyutina

St.Petersburg, Russia

Influence of Mg and Cu on the dynamic yield stress of aluminium alloys Based on the temperature relaxation model of plasticity, the effects of the irreversible deformation of metals that appear under conditions of various temperature and strain rate regimes are studied. The appearance of the yield drop on the dynamic deformation dependence for 2519А aluminium alloys at a temperature of -45°C in the range of strain rates 1000–4000 s–1 is predicted. Dynamic dependencies for Al-13Mg aluminium alloys at temperatures 325°C and 425°C are constructed. The temperature relaxation model of plasticity applied is able to predict various types of deformation curves for on one material in a wide range of strain rates and temperatures. DOI: 10.18149/MPM.4732021_2 relaxation model of plasticity aluminium alloys yield drop https://mpm.spbstu.ru/article/2021.82.2/ 2-N_S_-Selyutina.pdf

RAR RUS 416-422 Motilal Nehru National Institute of Technology Allahabad Singh

India

Institute of Engineering & Technology Lucknow Singh

India

Institute of Engineering & Technology Lucknow Singh

India

Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Nigam

India

Effect of Ni on the dielectric behavior and microwave absorption performance of ZnO composites. In the present study, ZnO/Ni composites have been studied for its dielectric and microwave absorption behavior as a function of x (Ni/Zn-acetate ratio) viz. x=0.08, 0.12, and 0.16 in the frequency range of 2-18 GHz. The hydrothermal method was successfully employed for the synthesis of single-phase Ni and ZnO particles. The phase confirmation was done using the X-ray diffraction technique and Maud refinement was successfully carried out using Maud software for the determination of crystallite size and the lattice parameters of pure Ni, pure ZnO, and x=0.16 sample. The inclusion of Ni in ZnO results in the improvement of complex permittivity values as compared to pure ZnO. However, there is not much significant enhancement in the complex permeability values. The microwave absorption characteristics are completely dependent on the dielectric properties of the composite materials. Ni incorporated ZnO composites show improvement in the microwave absorption characteristic as compared to pure ZnO. The improvement in microwave absorption behavior of the ZnO/Ni composite system may be ascribed to various mechanisms viz. dipole polarization, interfacial polarization, conduction loss, and impedance matching which synergistically acts to enhance the microwave absorption. A minimum reflection loss of -12.86 dB corresponding to > 90% absorption of incident microwave energy was observed for x=0.16 sample at a frequency of 17.47 GHz corresponding to 3 mm absorber thickness as compared to pure ZnO having a minimum reflection loss of -1.5 dB at the same absorber thickness. 10.18149/MPM.4732021_3 microwave absorption Ni ZnO reflection loss dipole polarization interfacial polarization https://mpm.spbstu.ru/article/2021.82.3/ 3-Singh-Samarjit.pdf

RAR RUS 423-430 St. Petersburg State University Vakaeva

St.Petersburg, Russia

St. Petersburg State University Shuvalov

St.Petersburg, Russia

St. Petersburg State University Kostyrko

St.Petersburg, Russia

Evolution of the cylindrical nanopore morphology under diffusion processes In the present paper, we provide a theoretical approach to the analysis of nanopore morphological stability under diffusion taking into account surface elasticity. It is assumed that the pore shape may change during stress relaxation. The surface atomic flux is caused by the nonuniform distribution of chemical potential, which depends on bulk and surface stresses as well as pore surface curvature. The change in surface relief is described by the linearized evolution equation, which is derived taking into account the solution of the boundary value problem of plane elasticity for determining the elastic and surface energy. For this purpose, we use a first-order approximation of the boundary perturbation method. The solution of the linearized evolution equation allows us to analyze the influence of physical and geometrical parameters of the problem on pore surface morphological stability. 10.18149/MPM.4732021_4 2D problem nanopore morphological instability surface diffusion boundary perturbation method nanomaterials. https://mpm.spbstu.ru/article/2021.82.4/ 4-A_B_-Vakaeva%2C-G_M_-Shuvalov%2C-S_A_-Kostyrko.pdf

RAR RUS 431-437 Mechanical Engineering Research Institute, Russian Academy of Science Sarafanov

