Materials physics and mechanics

RAR RUS 147-160 Henan Polytechnic University Chen

Henan, China

Effects of different factors on the heat conduction properties of carbon nanotubes The effects of structure, purity, and alignment on the thermal conductivity of carbon nanotube-based films and fibers were studied experimentally to understand the heat transport phenomena occurring in the nanostructured materials. The thermal conductivity of the macroscopic films and fibers was determined by employing the parallel thermal conductance technique. The effects of different factors on the heat conduction properties were investigated to evaluate the roles of bulk density and cross-sectional area in the thermal conductivity of the nanostructured materials. The results indicated that macroscopic films and fibers produced from carbon nanotubes can conduct heat very efficiently, depending on a variety of factors. The structure, purity, and alignment play fundamentally important roles in determining the heat conduction properties of carbon nanotube-based films and fibers. Macroscopic films and fibers produced from single-walled carbon nanotubes typically possess high heat conduction properties. The non-carbonaceous impurities negatively affect the heat conduction properties because of the low degree of bundle contact. Carbon nanotube-based films and fibers give rise to a power-law dependence of thermal conductivity with respect to temperature. The specific thermal conductivity decreases with increasing bulk density. Low bulk density can compensate for the adverse effect of poor alignment on specific thermal conductivity. A maximum specific thermal conductivity is achieved at room temperature, but Umklapp scattering occurs. The specific thermal conductivity of carbon nanotube-based fibers is significantly higher than that of carbon nanotube-based films because of the increased degree of bundle alignment. 10.18149/MPM.4822022_1 Carbon nanotubes; Material properties; Thermal conductivity; Thermal physics; Thermal properties; Phonon scattering https://mpm.spbstu.ru/article/2022.87.1/ 1-Junjie-Chen.pdf

RAR RUS 161-174 Joint stock company "Research, Design and Technological Institute of Oil Refining and Petrochemical Equipment" Tupitsin

Volgograd, Russia

Joint stock company "Research, Design and Technological Institute of Oil Refining and Petrochemical Equipment" Trishkina

Volgograd, Russia

Joint stock company "Research, Design and Technological Institute of Oil Refining and Petrochemical Equipment" Sycheva

Volgograd, Russia

Joint stock company "Research, Design and Technological Institute of Oil Refining and Petrochemical Equipment" Storozheva

Volgograd, Russia

Joint stock company "Research, Design and Technological Institute of Oil Refining and Petrochemical Equipment" Novikov

Volgograd, Russia

Study of the influence of structural heritage and operating conditions on the durability of safety valve springs from steel 50KHFA The reasons for the premature failure of a spring made of steel 50KhFA, which operated in the safety valve of the column's head part of the flare facility, were investigated using analytical chemistry, energy dispersive analysis, macro- and microstructural analysis, electron microscopy, macro- and electron fractography, phase chemical and X-ray structural analysis, hardness and microhardness tests and reductive heat treatment according to the regime recommended for safety valve springs in the standard process documentation and reference literature. The influence of non-metallic inclusions, such as carbides, their chemical composition, shape, and distribution on the operational properties of springs from steel 50KhFA has been investigated. Information on the characteristic external signs, typical micro damages, and the mechanism of destruction during low-temperature hydrogen sulfide corrosion of steel 50KhFA with the most dangerous accompanying process – hydrogenation was obtained. The analysis of the research results showed that the premature failure of the spring is due to both technological heredity and contact with the working environment not envisaged by the project. 10.18149/MPM.4822022_2 steel 50KhFA spring safety valve failure fracture low-temperature hydrogen sulfide corrosion cracking failure mechanism https://mpm.spbstu.ru/article/2022.87.2/ 2-M_-Tupitsin-et-al.pdf

RAR RUS 175-183 Perm National Research Polytechnic University Poplygin

Perm, Russia

Perm National Research Polytechnic University Riabokon

Perm, Russia

Perm National Research Polytechnic University Turbakov

Perm, Russia

Perm National Research Polytechnic University Kozhevnikov

Perm, Russia

Perm National Research Polytechnic University Guzev

Perm, Russia

China University of Mining and Technology Jing

Jiangsu, China

Changes in rock permeability near-wellbore due to operational loads The paper presents the results of studies of changes in the permeability of rocks in the bottom hole zone of wells in the process of oil production. Using the exponential equation for predicting the permeability of the rock with a change in reservoir pressure based on the data of well test data, an improved model is proposed. The developed model takes into account operational conditions that lead to a change in the structure of the rock matrix and oil degassing as a result of a reservoir pressure decrease. The proposed model includes empirical parameters. The model describes the hysteresis of the rock permeability for oil during the subsequent decrease and increase in reservoir pressure. For the model under consideration, the average change (decrease) in the permeability at the wellbore with an increase and subsequent decrease in the load is 30% of the initial value. Using the proposed model, numerical hydrodynamic calculations of the change in the time of oil production with a change in pressure were carried out. The lower the reservoir pressure, the longer the period of oil production. A significant decrease in reservoir pressure at the initial stages of oil production and its subsequent production leads to an increase in the terms of the development of recoverable oil reserves. 10.18149/MPM.4822022_3 stress-sensitive reservoir rock matrix permeability oil production https://mpm.spbstu.ru/article/2022.87.3/ 3-V_V_-Poplygin%2C-E_P_-Riabokon-et-al.pdf

