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It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1<
Evgeny Shilko; Igor Konovalenko; Ivan Konovalenko. Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete. Materials 2021, 14, 4011 .
AMA StyleEvgeny Shilko, Igor Konovalenko, Ivan Konovalenko. Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete. Materials. 2021; 14 (14):4011.
Chicago/Turabian StyleEvgeny Shilko; Igor Konovalenko; Ivan Konovalenko. 2021. "Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete." Materials 14, no. 14: 4011.
A promising composite material for tribotechnical applications based on aluminum bronze with reinforcing boron carbide particles fabricated by a special electron beam additive deposition technique was studied experimentally and numerically. Tribological experiments showed that reinforcing by carbide particles allowed reducing the coefficient of friction from 0.26 to 0.19 and improving the wear resistance by 2.2 times. Computer modeling reveals two main factors playing a significant role in the friction behavior of the studied metal matrix composite: the mechanical effect of reinforcing ceramic inclusions and effective hardening of the metal matrix due to the peculiarities of the 3D electron beam printing. The mechanical effect of hardening inclusions determines a more rounded shape of wear particles, preventing wedging, and thereby increasing the stability of friction. Strengthening the metal matrix leads to reducing the number of wear particles.
Alexey Yu. Smolin; Andrey V. Filippov; Evgeny V. Shilko. FRICTION BEHAVIOR OF ALUMINUM BRONZE REINFORCED BY BORON CARBIDE PARTICLES. Facta Universitatis, Series: Mechanical Engineering 2021, 19, 051 -065.
AMA StyleAlexey Yu. Smolin, Andrey V. Filippov, Evgeny V. Shilko. FRICTION BEHAVIOR OF ALUMINUM BRONZE REINFORCED BY BORON CARBIDE PARTICLES. Facta Universitatis, Series: Mechanical Engineering. 2021; 19 (1):051-065.
Chicago/Turabian StyleAlexey Yu. Smolin; Andrey V. Filippov; Evgeny V. Shilko. 2021. "FRICTION BEHAVIOR OF ALUMINUM BRONZE REINFORCED BY BORON CARBIDE PARTICLES." Facta Universitatis, Series: Mechanical Engineering 19, no. 1: 051-065.
Methods of particles are now recognized as an effective tool for numerical modeling of dynamic mechanical and coupled processes in solids and liquids. This chapter is devoted to a brief review of recent advances in the development of the popular particle-based discrete element method (DEM). DEM is conventionally considered as a highly specialized technique for modeling the flow of granular media and the fracture of brittle materials at micro- and mesoscopic scales. However, in the last decade, great progress has been made in the development of the formalism of this method. It is largely associated with the works of the scientific group of Professor S. G. Psakhie. The most important achievement of this group is a generalized formulation of the method of homogeneously deformable discrete elements. In the chapter, we describe keystones of this implementation of DEM and a universal approach that allows one to apply various rheological models of materials (including coupled models of porous fluid-saturated solids) to a discrete element. The new formalism makes possible qualitative expansion of the scope of application of the particle-based discrete element technique to materials with various rheological properties and to the range of considered scales form microscopic to macroscopic. The capabilities of this method are especially in demand in the study of the features of contact interaction of materials. To demonstrate these capabilities, we briefly review two recent applications concerning (a) the effect of adhesive interaction on the regime of wear of surface asperities under tangential contact of bodies and (b) the nonmonotonic dependence of the stress concentration in the neck of the human femur on the dynamics of hip joint contact loading.
Evgeny V. Shilko; Alexey Yu. Smolin; Andrey V. Dimaki; Galina M. Eremina. Particle-Based Approach for Simulation of Nonlinear Material Behavior in Contact Zones. Materials with Internal Structure 2020, 67 -89.
AMA StyleEvgeny V. Shilko, Alexey Yu. Smolin, Andrey V. Dimaki, Galina M. Eremina. Particle-Based Approach for Simulation of Nonlinear Material Behavior in Contact Zones. Materials with Internal Structure. 2020; ():67-89.
