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Pultruded Fibre Reinforced Polymer (PFRP) composite profiles now have been utilizedin many Civil and infrastructure applications due to their low density and outstanding mechanical properties. However, different manufacturing techniques have been used to produce these PFRP profiles, and these have an influence on the structural performance of the PFRP profiles. This study investigated the compressive behaviour of the PFRP profiles manufactured using the Winder technology, allowing continuous-wound fibres to reinforce the PFRP profiles transversely. Three different cross-sections and three levels of Length-to-Depth (L/D) ratios have been tested to study the effect of these parameters on the compressive strength of the PFRP profiles. It was observed that continuous-wound fibres led to progressive failure and prevented the splitting failure at corners. Test results showed that rectangular profiles performed structurally better than the square profiles. Moreover, the increase in L/D ratio decreased both stiffness and strength but led to higher displacement buckling capacity. It was observed that the buckling waves were governed by a polynomial function. Finally, the existing models were examined in relation to the experimental results where the general plate theory was valid to present the local buckling behaviour of the tested PFRP profiles.
Omar Alajarmeh; Xuesen Zeng; Thiru Aravinthan; Tristan Shelley; Mohammad Alhawamdeh; Ali Mohammed; Lachlan Nicol; Alexander Vedernikov; Alexander Safonov; Peter Schubel. Compressive behaviour of hollow box pultruded FRP columns with continuous-wound fibres. Thin-Walled Structures 2021, 168, 108300 .
AMA StyleOmar Alajarmeh, Xuesen Zeng, Thiru Aravinthan, Tristan Shelley, Mohammad Alhawamdeh, Ali Mohammed, Lachlan Nicol, Alexander Vedernikov, Alexander Safonov, Peter Schubel. Compressive behaviour of hollow box pultruded FRP columns with continuous-wound fibres. Thin-Walled Structures. 2021; 168 ():108300.
Chicago/Turabian StyleOmar Alajarmeh; Xuesen Zeng; Thiru Aravinthan; Tristan Shelley; Mohammad Alhawamdeh; Ali Mohammed; Lachlan Nicol; Alexander Vedernikov; Alexander Safonov; Peter Schubel. 2021. "Compressive behaviour of hollow box pultruded FRP columns with continuous-wound fibres." Thin-Walled Structures 168, no. : 108300.
This study investigates the shape memory behavior of epoxy-based pultruded flat laminates reinforced with unidirectional glass fibers. To evaluate the shape memory performance of the composite material, a series of tests by bending flat specimens to the shape programming angle has been conducted. The shape fixity and shape recovery ratios for the pultruded composite specimens with 90° fiber orientation constituted 78.4% and 92.6%, respectively, and 13.3% and 91.9%, for specimens with 0° fiber orientation. The results obtained in this study show that the shape fixity and recovery ratios of the composite material are only slightly dependent on the shape programming angle and the number of shape memory cycles (up to 10 cycles). The study also determined the shape fixity and shape recovery ratios for cured resin specimens, which constituted 99.7% and 98.2%, respectively. To lay the foundation for further studies on the simulation and optimization of the pultrusion process, the resin cure kinetics, the thermomechanical and thermophysical properties of the cured resin, and the mechanical characteristics of the pultruded shape memory polymer composite were analyzed.
Roman Korotkov; Alexander Vedernikov; Sergey Gusev; Omar Alajarmeh; Iskander Akhatov; Alexander Safonov. Shape memory behavior of unidirectional pultruded laminate. Composites Part A: Applied Science and Manufacturing 2021, 150, 106609 .
AMA StyleRoman Korotkov, Alexander Vedernikov, Sergey Gusev, Omar Alajarmeh, Iskander Akhatov, Alexander Safonov. Shape memory behavior of unidirectional pultruded laminate. Composites Part A: Applied Science and Manufacturing. 2021; 150 ():106609.