RAR RUS 184-198 JSC "NIIEFA Piskarev

St. Petersburg, Russia

JSC "NIIEFA" Gervash

St. Petersburg, Russia

JSC "NIIEFA" Bobrov

St. Petersburg, Russia

JSC "NIIEFA" Ruzanov

St. Petersburg, Russia

JSC "NIIEFA" Ogurski

St. Petersburg, Russia

JSC "NIIEFA" Mazul

St. Petersburg, Russia

JSC "NIIEFA" Giniyatulin

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Ermakov

St. Petersburg, Russia

National Research Nuclear University MEPHI Sevryukov

Moscow, Russia

Analysis of CuCrZr/316L(N) bimetallic joint with and without nickel interlayer for plasma-facing components The work considers the CuCrZr/316L(N) bimetallic joint, which is obtained by diffusion bonding using hot isostatic pressing (HIP) and is a design element of the plasma-facing components (PFC) of a thermonuclear reactor. A comparative analysis of the specified bimetallic joint with a nickel interlayer obtained by different methods and without it has been carried out. A study of the structure and elemental composition of the bimetallic joint was made, where the brittle zirconium phases were identified in the interface zone for all the considered variants. The results of microhardness testing are obtained, demonstrating the presence of a sharp transition of hardness values by more than two times at the interface of two metals. A series of rupture tests of the bimetallic samples was carried out and almost identical values of the rupture stress were obtained for all the considered bimetallic joint variants. The fracture of the samples during the testing at temperatures up to 150°C occurred on the base metal and at higher temperatures – on the bimetallic joint. 10.18149/MPM.4822022_4 Bimetallic joint CuCrZr/316L(N) diffusion bonding Nickel interlayer brittle layer plasma-facing components microhardness rupture test embrittlement https://mpm.spbstu.ru/article/2022.87.4/ 4-Piskarev-et-al.pdf

RAR RUS 199-207 Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

University of Sidi Bel Abbes Mazari

Sidi Bel Abbes, Algeria

Mechanics Research Center (CRM) Bouamama M.

Constantine, Algeria

University of Djilali Bounaama-Khamis Meliana Zahaf

Théniet El had, Algeria

University of Sciences and Technology of Oran Mouloud

Oran, Algeria

Experimental study of ductile and fragile pipe cracked in High-Density Polyethylene (HDPE) In this paper the experimental study of the fragility, ductility fracture and the mechanical behavior of high-density polyethylene pipe cracked is subject with know the damage law taken account of the deformation velocity which related to the cracking speed. The ductile fracture of HDPE pipes is characterized by a short crack that propagates rapidly perpendicular to the direction of stretching. The tests were carried out on different specimens cracked and uncracked taken from high density polyethylene (HDPE). The main aim of this study is studied the damage and material HDPE with two cases cracked and uncracked specimens of HDPE and knowing the physical quantities and the understanding of the effect of the deformation velocity on the mechanical behavior. 10.18149/MPM.4822022_5 density polyethylene (HDPE) pipes ductile fracture characteristics damage fragility tensile test crack propagation https://mpm.spbstu.ru/article/2022.87.5/ 5-Azzeddine-Belaziz-et-al.pdf

RAR RUS 208-216 ITMO University Kazankov

St. Petersburg, Russia

MIREA – Russian Technological University Shmeleva

Moscow, Russia

ITMO University Zaitseva

St. Petersburg, Russia

Unstable plastic flow in structural materials: time series for analysis of experimental data The present study provides the mathematical description of changing metals characteristics during exploitation, as well as identifies behaviors and features during plastic deformation. Modern experimental facilities allow conducting a full-scale experiment, recording the effects observed, determining the patterns of materials behavior of and their alloys to predict the occurrence of unstable plastic flow. The arrays of experimental data obtained in the format of discrete values were processed with the wave-record method for the data interpolation and normalization. The results' comparison enabled to determine the class of materials with similar patterns of deformational plastic behavior. That allowed us to describe the patterns of irreversible deformations and their nature to formulate the postulates for the theory of plasticity, materials science, and prediction of complex systems' behavior. The paper presents the results of experimental studies of plastic deformation of aluminum alloy samples to determine the characteristics of unstable plastic flow in the material. The analysis of the obtained data for the samples confirmed the presence of the Portevin-Le Chatelier effect. Based on the experimental results, deformation diagrams and time series were developed, and the data correlation for the samples was also confirmed. The wave process that occurs in the material during stretching correlates hydrodynamic with the occurrence of rogue waves. It is important to note that when analyzing the time series of experimental data for aluminum alloys, a pattern of correspondence with time series in the analysis of rogue waves was noted. 10.18149/MPM.4822022_6 Portevin-Le Chatelier effect aluminum alloys deformation diagrams plasticity time series rogue waves https://mpm.spbstu.ru/article/2022.87.6/ 6-Vladislav-K_-Kazankov%2C-Anna-G_-Shmeleva%2C-Ekaterina-V_-Zaitseva.pdf