Chicago/Turabian StyleEvgeny V. Shilko; Alexey Yu. Smolin; Andrey V. Dimaki; Galina M. Eremina. 2020. "Particle-Based Approach for Simulation of Nonlinear Material Behavior in Contact Zones." Materials with Internal Structure , no. : 67-89.
Recent studies have shown that the use of membranes based on artificial nanoporous materials can be effective for desalination and decontamination of water, separation of ions and gases as well as for solutions to other related problems. Before the expensive stages of synthesis and experimental testing, the search of the optimal dimensions and geometry of nanopores for the water desalination membranes can be done using computer-aided design. In the present study, we propose and examine the assumption that rectangular nanopores with a high aspect ratio would demonstrate excellent properties in terms of water permeation rate and ion rejection. Using the non-equilibrium molecular dynamic simulations, the properties of promising hexagonal boron nitride (h-BN) membranes with rectangular nanopores were predicted. It has been found that not only the nanopore width but also its design (“armchair” or “zigzag”) determines the permeability and ion selectivity of the h-BN-based membrane. The results show that membranes with a zigzag-like design of nanopores of ~6.5 Å width and the armchair-like nanopores of ~7.5 Å width possess better efficiency compared with other considered geometries. Moreover, the estimated efficiency of these membranes is higher than that of any commercial membranes and many other previously studied single-layer model membranes with other designs of the nanopores.
Alexey A. Tsukanov; Evgeny V. Shilko. Computer-Aided Design of Boron Nitride-Based Membranes with Armchair and Zigzag Nanopores for Efficient Water Desalination. Materials 2020, 13, 5256 .
AMA StyleAlexey A. Tsukanov, Evgeny V. Shilko. Computer-Aided Design of Boron Nitride-Based Membranes with Armchair and Zigzag Nanopores for Efficient Water Desalination. Materials. 2020; 13 (22):5256.
Chicago/Turabian StyleAlexey A. Tsukanov; Evgeny V. Shilko. 2020. "Computer-Aided Design of Boron Nitride-Based Membranes with Armchair and Zigzag Nanopores for Efficient Water Desalination." Materials 13, no. 22: 5256.
Surface temperature is among crucial factors which control wear during sliding dry contact. Using computer modeling, we study the possibility to achieve close to zero rate of surface wear during sliding friction of the special type of materials which possess negative thermal expansion. The numerical simulations reveal two wear regimes for materials with negative thermal expansion coefficient as dependent on the applied normal stress level. When the applied stress is lower than that of a critical level, a steady almost zero wear rate and nanorough surface are achieved during friction. Otherwise, wear rate is of the same order of magnitude as for “traditional” materials with positive thermal expansion coefficient. The critical stress value is analyzed depending on the material's mechanical, thermophysical, and surface roughness characteristics.
Aleksandr S. Grigoriev; Evgeny V. Shilko; Andrey I. Dmitriev; Sergey Yu. Tarasov. Suppression of wear in dry sliding friction induced by negative thermal expansion. Physical Review E 2020, 102, 042801 .
AMA StyleAleksandr S. Grigoriev, Evgeny V. Shilko, Andrey I. Dmitriev, Sergey Yu. Tarasov. Suppression of wear in dry sliding friction induced by negative thermal expansion. Physical Review E. 2020; 102 (4):042801.
Chicago/Turabian StyleAleksandr S. Grigoriev; Evgeny V. Shilko; Andrey I. Dmitriev; Sergey Yu. Tarasov. 2020. "Suppression of wear in dry sliding friction induced by negative thermal expansion." Physical Review E 102, no. 4: 042801.