Nizhni Novgorod, Russia

Kozma Minin Nizhny Novgorod State Pedagogical University Shondin

Nizhny Novgorod, Russia

Deformation instability in crystalline alloys: Luders bands A mechanism of localization of plastic deformation at high temperatures is investigated in the framework of the autowave model. A model of the formation and propagation of Luders bands is proposed. It is established that a Luders band is a wavefront of the plastic deformation rate. From this article's point of view, the conditions for the formation of a Luders band are decisive for the interpretation of the fluidity serration. The critical value of the deforming stress is determined, at which the homogeneous deformation becomes unstable with respect to the localized flow in the form of Luders bands. In the present consideration, we interpret the Luders band as a wave of switching of the plastic deformation rate. At low stresses, dislocations surrounded by clouds of impurity atoms move slowly and cannot provide a deformation comparable to that, which is produced by a testing machine. As the stress increases, the generation of "fast" dislocations begins, which are formed either due to the detachment of dislocations from the clouds of impurity atoms. As a result, this state, having arisen, propogates as a running front forming a shear band of "fast" dislocations. 10.18149/MPM.4732021_5 localization of deformation plastic deformation high temperatures autowaves Luders bands https://mpm.spbstu.ru/article/2021.82.5/ 5-G_F_-Sarafanov%2C-Yu_G_-Shondin.pdf

RAR RUS 438-454 Engineering Faculty ADU Dural Ebru

Aydın, Turkey

Effect of temperature on Charpy impact response of laminated glass structures For the structural purpose, the usage of laminated glass units in the modern construction industry is becoming widespread. Laminated glass units are manufactured using glass layers bonded together with interlayer materials. When the laminated unit is shattered, the interlayer prevents large and sharp pieces. This property makes laminated glass a safety glass, which prevents injury and even death of people. The current study is about the effect of temperature on the impact behavior of laminated glass, which has different interlayer materials and interlayer thickness. Experiments are conducted for the analysis of the impact behavior of the laminated glass units. Also, a finite element model is developed using a commercial package program ABAQUS. Comparison of impact response of laminated glass units for different interlayer thicknesses, different temperature values, and for different interlayer materials, PVB and EVA, are given as a result of the study. 10.18149/MPM.4732021_6 laminated glass impact PVB temperature EVA Charpy impact test https://mpm.spbstu.ru/article/2021.82.6/ 6-Dural-Ebru.pdf

RAR RUS 455-474 Institute for Problems of Mechanical Engineering of the RAS Bratov

St.Petersburg, Russia

Numerical simulations of dynamic fracture. Crack propagation and fracture of initially intact media The paper briefly reviews progress in numerical simulations of dynamic crack propagation and fracture of initially intact media and presents examples of simulations utilizing finite element method with embedded dynamic fracture criterion based on the concept of incubation time of brittle fracture introduced by Petrov and Morozov. The examples include dynamic fracture initiation, propagation arrest, and evolution of fracture zones in initially intact media. It is demonstrated that this approach is capable to give an accurate description of all the variety of phenomena associated with dynamic fracture. An important feature of the approach, distinguishing it from the majority of other dynamic fracture criteria is the necessity to introduce but one additional material parameter, easily evaluated experimentally, in order to predict dynamic fracture. 10.18149/MPM.4732021_7 FEM dynamics fracture incubation time crack velocity crack arrest quasibrittle fracture erosion https://mpm.spbstu.ru/article/2021.82.7/ 7-V_-Bratov.pdf

RAR RUS 475-482 M.S. Ramaiah University of Applied Sciences Anil Kumar

Bengaluru, India

M.S. Ramaiah University of Applied Sciences Mahendra Babu

Bengaluru, India

An investigation on the growth of fatigue crack between sequentially cold expanded adjacent circular holes in Al 7075 - T651 alloy Critical structural holes located in close proximities are sequentially cold expanded one after the other in series to enhance their fatigue strengths by inducing beneficial residual stresses around hole regions. In some instances, where, several holes are closely located, the cold expansion–induced beneficial residual stress fields in the regions between the holes are considerably different in comparison to the case of cold expansion of a single hole that is free from a proximity hole. Therefore, an attempt is made in the present work to investigate the crack growth behavior in the residual stress field induced by the sequential cold expansion of closely spaced adjacent holes in typical aircraft-grade Al 7075-T651 alloy. In the present work, initially, Finite Element (FE) simulation on the sequential cold expansion of two adjacent holes in thin Al 7075-T651plate is carried out for 4% expansion level and resulting compressive residual stress fields around hole regions are predicted. Further, an experimental investigation on sequential cold expansion process is carried out using indigenously developed tooling set-up and Fatigue Crack Growth (FCG) behavior between cold expanded holes is measured through testing. The FCG measurement results indicate that crack propagation rate is higher between the cold expanded holes in comparison to the case of noncold expanded holes. 10.18149/MPM.4732021_8 adjacent circular holes aluminium alloy sequential cold expansion beneficial residual stresses fatigue crack growth https://mpm.spbstu.ru/article/2021.82.8/ 8-S_-Anil-Kumar%2C-N_C_-Mahendra-Babu.pdf