RAR RUS 217-231 Badji Mokhtar University of Annaba Mzad

Annaba, Algeria

Experimental investigation of the mechanical behavior of honeycomb sandwich composite under three-point bending fatigue The present experimental work deals with the mechanical fatigue behavior under 3-point bending stress of composite aluminum panels with an aramid honeycomb core. The testing conditions (applied load and frequency), under cyclic loading, the analysis of rigidity loss, and the damage modes are the tools for this experimental investigation. The specimens consist of aluminum sheets, one millimeter thick each for the skins, and a honeycomb aramid structure, eight millimeters high for the core. As a first approach, the static 3-point bending tests made it possible to determine the deflection variation as a function of the force applied, which will be exploited to carry out fatigue tests on an EPSIFLEX machine type. They are made for three loading levels of imposed deformation with a load ratio of 0.2 and a frequency of 5 Hz. The results obtained allowed the determination of the stiffness loss curves and the Wöhler curves in order to optimize the loading conditions and the service life of the sandwich composite material. The tests were carried out for 3 cyclic loading; they show that the optimal load ensuring better service resistance of the experimented sandwich panels is 0.7 of the material elastic limit (720 N). Static and cyclic flexion fractography showed the different modes of skin damage (indentation) and honeycomb core (delaminating and shearing) leading to the specimens' ruin. 10.18149/MPM.4822022_7 3-point bending composite material stress amplitude fatigue threshold damage https://mpm.spbstu.ru/article/2022.87.7/ 7-Hocine-Mzad.pdf

RAR RUS 232-241 St. Petersburg State University Shuvalov

St.Petersburg, Russia

St. Petersburg State University Kostyrko

St.Petersburg, Russia

Stability analysis of nanoscale surface patterns in ultrathin film coating This paper presents a theoretical approach to the analysis of ultrathin film morphological stability under surface diffusion. Based on the simplified Gurtin–Murdoch model the surface elasticity has been taken into account. Due to the lattices mismatch, the film structure is subjected to misfit stress. It is assumed that the free surface can change its shape via mass transfer in order to minimize the total energy. Surface diffusion is considered the main mechanism leading to the morphological instability of the film surface. It is supposed that the atomic flow along the surface is proportional to the gradient of the chemical potential. The change in surface profile amplitude is described by the linearized evolution equation, which is derived by taking into account the solution of the corresponding plane elasticity problem. Based on the proposed approach, the effect of the physical and geometric parameters on the morphological stability of the ultrathin film surface has been analyzed. 10.18149/MPM.4822022_8 ultrathin film coating surface elasticity morphological instability surface diffusion https://mpm.spbstu.ru/article/2022.87.8/ 8-G_M_-Shuvalov%2C-S_A_-Kostyrko.pdf

RAR RUS 242-271 University of Djilali Bounaama-Khamis Meliana Zahaf

Théniet El had, Algeria

University of Sciences and Technology of Oran Dahmane

Oran, Algeria

Mechanical Research Center Constantine, University campus of châaberssas Belaziz

Constantine, Algeria

Mostaganem University-Abdelhamid Ibn Badis Bouri

Mostaganem, Algeria

National Polytechnic School of Oran - MA Afane

Oran, Algeria

Failure analysis of semi-ellıptical crack behavior in the cement mantle of a total hip prosthesis Numerical modeling by finite element method offers valuable information and details on the mechanical behavior of the prosthesis in terms of stress and strain distribution, load transfer, stress intensity factors, etc. An explicit analysis conducted on the behavior of microcavity and cracking in PMMA surgical cement (polymethyl methacrylate) used for a total hip prosthesis (THP) is of great importance in collecting information about the nature of the loosening phenomenon of the cement application. The rupture of orthopedic cement is practically the main cause of this loosening. Understanding the different failure mechanisms provides a significant advance in the cemented total prostheses. To do this, a numerical analysis by 3D finite element method (FEM) model of the total hip prosthesis was carried out in order to evaluate the stress levels in the different components. We focused on the effect of the microcavity rotation and the semi-elliptical crack position on the stress distribution in THP elements and on the orthopedic cement, which represents the weakest link of the prosthesis. We concluded that the two mechanical defects (Microcavity, semi-elliptical crack) exhibit more intense stresses in the THP components and record a very intense stress level and stress intensity factor KI. These mechanical defects causing damage to the PMMA around the tip of the bone debris increase the loosening state of the total hip prosthesis. 10.18149/MPM.4822022_9 finite element method mechanical crack microcavity prosthesis orthopedic cement stress von Mises strain stress intensity factors https://mpm.spbstu.ru/article/2022.87.9/ 9-Samir-Zahaf-et-al.pdf