An experimental investigation of the phenomenon of diffusion of the solution components in nanosized pores is extremely difficult and in certain cases impossible. An effective approach to obtaining qualitative and quantitative estimates of the diffusion process characteristics is computer simulation. Relying on the method of dissipative particle dynamics, a nanoscale numerical model is proposed for estimating the value of diffusion coefficient of the dissolved substance molecules in the pores of different sizes. An aqueous solution of doxorubicin, an antitumor antibiotic, in the pores of hydroxyapatite (a promising carrier medium for solving the problems of targeted administration of highly toxic drugs) is considered as a model system. Using the proposed model, the diffusion coefficient of doxorubicin in the pores of different linear sizes is evaluated at different volume concentrations of the antibiotic. In particular, it is found out that with an increase in the pore size the diffusion coefficient of doxorubicin increases by an order of magnitude and, starting from the pore size of 300 nm, it attains saturation. An increase in the antibiotic concentration from 0.1 to 5% gives rise to a decrease in the diffusion coefficient by more than a factor of 1.5. The developed model can be applied for solving the problems of predicting the release rate of the solution components (including drug molecules) from the pore volume of different solid-phase carrier media.
E. V. Shil’Ko; I. V. Dudkin; A. Yu. Smolin; K. V. Krukovskii; A. I. Lotkov. Estimation of the Diffusion Coefficient of Doxorubicin Molecules in a Water Solution in the Volume of a Porous Carrier Medium. Russian Physics Journal 2020, 62, 2319 -2323.
AMA StyleE. V. Shil’Ko, I. V. Dudkin, A. Yu. Smolin, K. V. Krukovskii, A. I. Lotkov. Estimation of the Diffusion Coefficient of Doxorubicin Molecules in a Water Solution in the Volume of a Porous Carrier Medium. Russian Physics Journal. 2020; 62 (12):2319-2323.
Chicago/Turabian StyleE. V. Shil’Ko; I. V. Dudkin; A. Yu. Smolin; K. V. Krukovskii; A. I. Lotkov. 2020. "Estimation of the Diffusion Coefficient of Doxorubicin Molecules in a Water Solution in the Volume of a Porous Carrier Medium." Russian Physics Journal 62, no. 12: 2319-2323.
A discrete-element based model of elastic-plastic materials with non-ideal plasticity and with an account of both cohesive and adhesive interactions inside the material is developed and verified. Based on this model, a detailed study of factors controlling the modes of adhesive wear is performed. Depending on the material and loading parameters, we observed three main modes of wear: slipping, plastic grinding, cleavage, and breakaway. We find that occurrence of a particular mode is determined by the combination of two dimensionless material parameters: (1) the ratio of the adhesive stress to the pure shear strength of the material, and (2) sensitivity parameter of material shear strength to local pressure. The case study map of asperity wear modes in the space of these parameters has been constructed. Results of this study further develop the findings of the widely discussed studies by the groups of J.-F. Molinari and L. Pastewka.
Andrey V. Dimaki; Evgeny V. Shilko; Ivan V. Dudkin; Sergey G. Psakhie; Valentin L. Popov. Role of Adhesion Stress in Controlling Transition between Plastic, Grinding and Breakaway Regimes of Adhesive Wear. Scientific Reports 2020, 10, 1 -13.
AMA StyleAndrey V. Dimaki, Evgeny V. Shilko, Ivan V. Dudkin, Sergey G. Psakhie, Valentin L. Popov. Role of Adhesion Stress in Controlling Transition between Plastic, Grinding and Breakaway Regimes of Adhesive Wear. Scientific Reports. 2020; 10 (1):1-13.
Chicago/Turabian StyleAndrey V. Dimaki; Evgeny V. Shilko; Ivan V. Dudkin; Sergey G. Psakhie; Valentin L. Popov. 2020. "Role of Adhesion Stress in Controlling Transition between Plastic, Grinding and Breakaway Regimes of Adhesive Wear." Scientific Reports 10, no. 1: 1-13.
E.V. Shilko; Institute of strength physics and materials science of SB RAS; Et Al.. Evaluation of the diffusion coefficient of doxorubicine molecules in aqueous solution in the volume of porous carrier. Izvestiya vysshikh uchebnykh zavedenii. Fizika 2019, 146 -150.