Chicago/Turabian StyleRoman Korotkov; Alexander Vedernikov; Sergey Gusev; Omar Alajarmeh; Iskander Akhatov; Alexander Safonov. 2021. "Shape memory behavior of unidirectional pultruded laminate." Composites Part A: Applied Science and Manufacturing 150, no. : 106609.
Cure-induced deformations are inevitable in pultruded composite profiles due to the peculiarities of the pultrusion process and usually require the use of costly shimming operations at the assembly stage for their compensation. Residual stresses formed at the production and assembly stages impair the mechanical performance of pultruded elements. A numerical technique that would allow the prediction and reduction of cure-induced deformations is essential for the optimization of the pultrusion process. This study is aimed at the development of a numerical model that is able to predict spring-in in pultruded L-shaped profiles. The model was developed in the ABAQUS software suite with user subroutines UMAT, FILM, USDFLD, HETVAL, and UEXPAN. The authors used the 2D approach to describe the thermochemical and mechanical behavior via the modified Cure Hardening Instantaneous Linear Elastic (CHILE) model. The developed model was validated in two experiments conducted with a 6-month interval using glass fiber/vinyl ester resin L-shaped profiles manufactured at pulling speeds of 200, 400, and 600 mm/min. Spring-in predictions obtained with the proposed numerical model fall within the experimental data range. The validated model has allowed authors to establish that the increase in spring-in values observed at higher pulling speeds can be attributed to a higher fraction of uncured material in the composite exiting the die block and the subsequent increase in chemical shrinkage that occurs under unconstrained conditions. This study is the first one to isolate and evaluate the contributions of thermal and chemical shrinkage into spring-in evolution in pultruded profiles. Based on this model, the authors demonstrate the possibility of achieving the same level of spring-in at increased pulling speeds from 200 to 900 mm/min, either by using a post-die cooling tool or by reducing the chemical shrinkage of the resin. The study provides insight into the factors significantly affecting the spring-in, and it analyzes the methods of spring-in reduction that can be used by scholars to minimize the spring-in in the pultrusion process.
Alexander Vedernikov; Alexander Safonov; Fausto Tucci; Pierpaolo Carlone; Iskander Akhatov. Modeling Spring-In of L-Shaped Structural Profiles Pultruded at Different Pulling Speeds. Polymers 2021, 13, 2748 .
AMA StyleAlexander Vedernikov, Alexander Safonov, Fausto Tucci, Pierpaolo Carlone, Iskander Akhatov. Modeling Spring-In of L-Shaped Structural Profiles Pultruded at Different Pulling Speeds. Polymers. 2021; 13 (16):2748.
Chicago/Turabian StyleAlexander Vedernikov; Alexander Safonov; Fausto Tucci; Pierpaolo Carlone; Iskander Akhatov. 2021. "Modeling Spring-In of L-Shaped Structural Profiles Pultruded at Different Pulling Speeds." Polymers 13, no. 16: 2748.
Additive manufacturing erases the distance between design ideas and finished parts. However, designers must use several software tools to use these advantages. Moreover, these tools operate with different representations of geometry. This paper describes the architecture of a new CAD/CAM system that uses only the function representation of the geometry (FRep). It provides all widely used design operations and allows an engineer to employ robust and efficient topology optimization algorithms. The developed CAD/CAM system consists of 3D modeling, simulation, topology optimization, and direct manufacturing modules. We successfully printed designed parts and performed mechanical tests of printed parts. The results of tests show good agreement with simulation data. The system makes it possible to create structures with the desired properties in a fast and flexible way. The proposed approach significantly helps in designing additive manufacturing process and saves time for its users.
Dmitry Popov; Yulia Kuzminova; Evgenii Maltsev; Stanislav Evlashin; Alexander Safonov; Iskander Akhatov; Alexander Pasko. CAD/CAM System for Additive Manufacturing with a Robust and Efficient Topology Optimization Algorithm Based on the Function Representation. Applied Sciences 2021, 11, 7409 .
