Effect of bamboo weight faction on mechanical properties in non-asbestos composite of motorcycle brake padY. Sukrawan, A. Hamdani & S.A. Mardani
This study aims to determine the mechanical properties of the use of brake pads based on composite materials from bamboo fiber, and to evaluate the effect of replacement of brake pad material made from asbestos with natural materials to avoid the impacts of asbestosis substances, such as cancer. The method used several stages: weighing, mixing, inserting materials in molding, compacting, and sintering. The stages were carried out in three types of composites: Composite 1 (40%...
ARTIFACTS OF STRESS RELAXATION TECHNIQUE TO FIT RECOVERY ACTIVATION PARAMETERS FOR LOW CARBON STEELSAlexander A. Vasilyev, Semen F. Sokolov, Nikita A. Golubkov, Alexander A. Zisman, Dmitry F. Sokolov & Andrey I. Rudskoy
The paper compares model predictions of recovery kinetics of low carbon steels with activation parameters determined by various experimental techniques. It is concluded that the stress relaxation method overestimates the recovery rate because the creep of stressed specimens is ignored. To avoid such errors, it is recommended to use an alternative method of double loading. The more realistic (lesser) rate of recovery with the related activation parameters complies with independent data of mechanical tests.
On the correlation between multiscale mechanisms of deformation in uniaxial dynamic straining and high velocity penetrationYu.I. Meshcheryakov, G.V. Konovalov, N.I. Zhgacheva, A.K. Divakov & E.P. Osokin
In order to identify the successive stages of developing the hierarchy of multiscale mechanisms of dynamic straining, the shock-induced mesostructure formation is studied in combined experiments. Shock tests of two kinds of aluminum alloy, 1561 and 1565 alloys were conducted in parallel in two regimes of loading: (i) under uniaxial strain conditions and (ii) in high velocity penetration. Combination of loading regimes allows the correlation in formation of multiscale structure depending on strain rate and...
Finite element modelling of ceramomatrix piezocomposites by using effective moduli method with different variants of boundary conditionsG. Iovane & A.V. Nasedkin
The paper presents an investigation of effective properties of piezocomposites of piezoceramic/polycrystallites type by using the effective moduli method, the computer modeling of representative volumes with random structure of granular heterogeneity and the finite element method to solve the homogenization problems. The effective moduli, obtained from the problems with different boundary conditions on the edges of representative volumes, are analyzed.
First principle electronic, magnetic and thermodynamic characterization of heavy fermion ternary rare earth metal alloysAman Kumar, Rahul Guatam, Satish Chand, Anuj Kumar & R.P. Singh
Ternary rare earth metal alloys (viz. GdInZn, GdTlZn and GdInCd) play a key role in a large range of current research areas, in particular those devoted to heavy fermions, valence fluctuations, magneto-strictive materials, permanent-magnet materials, spin glasses and random anisotropy systems. Thus, to understand the relevant complex behavior of Gd/M/M¹, M=In, Tl; M¹ = Zn, Cd compounds (viz. GdInZn, GdInCd and GdTlZn), in the present research article, we have been carried out the theoretical investigations...
A synthesis of BAxSR1-xTIO3 film and characterization of ferroelectric properties and its extension as random access memoryA. Hamdani, M. Komaro & Irzaman
Ferroelectric material is generally used in engineering fields for such purposes as sensors, microelectronics, etc. It also provides more advantages compared to ferromagnetic materials, especially those related to a memory storage. This is due to a stored memory produced from magnetic system only consists of 105 bits/cm2 whereas a memory from ferroelectric can be stored up to 108 bits/cm2. The objectives of this study were 1) to develop BST films on Pt (200) / SiO2...
Employment of Eulerian, Lagrangian, and arbitrary Lagrangian-Eulerian description for crack opening problemE.A. Ivanova, D.V. Matyas & M.D. Stepanov
Numerical study of crack opening in the solid material of rock formation is presentedin this article. Initially introduced straight-line crack is widened by increasing internal pressure. The crack shape evolution resembles hydraulic fracturing and is considered as a transient process. Commercial code LS-DYNA was employed to obtain solutions by three types of descriptions, they are compared to the solution obtained in Eulerian description by a program based on the finite-volume method and written in Python...