RAR RUS 483-492 Peter the Great St. Peresburg Polytechnic University Kharkov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Alkhimenko

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Shaposhnikov

St.Petersburg, Russia

Peter the Great St. Peresburg Polytechnic University Alekseeva

St.Petersburg, Russia

SSRT method: application to studying the mechanism of stress corrosion cracking in steels and alloys (overview) The paper briefly describes the slow strain rate testing (SSRT) method used for steels and alloys, considering the stress and strain criteria for assessing the sensitivity of materials to stress corrosion cracking (SCC). We pointed out the clear benefits of the SSRT method over static SCC testing. We reviewed the modern theories of the main possible mechanisms of SCC, typically including alternating stages of anodic dissolution and hydrogen embrittlement during the initiation and propagation of cracks. The given examples indicate that electrochemical studies are necessary to understand the conditions when SCC might develop following one of two mechanisms. Furthermore, we substantiated metallographic analysis and investigations on the fracture surface of the samples to establish the cracking trajectories and the failure behavior. The brief overview presents examples of applying the SSRT method to testing low-alloy, stainless steels, aluminum, and nickel alloys in various corrosive environments. 10.18149/MPM.4732021_9 steels stress corrosion cracking SSRT method metallography fracture structure https://mpm.spbstu.ru/article/2021.82.9/ 9-A_A_-Kharkov%2C-A_-A_-Alkhimenko%2C-N_O_-Shaposhnikov%2C-E_L_-Alekseeva.pdf

RAR RUS 493-500 Motilal Nehru National Institute of Technology Allahabad Nigam

India

Motilal Nehru National Institute of Technology Allahabad Singh

India

Motilal Nehru National Institute of Technology Allahabad Sinha

India

Motilal Nehru National Institute of Technology Allahabad Sachan

India

Motilal Nehru National Institute of Technology Allahabad Anisha

India

Motilal Nehru National Institute of Technology Allahabad Vishal

India

Kumar Motilal Nehru National Institute of Technology Allahabad Kumar

India

Structural and magnetic properties of zinc doped nickel ferrite Ni(1−X)ZnXFe2O4 synthesized using sol-gel auto-combustion and hydrothermal methods Zinc doped Nickel ferrites with chemical formula Ni(1−x)ZnxFe2O4 (x = 0.2, 0.4, 0.6, and 0.8) were synthesized using both Sol-gel auto-combustion and Hydrothermal methods. The synthesized powders were characterized for their physical and magnetic properties. The crystal structure and lattice parameter of these compounds were investigated by X-ray diffraction (XRD) and morphology has been confirmed by Scanning Electron Microscopy (SEM). The magnetic properties of after-calcined nanoparticles were measured at room temperature using a vibrating sample magnetometer (VSM). X-ray diffraction of these samples shows the presence of a single-phase cubic spinel ferrite structure. The VSM analysis indicates that the Zn content has a significant influence on the magnetic properties such as Saturation Magnetization (Ms), Coercivity (Hc), and Remanence (Mr). The doping concentration of Zn increase with an increase of x which causes a significant increase in the Ms from x=0.2 to 0.4 then decrease from x=0.6 to 0.8. A critical Rietveld analysis of XRD reveals the presence of a very small amount of NiO phase along with the ferrite phase. The Rietveld analysis also confirms the crystallite size and lattice parameter. 10.18149/MPM.4732021_10 nickel zinc spinel ferrite hydro-thermal sol-gel https://mpm.spbstu.ru/article/2021.82.10/ Abhishek-et-al-.pdf