AMA StyleDmitry Popov, Yulia Kuzminova, Evgenii Maltsev, Stanislav Evlashin, Alexander Safonov, Iskander Akhatov, Alexander Pasko. CAD/CAM System for Additive Manufacturing with a Robust and Efficient Topology Optimization Algorithm Based on the Function Representation. Applied Sciences. 2021; 11 (16):7409.
Chicago/Turabian StyleDmitry Popov; Yulia Kuzminova; Evgenii Maltsev; Stanislav Evlashin; Alexander Safonov; Iskander Akhatov; Alexander Pasko. 2021. "CAD/CAM System for Additive Manufacturing with a Robust and Efficient Topology Optimization Algorithm Based on the Function Representation." Applied Sciences 11, no. 16: 7409.
Pultrusion is a highly efficient composite manufacturing process. To accurately describe pultrusion, an appropriate model of resin cure kinetics is required. In this study, we investigated cure kinetics modeling of a vinyl ester pultrusion resin (Atlac 430) in the presence of aluminum hydroxide (Al(OH)3) and zinc stearate (Zn(C18H35O2)2) as processing additives. Herein, four different resin compositions were studied: neat resin composition, composition with Al(OH)3, composition comprising Zn(C18H35O2)2, and composition containing both Al(OH)3 and Zn(C18H35O2)2. To analyze each composition, we performed differential scanning calorimetry at the heating rates of 5, 7.5, and 10 K/min. To characterize the cure kinetics of Atlac 430, 16 kinetic models were tested, and their performances were compared. The model based on the [Formula: see text]th-order autocatalytic reaction demonstrated the best results, with a 4.5% mean squared error (MSE) between the experimental and predicted data. This study proposes a method to reduce the MSE resulting from the simultaneous melting of Zn(C18H35O2)2. We were able to reduce the MSE by approximately 34%. Numerical simulations conducted at different temperatures and pulling speeds demonstrated a significant influence of resin composition on the pultrusion of a flat laminate profile. Simulation results obtained for the 600 mm long die block at different die temperatures (115, 120, 125, and 130 °C) showed that for a resin with a final degree of cure exceeding 95% at the die exit, the maximum difference between the predicted values of pulling speed for a specified set of compositions may exceed 1.7 times.
Alexander Vedernikov; Yaroslav Nasonov; Roman Korotkov; Sergey Gusev; Iskander Akhatov; Alexander Safonov. Effects of additives on the cure kinetics of vinyl ester pultrusion resins. Journal of Composite Materials 2021, 1 .
AMA StyleAlexander Vedernikov, Yaroslav Nasonov, Roman Korotkov, Sergey Gusev, Iskander Akhatov, Alexander Safonov. Effects of additives on the cure kinetics of vinyl ester pultrusion resins. Journal of Composite Materials. 2021; ():1.
Chicago/Turabian StyleAlexander Vedernikov; Yaroslav Nasonov; Roman Korotkov; Sergey Gusev; Iskander Akhatov; Alexander Safonov. 2021. "Effects of additives on the cure kinetics of vinyl ester pultrusion resins." Journal of Composite Materials , no. : 1.
Pultrusion is one of the most efficient methods of producing polymer composite structures with a constant cross-section. Pultruded profiles are widely used in bridge construction, transportation industry, energy sector, and civil and architectural engineering. However, in spite of the many advantages thermoplastic composites have over the thermoset ones, the thermoplastic pultrusion market demonstrates significantly lower production volumes as compared to those of the thermoset one. Examining the thermoplastic pultrusion processes, raw materials, mechanical properties of thermoplastic composites, process simulation techniques, patents, and applications of thermoplastic pultrusion, this overview aims to analyze the existing gap between thermoset and thermoplastic pultrusions in order to promote the development of the latter one. Therefore, observing thermoplastic pultrusion from a new perspective, we intend to identify current shortcomings and issues, and to propose future research and application directions.
Kirill Minchenkov; Alexander Vedernikov; Alexander Safonov; Iskander Akhatov. Thermoplastic Pultrusion: A Review. Polymers 2021, 13, 180 .