RAR RUS 272-281 Peter the Great St. Petersburg Polytechnic University Klinkov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Archelkov

St. Petersburg, Russia

Glass formation and some physical properties in NaPO3 – LiF and NaPO3 – (0.4 AlF3 – 0.6 CaF2) systems The area of glass formation in NaPO3–LiF–(0.4AlF3 – 0.6CaF2) system was determined. The glasses were synthesized using standard melt-quenching techniques. The concentration dependencies of the glass transition temperature, refractive index, density, molar volume, microhardness, and crystallization products were obtained. In (NaPO3)100-x–(LiF)x glass the linear decrease of noted parameters was observed. The LiF additives to the phosphate network caused the formation of a "friable" glass network. In (NaPO3)100-x –(0.4AlF3 – 0.6CaF2)x system the concentration dependencies were more complex due to the formation of a mixed fluorophosphate network. It was assumed that the structural groups changed from metaphosphate (PO3−)n in the initial composition to the combinations of P(O,F)4+[MeF6]+[MeF4] in the final stage. The microhardness values (>360 kg/mm2) of NaPO3– (0.4AlF3 – 0.6CaF2) glasses with high fluoride content were comparable to lead silicate glasses, which indicates the possibility of their practical application in optical instrumentation and devices. 10.18149/MPM.4822022_10 NaPO3 – LiF fluorophosphate glass calcium fluoroaluminate glass refractive index density microhardness https://mpm.spbstu.ru/article/2022.87.10/ 10-V_A_-Klinkov%2C-V_B_-Archelkov.pdf

RAR RUS 282-288 Motilal Nehru National Institute of Technology Allahabad Kashyap

Allahabad, India

Motilal Nehru National Institute of Technology Allahabad Tripathi

Allahabad, India

Motilal Nehru National Institute of Technology Allahabad Kumar

India

Mechanical properties of marble dust reinforced aluminum matrix structural composites fabricated by stir casting process The use of aluminium and its alloys in aerospace, transportation, automobile, and power transmission is growing these days because it has good corrosion resistance, is lightweight, and has high specific strength. But aluminium and its alloys have some drawbacks, such as low absolute strength at higher temperatures, low impact resistance, low hardness, etc. In this research, the aluminium metal matrix composite has been manufactured with the help of the stir casting technique to improve the aluminium alloy's mechanical properties. Where, Al6063 has been taken as the matrix material and the graphite (Gr) (2 wt.%), glass fibre (2 wt.%), boron carbide (B4C) (4 wt.%), and marble dust (2 wt.%, 4 wt.%, and 6 wt.%) in powder form have been taken as the reinforcement materials. The present research work has been undertaken to explore marble dust as a reinforcing material as a low-cost option for improving mechanical properties. 10.18149/MPM.4822022_11 aluminum metal matrix structural composite stir casting technique graphite glass fibre boron carbide marble dust https://mpm.spbstu.ru/article/2022.87.11/ 11-Sandeep-Kashyap%2C-Hariom-Tripathi%2C-Naveen-Kumar.pdf

RAR RUS 289-299 JSC "Central Research Institute for Machine Building" Pogrebnoi

Korolev, Russia

Study of polylactide 3D-printed samples with double-layer weave Fused Deposition Modeling method (FDM) is widely used in various fields of science for prototyping and manufacturing of final functional parts. The actual problem of the FDM method is the low bond strength between the layers of printed parts. Proposed 3D-printing method is based on the formation of double-layer weave between polymer threads. An unfilled polylactide (PLA) was used for fabrication of samples to demonstrate the proposed method. PLA samples with double-layer weave obtained by fused deposition modeling method are studied. Characteristics of samples obtained by static tension test are compared. Their structure and fracture mode are investigated. It is found that double-layer weave affects bond strength between layers of 3D-printed samples. The obtained results show that the proposed method in combination with other methods can be implemented for other polymer materials and composites for local reinforcement of printed parts. 10.18149/MPM.4822022_12 adhesion mechanical properties tensile strength reinforcement double-layer weave fused deposition modeling polylactide https://mpm.spbstu.ru/article/2022.87.12/ 12-A_V_-Pogrebnoi.pdf