This paper presents a direct boundary element approach for anisotropic static three-dimensional linear elastic problems. Formulation is based on the use of regularized boundary integral equation (BIE) for displacements. This BIE is weakly singular which is advantageous compared to the traditional strongly singular formulations. The displacement static fundamental solution is expressed in terms of an integral over a circumference with a unit radius. For the efficient numerical implementation of these fundamental solutions an interpolation scheme...
Investigation and modeling the austenitization kinetics of steels with complex microstructure under continuous heatingA.A. Vasilyev, D.F. Sokolov, S.F. Sokolov & A.I. Rudskoy
An experimental investigation of the austenitization under continuous heating of various microstructures of 8 industrial steel grades with wide range of chemical compositions was carried out. A quantitative mathematical model describing the austenitization kinetics of the steels with complex microstructure and predicting austenite grain size in dependence on the chemical composition, volume fractions of structural components (ferrite, pearlite, bainite, martensite), ferrite grain size and heating rate, was developed. Values of the model empirical parameters were...
The results of experimental study of mechanical properties of samples of sand-lime brick under dynamic loading are presented. The tests were carried out using the traditional Kolsky method and its modification - dynamic splitting (the so-called «Brazilian test»). The laws of change in strength and time properties of the investigated material are determined in the strain rate range of 3·102 -2.5·103 s -1 under compression and in the stress rate range of 2·101 -3·102 GPa/s...
Evolution of steam and gas plume generation on the surface of an irradiated metal was investigated experimentally. It is shown that on using GOR-100M operating in a free oscillating regime the form of a crater developed in an irradiated target beingin water and air differs drastically.It is found that the substantial difference in the forms of crater surfaces developed is determined by different character of plasma, steam and gas mixture flow. doi: 10.18720/MPM.4112019_15
The search for technological options for obtaining a solid assembly with small values of deformations determines the need to use a combined thermal effect on the zone of connection of extended elements made of carbon steel. Prediction of residual stress values occurring in the heat-affected zone of an assembly is difficult because of the influence of a significant number of factors: heat removal conditions, volume and material properties, etc. To calculate the residual stresses in...
The present work divulges about ultrasonic characterization on the elastic and mechanical properties of borate doped ternary glass systems. The Ultrasonic wave velocity (longitudinal and shear) and density for the two ternary (B2O3-WO3-Bi2O3) BTB and (B2O3-SiO2- Bi2O3) BSB glass systems have been measured at room temperature by using Pulse–Echo technique at 5 MHz. The glass samples were prepared by melt-quenching method. The measured experimental values have been utilized to evaluate the Elastic modulus, Poisson’s ratio,...
Numerically-analytically studying fundamental solutions of 3-D dynamics of partially saturated poroelastic bodiesLeonid A. Igumnov, Andrey N. Petrov, Aleksander A. Belov, Anatoly A. Mironov, Aleksander K. Lyubimov & Denis Yu. Dianov
A mathematical model of a porous material is considered, in which an elastic skeleton and two fluid phases filling the pores are discerned. The dynamic equations are written in Laplace-type representation for unknown displacement functions of the skeleton and pore pressures of the fillers. The fundamental solutions of the defining differential equations are numerically-analytically studied. A solution in the time-domain is constructed, using the time-step method of numerically inverting Laplace transform.
Combined effect of boron alloying and ausforming on austenite transformation in low carbon steels under continuous coolingA.A. Vasilyev, D.F. Sokolov, S.F. Sokolov, A.A. Zisman & N.G. Kolbasnikov
The combined effect of boron addition and ausforming on the structure of low carbon low alloyed steel after the transformation of austenite has been investigated in a wide range of cooling rates. It is shown that boron hinders formation of polygonal ferrite in continuous cooling regardless of austenite predeformation and suppresses appearance of acicular ferrite. A qualitative explanation of this effect is proposed in terms of the deformation induced boron segregation on boundaries of austenite...
The purpose of this study was to investigate the effect of conductivity and permittivity on wave propagation and attenuation on the plate using FDTD (The Finite Difference Time Domain). The FDTD method is used to describe electromagnetic waves. The method used in this study was the basic principle of the numerical approach of differential equations by taking into account boundary conditions, stability, and absorbing boundary conditions. The results of the simulation showed that if the...