AMA StyleE.V. Shilko, Institute of strength physics and materials science of SB RAS, Et Al.. Evaluation of the diffusion coefficient of doxorubicine molecules in aqueous solution in the volume of porous carrier. Izvestiya vysshikh uchebnykh zavedenii. Fizika. 2019; (12):146-150.
Chicago/Turabian StyleE.V. Shilko; Institute of strength physics and materials science of SB RAS; Et Al.. 2019. "Evaluation of the diffusion coefficient of doxorubicine molecules in aqueous solution in the volume of porous carrier." Izvestiya vysshikh uchebnykh zavedenii. Fizika , no. 12: 146-150.
There are many methods for direct assessment of the mechanical properties of bone tissue, such as tension, compression, and three-point bending tests. However, all these methods are used for testing the bone extracted from the body and usually specially treated, and therefore do not provide the characteristics necessary for clinical practice. Recently, however, indentation has become positioned as a procedure for clinical use with minimal invasiveness. In addition, with the help of microindentation, a local study of the affected areas of bone tissue is possible. At present, non-invasive methods for diagnosing bone properties are being actively developed, based on visualization of the structure of bone tissue, followed by importing the information obtained into computer modeling software systems. This paper presents a numerical model of the mechanical behavior of cancellous bone tissue as a poroelastic body. To test the model, the influence of such factors as the presence of fluid, loading with holding, loading rate, as well as the effect of permeability on the mechanical response of the bone tissue when the hard tip being penetrated was investigated.
Galina M. Eremina; Alexey Yu. Smolin; Evgeniy V. Shilko. Numerical modeling of the indentation of cancellous bone. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 2019, 2167, 020090 .
AMA StyleGalina M. Eremina, Alexey Yu. Smolin, Evgeniy V. Shilko. Numerical modeling of the indentation of cancellous bone. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019. 2019; 2167 (1):020090.
Chicago/Turabian StyleGalina M. Eremina; Alexey Yu. Smolin; Evgeniy V. Shilko. 2019. "Numerical modeling of the indentation of cancellous bone." PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 2167, no. 1: 020090.
In the paper, we developed a macroscopic discrete element model of permeable fluid-saturated materials with solid skeleton characterized by viscoelastic rheological properties. The Biot's linear model of poroelasticity was used as a mathematical basis for describing the mechanical interrelation between the solid skeleton and interstitial fluid. Using this model, we numerically studied the dependences of the effective Young's modulus and strength of fluid-saturated viscoelastic materials on the loading rate, sample size and the mechanical parameters, which determine the relaxation time of the solid-phase skeleton and the time scale of redistribution of fluid in the pore space. We revealed two dimensionless control parameters that determine the dynamic values of the effective mechanical characteristics of the samples under compression loading. We obtained the general relations that describe the above-mentioned dependences in terms of the two proposed control parameters. These relations have a logistic nature and are described by sigmoid functions. The importance of the proposed empirical expressions is determined by the possibility of their application for predicting the mechanical response of fluid-saturated materials of different nature (bone tissue, rocks, porous materials with polymeric skeleton, including elastomers, etc.) under dynamic loading.
E V Shilko; A V Dimaki; Valentin L. Popov. Particle-based modeling of the mechanical behavior of porous fluid-saturated viscoelastic solids. Journal of Physics: Conference Series 2019, 1391, 012116 .
AMA StyleE V Shilko, A V Dimaki, Valentin L. Popov. Particle-based modeling of the mechanical behavior of porous fluid-saturated viscoelastic solids. Journal of Physics: Conference Series. 2019; 1391 (1):012116.
Chicago/Turabian StyleE V Shilko; A V Dimaki; Valentin L. Popov. 2019. "Particle-based modeling of the mechanical behavior of porous fluid-saturated viscoelastic solids." Journal of Physics: Conference Series 1391, no. 1: 012116.