RAR RUS 501-513 Hanoi National University of Education Hoc

Hanoi, Vietnam

Hanoi National University of Education Tinh

Hanoi, Vietnam

Mac Dinh Chi High School Hien

Chu Pah, Gia Lai, Vietnam

"Dunarea de Jos" University of Galati Coman

Romania

Nonlinear deformation of BCC metal Fe and BCC Interstitial alloy FeSi: dependence on temperature, pressure and silicon concentration Based on our model and theory of nonlinear deformation for BCC binary interstitial alloy built by the statistical moment method, we perform numerical calculations for characteristic quantities of nonlinear deformation such as the density of deformation energy, the maximum real stress, the limit of elastic deformation together with the stress-strain curve for metal Fe and alloy FeSi with the BCC structure at temperature up to 1100K, pressures up to 10 GPa, and silicon concentrations up to 4%. The calculated results of Fe are compared with experiments and the calculated results of FeSi are our new predictions. 10.18149/MPM.4732021_11 nonlinear deformation interstitial alloy the density of deformation energy maximum real stress limit of elastic deformation stress-strain curve statistical moment method https://mpm.spbstu.ru/article/2021.82.11/ 11-N_-Q_-Hoc%2C-B_-D_-Tinh%2C-N_-D_-Hien-and-G_-Coman.pdf

RAR RUS 514-526 1 Federal state unitary enterprise «All-Russian scientific research institute of aviation materials» State research center of the Russian Federation – VIAM Shershak

Moscow, Russia

Emanuel Institute of Biochemical Physics of Russian Academy of Sciences – IBCP RAS Levin

Moscow, Russia

Joint stock company «National institute of aviation technologies» - JSC NIAT Kosarev

Moscow, Russia

Emanuel Institute of Biochemical Physics of Russian Academy of Sciences – IBCP RAS Morokov

Moscow, Russia

Emanuel Institute of Biochemical Physics of Russian Academy of Sciences – IBCP RAS Petronyuk

Moscow, Russia

Research of failure process of carbon fiber reinforcement plastic specimens with diagnosing of microstructural destruction by means of acoustic microscopy . The analysis of failure process of carbon fiber reinforcement plastic (CFRP) samples under tension load is given. For a visual representation of the results of preliminary calculations, samples' failure set with different layers loads and different reinforcement lay-up is given. CFRP samples were loaded gradually up to the loads at which the failure process begins and develops. In order to visualize the volume microstructure of the samples the acoustic microscopy data which was carried out after each stage of sample loading is given. The research of the dynamic structure failure process in samples shows that the calculation method was used is correct and that the diagnosing of the failure process in carbon fiber samples at different stages by using methods of acoustic microscopy is possible. 10.18149/MPM.4732021_12 polymer composite material carbon fiber reinforced plastic failure process microstructure calculation procedure diagnostic defects non-destructive test acoustic microscopy https://mpm.spbstu.ru/article/2021.82.12/ 12-P_V_-Shershak-et-al.pdf

RAR RUS 527-541 Institute of Continuous Media Mechanics UB RAS Morozov

Perm, Russia

Institute of Electrophysics UB RAS Kamenetskikh

Ekaterinburg, Russia

Institute of Continuous Media Mechanics UB RAS Beliaev

Perm, Russia

Perm State University Scherban

Perm, Russia

Institute of Technical Chemistry UB RAS Kiselkov

Perm, Russia

Institute of Ecology and Genetics of Microorganisms UB RAS Lemkina

Perm, Russia

Physical-mechanical and structural properties of phase-separated polyurethane surface treated in argon plasma. Plasma treatment is a promising way of surface modification. In the case of heterogeneous materials, the study of the local properties of surfaces at the structural level is of interest. The changes of the surface of polyurethane (two-phase polymer, elastic modulus 25 MPa) under the action of argon plasma were studied by atomic force microscopy and finite-element modeling. The initial structure of polymer (stiff fibrils non-uniformly distributed in a softer matrix) is gradually destroyed during the treatment. The soft phase is etched and the roughness increases, especially in the areas of high concentration of the hard phase. A heterogeneous stiff carbon-containing nanolayer is formed on the surface; its thickness, elastic modulus, and adhesion depend on the local properties of the polymer and the duration of treatment. The materials have increased wettability and free surface energy, which made a positive effect on protein sorption 10.18149/MPM.4732021_13 plasma treatment polyurethane atomic force microscopy surface nanoindentation https://mpm.spbstu.ru/article/2021.82.13/ 13-Morozov-et-al.pdf