AMA StyleKirill Minchenkov, Alexander Vedernikov, Alexander Safonov, Iskander Akhatov. Thermoplastic Pultrusion: A Review. Polymers. 2021; 13 (2):180.
Chicago/Turabian StyleKirill Minchenkov; Alexander Vedernikov; Alexander Safonov; Iskander Akhatov. 2021. "Thermoplastic Pultrusion: A Review." Polymers 13, no. 2: 180.
3D printing allows the fabrication of ceramic implants, making a personalized approach to patients’ treatment a reality. In this work, we have tested the applicability of the Function Representation (FRep) method for geometric simulation of implants with complex cellular microstructure. For this study, we have built several parametric 3D models of 4 mm diameter cylindrical bone implant specimens of four different types of cellular structure. The 9.5 mm long implants are designed to fill hole defects in the trabecular bone. Specimens of designed ceramic implants were fabricated at a Ceramaker 900 stereolithographic 3D printer, using a commercial 3D Mix alumina (Al2O3) ceramic paste. Then, a single-axis compression test was performed on fabricated specimens. According to the test results, the maximum load for tested specimens constituted from 93.0 to 817.5 N, depending on the size of the unit cell and the thickness of the ribs. This demonstrates the possibility of fabricating implants for a wide range of loads, making the choice of the right structure for each patient much easier.
Alexander Safonov; Evgenii Maltsev; Svyatoslav Chugunov; Andrey Tikhonov; Stepan Konev; Stanislav Evlashin; Dmitry Popov; Alexander Pasko; Iskander Akhatov. Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography. Applied Sciences 2020, 10, 7138 .
AMA StyleAlexander Safonov, Evgenii Maltsev, Svyatoslav Chugunov, Andrey Tikhonov, Stepan Konev, Stanislav Evlashin, Dmitry Popov, Alexander Pasko, Iskander Akhatov. Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography. Applied Sciences. 2020; 10 (20):7138.
Chicago/Turabian StyleAlexander Safonov; Evgenii Maltsev; Svyatoslav Chugunov; Andrey Tikhonov; Stepan Konev; Stanislav Evlashin; Dmitry Popov; Alexander Pasko; Iskander Akhatov. 2020. "Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography." Applied Sciences 10, no. 20: 7138.
Arcades, i.e. lenticular and other specifically shaped hollows controlled by discontinuities, have recently been recognized as a weathering form typical for sandstones, weathered quartzites, granites, or tuffs. They are produced by accelerated weathering and erosion in stress shadows related to the redistribution of gravity-induced stress along planar discontinuities in the rock. These forms occur worldwide in various settings (inland humid, arid, and coastal). The origin of arcades has been demonstrated via physical experiments and supported by a relatively simplistic numerical modeling. However, details on their shaping and the evolution of related forms have not been explained. We performed an advanced numerical modeling to produce various shapes of arcades and rock pillars during the erosion of rock masses dissected by discontinuities. We demonstrate that the erosion model, in which erosion takes place when the maximum principal stress is below a certain critical value, can adequately describe the formation of arcades. In the modeling, we set higher critical values for stresses at discontinuities than in a homogeneous material (representing a rock mass) to represent the higher tendency for disintegration of the discontinuity material, which was weakened by the discontinuity formation processes. By applying various discontinuity geometries and values of critical stresses, we were able to reproduce the formation of various arcade shapes and complex-three-dimensional clusters of arcade cavities with rock pillars. Discontinuities and stress-controlled erosion/weathering are the only necessary conditions for arcade formation.
Alexander Safonov; Michal Filippi; David Mašín; Jiří Bruthans. Numerical modeling of the evolution of arcades and rock pillars. Geomorphology 2020, 365, 107260 .
AMA StyleAlexander Safonov, Michal Filippi, David Mašín, Jiří Bruthans. Numerical modeling of the evolution of arcades and rock pillars. Geomorphology. 2020; 365 ():107260.