In the framework of a single computational approach (particle method), we developed a coupled microscale computer model of liquid-saturated micropores in a solid-phase carrier. Within the model, the solid-phase and liquid-phase components of the contrast system are modeled on the basis of the formalism of homogeneously deformable discrete elements. For computer simulation of flow of complex liquids (including aqueous solutions of drugs) in the micropore volume of the carrier, a new implementation of discrete elements has been developed. This implementation borrows key advantages of the dissipative particle dynamics method. Using the system of adjacent slit-shaped micropores in hydroxyapatite filled with water as an example, we showed an adequacy of the developed discrete element based formalism and its applicability for microscale study of the coupled problems including deformation of solid-phase skeleton and flow of liquids in micropore space.
E V Shilko; A S Grigoriev; A I Lotkov. Development of the formalism of the discrete element method for the study of the mechanical behavior of liquid-saturated porous materials on a pore scale. Journal of Physics: Conference Series 2019, 1391, 012023 .
AMA StyleE V Shilko, A S Grigoriev, A I Lotkov. Development of the formalism of the discrete element method for the study of the mechanical behavior of liquid-saturated porous materials on a pore scale. Journal of Physics: Conference Series. 2019; 1391 (1):012023.
Chicago/Turabian StyleE V Shilko; A S Grigoriev; A I Lotkov. 2019. "Development of the formalism of the discrete element method for the study of the mechanical behavior of liquid-saturated porous materials on a pore scale." Journal of Physics: Conference Series 1391, no. 1: 012023.
The paper is devoted to the development of the formalism of the computational method of discrete elements (DEM) for describing the mechanical behavior of consolidated viscoelastic materials. We considered an advanced implementation of DEM, namely, the method of movable cellular automata (MCA). A feature of this implementation of DEM is the use of a generalized many-body formulation of the relations for the forces of element-element interaction. 3D numerical models of viscoelastic material with a spectrum of relaxation times (Kelvin and Maxwell models, the standard model of elastomers, and others) were developed within the formalism of MCA. The correctness of the developed discrete element formalism and its applicability for modeling the processes of deformation and fracture of viscoelastic materials under dynamic loading are shown using the standard model of elastomers as an example. The relevance of the results is determined by the prospects for the further development of DEM and its application to study and predict the mechanical response of viscoelastic materials of various nature under dynamic loading including contact problems.
Evgeny Shilko; Ivan Dudkin; Aleksandr Grigoriev. The development of the formalism of movable cellular automata for modeling the nonlinear mechanical behavior of viscoelastic materials. EPJ Web of Conferences 2019, 221, 01052 .
AMA StyleEvgeny Shilko, Ivan Dudkin, Aleksandr Grigoriev. The development of the formalism of movable cellular automata for modeling the nonlinear mechanical behavior of viscoelastic materials. EPJ Web of Conferences. 2019; 221 ():01052.
Chicago/Turabian StyleEvgeny Shilko; Ivan Dudkin; Aleksandr Grigoriev. 2019. "The development of the formalism of movable cellular automata for modeling the nonlinear mechanical behavior of viscoelastic materials." EPJ Web of Conferences 221, no. : 01052.
Igor Konovalenko; Evgenii Shilko; Vladimir Ovcharenko; Sergey Psakhie. Investigation of Structural Factors that Increase the Mechanical Properties of Surface Layers Modified by Pulsed Electro-Beam Irradiation. Metal Working and Material Science 2019, 21, 1 .
AMA StyleIgor Konovalenko, Evgenii Shilko, Vladimir Ovcharenko, Sergey Psakhie. Investigation of Structural Factors that Increase the Mechanical Properties of Surface Layers Modified by Pulsed Electro-Beam Irradiation. Metal Working and Material Science. 2019; 21 (1):1.
Chicago/Turabian StyleIgor Konovalenko; Evgenii Shilko; Vladimir Ovcharenko; Sergey Psakhie. 2019. "Investigation of Structural Factors that Increase the Mechanical Properties of Surface Layers Modified by Pulsed Electro-Beam Irradiation." Metal Working and Material Science 21, no. 1: 1.