The article presents the results of the study of nonlinear elastic properties of rubber-cord shells under static loading. A method for determining nonlinear properties is proposed. The approximations obtained in this case satisfactorily describe the results of the experiments
This paper deals with the issue of fatigue failure of materials. The process of generation of fatigue properties for the steel 08PS is described and obtained in the laboratory. The technique of conducting virtual tests for cyclic durability for vehicles is proposed. Virtual tests for cyclic durability by using the finite element method on the example of an off-road car body are performed.
The paper presents the results of a study of the plasticizing effect of oligomers based on 4.4′-dihydroxydiphenyl and 4.4′-dichlorodiphenylsulfone, as well as 4.4′-dihydroxydiphenylpropane (Diane) and 4.4′-dichlorodiphenylsulfone on polyphenylene sulfone and highly filled composites on its basis. It was established that these oligomers are quite effective plasticizers during processing, increasing the melt flow rate and retaining elastic-strength properties at concentrations up to 20%. At the same time, they have high heat resistance and the necessary compatibility...
Nanocomposite materials electroplating for nano- and micro-fabrication with Si mold and LIGA-like technological process is proposed. UV lithography based on SU-8 photoresist for ultra-thick 3D structures is described. Two-stage process for high aspect ratio vertical metal structures fabrication is considered. Possible applications of the proposed technological approaches for advanced optical systems are described. doi: 10.18720/MPM.4112019_10
The possibilities of predicting thermal fatigue durability for single crystal on the base of coupled thermo-electro-mechanical finite-element modeling with using of deformational criterion and microstructural models of inelastic deformation are investigated. Results of thermal and stress-strain state simulations of single-crystal corset specimens under cyclic electric heating and cooling are presented and discussed. Comparison of computational results with experimental data for various single-crystal nickel-based superalloys demonstrates a good accuracy in the prediction of the number of...
More research interest is developing rapidly on two dimensional (2D) materials owing to their excellent electro-optic properties to develop next generation of electronics and highly functional devices. Among well-known and widely used 2D materials, boron nitride (BN) is an electrical insulator with a band gap of 5.5 eV, and attests high chemical stability, outstanding mechanical properties, and high thermal conductivity. Accordingly, BN is considered as a promising candidate to improve the heat dissipation material performance....
Physical and information parameters of nanoscale electronic elements as a part of computing systems with neural network architectureMikhail Makarov
Problem of ensuring specified reliability indices when designing computation components of the telecommunication systems built via use of a nanoscale electronic element base is considered. Computer models of the computation components with neural network architecture and integrated nanoscale titanium oxide-based memristors and nanoscale graphene-based field-effect transistors are studied. Correlation between the physical and information parameters, integrated into the system of nanoscale electronic elements, as well as an impact of parameter variation on the system reliability,...
Influence of an external electric field on particle generation during laser-plasma treating of metalsA.Yu. Ivanov, A.V. Kapytski & S.V. Vasiliev
Evolution of plasma torch at the surface of some metals (Cu, Al, Sn, Pb) induced by varying external electric field of different polarity from 0 to 106 V/m-1 in the course of laser processing with the mean radiation flux density ∼106 W/cm-2 is studied. A size of the target material droplets, carried out from the irradiated zone, becomes several times less, as the field strength amplitude grows, independently of the field polarity. doi: 10.18720/MPM.4112019_16
Crystalline structure and composition of the ZnO films grown by atomic layer deposition (ALD) on the n- and p-type Si (100) substrates with a SiC buffer layer were studied. The SiC buffer layers have been synthesized by a novel method of atomic substitution (partial chemical replacement) of Si atoms by carbon atoms in the subsurface layer of the Si substrate. A four-component epitaxial texture of ZnO in a direction close to  on the n-...
Peter the Great St. Petersburg Polytechnic University10
N. I. Lobachevsky State University of Nizhny Novgorod8
Institute of Problems of Mechanical Engineering8
Bauman Moscow State Technical University3
//ror.org/02x91aj62:Peter the Great St. Petersburg Polytechnic University3
Tver State Technical University2
Kuban State University2
Saint Petersburg State University2