Chicago/Turabian StyleAlexander Safonov; Michal Filippi; David Mašín; Jiří Bruthans. 2020. "Numerical modeling of the evolution of arcades and rock pillars." Geomorphology 365, no. : 107260.
Currently, the application of pultruded profiles is increasing owing to their advantages, such as light weight, high strength, improved durability, corrosion resistance, ease of transportation, speed of assembly, and nonmagnetic/nonconductive characteristics. This review analyzes the main application fields of elements produced by pultrusion manufacturing processes: bridges and bridge decks, cooling towers, building elements and complete building systems, marine construction, transportation, and energy systems. Analysis of the scientific literature in relation to the mechanical behavior of pultruded elements is presented as well. Finally, this review outlines the future study possibilities, giving the researchers and practitioners the directions for deeper investigation of specific features and exploration of new ones concerning the mentioned aspects of pultruded fiber-reinforced polymer composites.
Alexander Vedernikov; Alexander Safonov; Fausto Tucci; Pierpaolo Carlone; Iskander Akhatov. Pultruded materials and structures: A review. Journal of Composite Materials 2020, 54, 4081 -4117.
AMA StyleAlexander Vedernikov, Alexander Safonov, Fausto Tucci, Pierpaolo Carlone, Iskander Akhatov. Pultruded materials and structures: A review. Journal of Composite Materials. 2020; 54 (26):4081-4117.
Chicago/Turabian StyleAlexander Vedernikov; Alexander Safonov; Fausto Tucci; Pierpaolo Carlone; Iskander Akhatov. 2020. "Pultruded materials and structures: A review." Journal of Composite Materials 54, no. 26: 4081-4117.
The pultrusion of large-diameter glass fiber reinforced epoxy rods at high pulling speed is often accompanied by the formation of cracks at the surface of a profile, leading to product rejection. In this study, we investigate the causes of crack formation based on numerical simulations of manufacturing process mechanics, including the temperature distribution, degree of polymerization, and residual stresses. Based on the built model, we solve the problem of temperature condition optimization for maximizing pulling speed. The results show that up to 27% increases in pulling speed are possible provided that the following conditions are met: thermal destruction of the material is avoided; a profile is cooled sufficiently quickly before cut-off; a high degree of polymerization is achieved in a final product; and there are no cracks in a profile.
Alexander Safonov; Mikhail Gusev; Anton Saratov; Alexander Konstantinov; Ivan Sergeichev; Stepan Konev; Sergey Gusev; Iskander Akhatov. Modeling of cracking during pultrusion of large-size profiles. Composite Structures 2019, 235, 111801 .
AMA StyleAlexander Safonov, Mikhail Gusev, Anton Saratov, Alexander Konstantinov, Ivan Sergeichev, Stepan Konev, Sergey Gusev, Iskander Akhatov. Modeling of cracking during pultrusion of large-size profiles. Composite Structures. 2019; 235 ():111801.
Chicago/Turabian StyleAlexander Safonov; Mikhail Gusev; Anton Saratov; Alexander Konstantinov; Ivan Sergeichev; Stepan Konev; Sergey Gusev; Iskander Akhatov. 2019. "Modeling of cracking during pultrusion of large-size profiles." Composite Structures 235, no. : 111801.
Ultra-high molecular weight polyethylene (UHMWPE) is a bioinert polymer that is widely used as bulk material in reconstructive surgery for structural replacements of bone and cartilage. Porous UHMWPE can be used for trabecular bone tissue replacement, and it can be used in living cell studies as bioinert 3D substrate permeable to physiological fluids. It is important to develop techniques to govern the morphology of open-cell porous UHMWPE structures (pore size, shape, and connectivity), since this allows control over proliferation and differentiation in living cell populations. We report experimental results on the mechanical behavior of porous open-cell UHMWPE obtained through sacrificial removal (desalination) of hot-molded UHMWPE-NaCl powder mixtures with pore sizes in the range 75 µm to 500 µm. The structures were characterized using SEM and mechanically tested under static compression and dynamic mechanical analysis (DMA), bending, and tensile tests. Apparent elastic modulus and complex modulus were in the range of 1.2 to 2.5 MPa showing a weak dependence on cell size. Densification under compression caused the apparent elastic modulus to increase to 130 MPa.