The paper is devoted to the numerical study of the dependence of uniaxial compressive strength of permeable fluid-saturated brittle solids on the loading rate. We analyzed the influence of strain rate, sample size, permeability of the material, fluid viscosity and a coefficient of the influence of pore pressure on the stress state of solid skeleton. We have shown that dynamic values of elastic modulus and strength of the sample is a unique nonlinear sigmoid-like function of the dimensionless parameter that characterizes the ratio of applied strain rate to interstitial fluid flow rate. We proposed the unified approximating function, which describes numerically derived dependences with good accuracy. The results of the study are relevant for estimating and forecasting dynamic compressive strength of the samples of different fluid-saturated brittle solids. Moreover, the proposed expression can be applied to determine unknown values of the fluid effect constants on the basis of reducing the experimental data to a unified curve.
Evgeny V. Shilko; Andrey V. Dimaki; Alexey Yu. Smolin; Sergey G. Psakhie. The determining influence of the competition between pore volume change and fluid filtration on the strength of permeable brittle solids. Procedia Structural Integrity 2018, 13, 1508 -1513.
AMA StyleEvgeny V. Shilko, Andrey V. Dimaki, Alexey Yu. Smolin, Sergey G. Psakhie. The determining influence of the competition between pore volume change and fluid filtration on the strength of permeable brittle solids. Procedia Structural Integrity. 2018; 13 ():1508-1513.
Chicago/Turabian StyleEvgeny V. Shilko; Andrey V. Dimaki; Alexey Yu. Smolin; Sergey G. Psakhie. 2018. "The determining influence of the competition between pore volume change and fluid filtration on the strength of permeable brittle solids." Procedia Structural Integrity 13, no. : 1508-1513.
The paper is devoted to a numerical analysis of the applicability of Rabinowicz’s energy-based macroscopic criterion of adhesive wear mode for prediction of the dominating mechanism of wear of surface asperities in elastic-plastic materials with finite values of the strain hardening coefficient. The results of the study confirmed the adequacy of this criterion in the case of “highly plastic” materials characterized by “low” values of yield stress and strain hardening coefficient, which do not exceed half of the tensile strength and Young’s modulus respectively. We showed that at larger values of these mechanical parameters the critical size of asperities is determined not only (and not so much) by the mechanical characteristics of the material, but mainly by the peculiarities of the contact interaction of asperities.
Ivan V. Dudkin; Evgeny V. Shilko; Andrey V. Dimaki. Numerical study of the limitations of the energy-based criterion for the formation of wear debris. AIP Conference Proceedings 2018, 2051, 020069 .
AMA StyleIvan V. Dudkin, Evgeny V. Shilko, Andrey V. Dimaki. Numerical study of the limitations of the energy-based criterion for the formation of wear debris. AIP Conference Proceedings. 2018; 2051 (1):020069.
Chicago/Turabian StyleIvan V. Dudkin; Evgeny V. Shilko; Andrey V. Dimaki. 2018. "Numerical study of the limitations of the energy-based criterion for the formation of wear debris." AIP Conference Proceedings 2051, no. 1: 020069.
Bone tissue might fail under the influence of external mechanical factors or diseases. Scaffolds are widely used for replacing portions of bone tissue or an entire bone skeleton element. A large part of the research of their mechanical behavior and interaction with surrounding biological tissues are theoretical studies. This paper is a review that examines the key theoretical works in the field of biomechanics of framework materials used for making bone implants. The literature data on the models used to describe the mechanical behavior of framework materials and their interaction with biological fluids is presented.
Galina M. Eremina; Evgeniy V. Shilko; Alexey Yu. Smolin. Mechanobiology of framework material used for manufacture of bone tissue implants. Review of mathematical models. AIP Conference Proceedings 2018, 2051, 020078 .
AMA StyleGalina M. Eremina, Evgeniy V. Shilko, Alexey Yu. Smolin. Mechanobiology of framework material used for manufacture of bone tissue implants. Review of mathematical models. AIP Conference Proceedings. 2018; 2051 (1):020078.
Chicago/Turabian StyleGalina M. Eremina; Evgeniy V. Shilko; Alexey Yu. Smolin. 2018. "Mechanobiology of framework material used for manufacture of bone tissue implants. Review of mathematical models." AIP Conference Proceedings 2051, no. 1: 020078.
Current geophysical experience shows that conventional measures proposed by the world scientific community to withstand seismic hazard, including various types of seismic zoning and earthquake prognosis, as well as costly earthquake-proof building, prove to be insufficient as they do not allow to avoid the destructive consequences of very strong earthquakes. Therefore, in recent decades, many geophysicists proposed new approaches to ensuring seismic safety. The present paper briefly discusses the results of geophysical studies, which are based on carrying out complex man-caused impacts on segments of seismically active fault zones. We discuss the prospects of formulation of a multidisciplinary approach to seismically safe reduce of the excess elastic strain energy in fault zones to a safe background level for hundreds of years. Potential realizability of the proposed approach is confirmed by the experience of small-scale tests in the fault segments of the Baikal rift zone. The key issues that inevitably arise during complex large-scale testing are considered by the example of the Arshan segment of the Tunkinsky riftogenic fault.
Valery V. Ruzhich; Sergey G. Psakhie; Evgeny V. Shilko; Andrey G. Vakhromeev; Elena A. Levina. On the possibility of development of the technology for managing seismotectonic displacements in fault zones. AIP Conference Proceedings 2018, 2051, 020261 .
AMA StyleValery V. Ruzhich, Sergey G. Psakhie, Evgeny V. Shilko, Andrey G. Vakhromeev, Elena A. Levina. On the possibility of development of the technology for managing seismotectonic displacements in fault zones. AIP Conference Proceedings. 2018; 2051 (1):020261.
Chicago/Turabian StyleValery V. Ruzhich; Sergey G. Psakhie; Evgeny V. Shilko; Andrey G. Vakhromeev; Elena A. Levina. 2018. "On the possibility of development of the technology for managing seismotectonic displacements in fault zones." AIP Conference Proceedings 2051, no. 1: 020261.
The paper presents the development of recently proposed kinetic model of dynamic mechanical behavior of brittle solids. The model uses the ideas of kinetic theory of strength to describe the inelastic deformation and fracture. The main feature of the modified dynamic model is the introduction of two relaxation times, which determine the patterns of inelastic deformation under dynamic loading, including the dependences of the values of the cohesion and strain hardening coefficient on the strain rate. These relaxation times have the meaning of a generation time of damage of the smallest ranks and a characteristic time of formation of a system of local damage and cracks of the greatest rank. The advantage of a developed dynamic model is the possibility of its implementation within different conventional models of inelasticity of brittle solids. In the paper we implemented the kinetic model within the classical “quasi-static” Nikolaevsky’s plasticity model (non-associated plastic flow rule with the plasticity criterion in the form of Mises–Schleicher). We verified the model and determined its parameters by the example of high-strength concrete. The developed dynamic model can be implemented within the framework of various Lagrangian numerical methods (including finite and discrete element methods) using an explicit integration scheme.
Aleksandr S. Grigoriev; Evgeny V. Shilko; Vladimir A. Skripnyak; Sergey G. Psakhie. The model of dynamic inelastic behavior of brittle solids based on the concept of finite fracture time. AIP Conference Proceedings 2018, 2051, 020102 .
AMA StyleAleksandr S. Grigoriev, Evgeny V. Shilko, Vladimir A. Skripnyak, Sergey G. Psakhie. The model of dynamic inelastic behavior of brittle solids based on the concept of finite fracture time. AIP Conference Proceedings. 2018; 2051 (1):020102.
Chicago/Turabian StyleAleksandr S. Grigoriev; Evgeny V. Shilko; Vladimir A. Skripnyak; Sergey G. Psakhie. 2018. "The model of dynamic inelastic behavior of brittle solids based on the concept of finite fracture time." AIP Conference Proceedings 2051, no. 1: 020102.