Alexei I. Salimon; Eugene S. Statnik; Michael Yu. Zadorozhnyy; Fedor S. Senatov; Dmitry D. Zherebtsov; Alexander A. Safonov; Alexander M. Korsunsky. Porous Open-Сell UHMWPE: Experimental Study of Structure and Mechanical Properties. Materials 2019, 12, 2195 .
AMA StyleAlexei I. Salimon, Eugene S. Statnik, Michael Yu. Zadorozhnyy, Fedor S. Senatov, Dmitry D. Zherebtsov, Alexander A. Safonov, Alexander M. Korsunsky. Porous Open-Сell UHMWPE: Experimental Study of Structure and Mechanical Properties. Materials. 2019; 12 (13):2195.
Chicago/Turabian StyleAlexei I. Salimon; Eugene S. Statnik; Michael Yu. Zadorozhnyy; Fedor S. Senatov; Dmitry D. Zherebtsov; Alexander A. Safonov; Alexander M. Korsunsky. 2019. "Porous Open-Сell UHMWPE: Experimental Study of Structure and Mechanical Properties." Materials 12, no. 13: 2195.
Today, rapid progress can be seen in ceramic 3D printing processes and their application to the manufacturing of complex-shaped parts. However, the significant deformation of parts during sintering is a major impediment to the broad introduction of the technology. Hence, the application of mathematical modeling methods to simulate the behavior of a part during sintering has become a valuable tool to finely tune the process parameters. The purpose of this paper is to share the experience acquired in the application of the Skorohod-Olevsky Viscous Sintering (SOVS) model for the simulation of the sintering process of Al2O3 samples manufactured with a stereolithography technology. The SOVS model was implemented in the ABAQUS modeling suite using the subroutine mechanism. The modeling results demonstrate an acceptable convergence with the experimental data in terms of the shrinkage and final density of a material.
Alexander Safonov; Svyatoslav Chugunov; Andrey Tikhonov; Mikhail Gusev; Iskander Akhatov. Numerical simulation of sintering for 3D-printed ceramics via SOVS model. Ceramics International 2019, 45, 19027 -19035.
AMA StyleAlexander Safonov, Svyatoslav Chugunov, Andrey Tikhonov, Mikhail Gusev, Iskander Akhatov. Numerical simulation of sintering for 3D-printed ceramics via SOVS model. Ceramics International. 2019; 45 (15):19027-19035.
Chicago/Turabian StyleAlexander Safonov; Svyatoslav Chugunov; Andrey Tikhonov; Mikhail Gusev; Iskander Akhatov. 2019. "Numerical simulation of sintering for 3D-printed ceramics via SOVS model." Ceramics International 45, no. 15: 19027-19035.
The method to optimize a topology of 3D continuous fiber-reinforced additively manufactured structures is discussed. The proposed method makes it possible to simultaneously search for density distribution and local reinforcement layup in 3D composite structures of transversely isotropic materials. The approach uses a dynamical systems method to find density distribution, combined with the method for rotation of reinforcement direction to align it in the direction of principal stresses with local minimum compliance. The algorithm is implemented as a built-in material model within Abaqus finite element suite. Both the optimal material density distribution and the distribution of fiber orientation vector are determined for three structural elements used as benchmarks: the bending of simply supported 2D beam under central point load, the loading of 3D cube by vertical load, and the bending of 3D cantilever beam.
Alexander A. Safonov. 3D topology optimization of continuous fiber-reinforced structures via natural evolution method. Composite Structures 2019, 215, 289 -297.