Problems associated with a qualitative increase in the selectivity of fluid filtration remain the major challenge in a variety of areas such as fluid transport through porous materials and media, ion separation, water desalination and purification, and many others. A promising way to solve these problems is to design and develop membranes with slit-shaped nanopores. In the paper, we studied the selectivity and permeability of slitshaped nanosized pores in the natural mineral (hydroxyapatite) with the use of the nonequilibrium molecular dynamics approach with all-atom models. We showed that the subnanometer-wide slit-shaped pores in hydroxyapatite are able to demonstrate both good salt rejection and relatively high water permeability. In particular, the numerically predicted water permeability of hydroxyapatite with 0.4 nm thick slit-shaped nanopores reaches about 200 L/(m2 h bar) that is higher than that of commercial membranes and has the same order of magnitude as the theoretically predicted water permeability through single-layer MoS2 nanoporous membranes. An increase in the nanopore thickness is accompanied by a multiple growth in permeability, which is comparable with advanced 2D-CAP (2D-conjugated aromatic polymer) membranes, but in so doing the filtration selectivity is lost. The results show that nanoporous materials with the connected network of slit-shaped nanopores is a promising filter material for water treatment including seawater desalination and other important technical and environmental applications.
A. A. Tsukanov; E. V. Shilko; E. Gutmanas; S. G. Psakhie. Selective Filtration of Fluids in Materials with Slit-Shaped Nanopores. Physical Mesomechanics 2018, 21, 538 -545.
AMA StyleA. A. Tsukanov, E. V. Shilko, E. Gutmanas, S. G. Psakhie. Selective Filtration of Fluids in Materials with Slit-Shaped Nanopores. Physical Mesomechanics. 2018; 21 (6):538-545.
Chicago/Turabian StyleA. A. Tsukanov; E. V. Shilko; E. Gutmanas; S. G. Psakhie. 2018. "Selective Filtration of Fluids in Materials with Slit-Shaped Nanopores." Physical Mesomechanics 21, no. 6: 538-545.
This paper presents a new approach to describe the mechanical behavior of semi-crystalline polymers, the plastic deformation of which is determined by their two-phase structure. To describe the plastic behavior of semi-crystalline polymers, a two-phase model is used. In the framework of this model, one phase is in a hard (crystalline) state, and the other in a soft (amorphous) state. The two-phase material is modeled by a single-phase homogeneous continuum based on the approximation of the effective medium. It is assumed that two infinitely close material points of the continuum are connected in series by elastic and viscous bonds, which corresponds to the Maxwell model. It is shown that, in this case, the Maxwell continuum is a pseudo-Euclidean space. Generalizing the definition of defects from a three-dimensional space to a four-dimensional pseudo-Euclidean space, we obtained a dynamic system of nonlinear, interrelated equations to describe the behavior of translational-type defects in the solid phase and dynamic defects in the amorphous phase. As an example of an application for these equations, the phenomenon of creep under uniaxial loading is considered. It is shown that the formalism of the proposed two-phase model makes it possible to describe creep phenomenon regularities, which correspond to both the aging theory and the flow theory.
Yurii V. Grinyaev; Nadezhda V. Chertova; Evgeny V. Shilko; Sergey G. Psakhie. The Continuum Approach to the Description of Semi-Crystalline Polymers Deformation Regimes: The Role of Dynamic and Translational Defects. Polymers 2018, 10, 1155 .
AMA StyleYurii V. Grinyaev, Nadezhda V. Chertova, Evgeny V. Shilko, Sergey G. Psakhie. The Continuum Approach to the Description of Semi-Crystalline Polymers Deformation Regimes: The Role of Dynamic and Translational Defects. Polymers. 2018; 10 (10):1155.
Chicago/Turabian StyleYurii V. Grinyaev; Nadezhda V. Chertova; Evgeny V. Shilko; Sergey G. Psakhie. 2018. "The Continuum Approach to the Description of Semi-Crystalline Polymers Deformation Regimes: The Role of Dynamic and Translational Defects." Polymers 10, no. 10: 1155.