AMA StyleAlexander A. Safonov. 3D topology optimization of continuous fiber-reinforced structures via natural evolution method. Composite Structures. 2019; 215 ():289-297.
Chicago/Turabian StyleAlexander A. Safonov. 2019. "3D topology optimization of continuous fiber-reinforced structures via natural evolution method." Composite Structures 215, no. : 289-297.
Path planning is a classic and important problem in computer science, with manifold applications in transport optimisation, delivery scheduling, interactive visualisation and robotic trajectory planning. The task has been the subject of classical, heuristic and bio-inspired solutions to the problem. Path planning can be performed in both non-living and living systems. Amongst living organisms which perform path planning, the giant amoeboid single-celled organism slime mould Physarum polycephalum has been shown to possess this ability. The field of slime mould computing has been created in recent decades to exploit the behaviour of this remarkable organism in both classical algorithms and unconventional computing schemes. In this chapter we give an overview of two recent approaches to slime mould inspired computing. The first utilises emergent behaviour in a multi-agent population, behaving in both non-coupled and coupled modes which correspond to slime mould foraging and adaptation respectively. The second method is the structural approach which employs numerical solutions to volumetric topological optimisation. Although both methods exploit physical processes, they are generated and governed using very different techniques. Despite these differences we find that both approaches successfully exhibit path planning functionality. We demonstrate novel properties found in each approach which suggest that these methods are complementary and may be applicable to application domains which require structural and mechanical adaptation to changing environments.
Jeff Jones; Alexander Safonov. Slime Mould Inspired Models for Path Planning: Collective and Structural Approaches. Real-life Applications with Membrane Computing 2018, 293 -327.
AMA StyleJeff Jones, Alexander Safonov. Slime Mould Inspired Models for Path Planning: Collective and Structural Approaches. Real-life Applications with Membrane Computing. 2018; ():293-327.
Chicago/Turabian StyleJeff Jones; Alexander Safonov. 2018. "Slime Mould Inspired Models for Path Planning: Collective and Structural Approaches." Real-life Applications with Membrane Computing , no. : 293-327.
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Igor Ostanin; Alexander Safonov; Ivan Oseledets. Author Correction: Natural Erosion of Sandstone as Shape Optimisation. Scientific Reports 2018, 8, 6232 .
AMA StyleIgor Ostanin, Alexander Safonov, Ivan Oseledets. Author Correction: Natural Erosion of Sandstone as Shape Optimisation. Scientific Reports. 2018; 8 (1):6232.
Chicago/Turabian StyleIgor Ostanin; Alexander Safonov; Ivan Oseledets. 2018. "Author Correction: Natural Erosion of Sandstone as Shape Optimisation." Scientific Reports 8, no. 1: 6232.
This chapter examines the thermal and electrical properties of alumina (Al2O3) coating produced via atmospheric plasma spraying (APS). The electrical properties were measured using the pseudo two-contact impedance spectroscopy method that allowed separating the electrical resistivity of splats and their boundaries within coating microstructure in an experiment. Due to the high velocity of accelerated particles, they can make a strong bonding with substrate upon impact. The deposition process results in the development of layered microstructure within coatings, which consist of splats, splat boundaries, un-melted particles, porosity, voids, and cracks. Micro-hardness was also measured at the cross section of coated samples. Standard metallographic gridding and polishing technique was used to prepare the cross-sectional surface for the microstructural observation. The stationary condition was assumed with the heat flux flowing from top to down for the simulation purposes.
F. Azarmi; E. Mironov; I. Shakhova; Alexander Safonov. Effect of Microstructural Characteristics on Thermal and Electrical Properties of Thermally Sprayed Ceramic Coatings. 77th Conference on Glass Problems 2018, 113 -123.
AMA StyleF. Azarmi, E. Mironov, I. Shakhova, Alexander Safonov. Effect of Microstructural Characteristics on Thermal and Electrical Properties of Thermally Sprayed Ceramic Coatings. 77th Conference on Glass Problems. 2018; ():113-123.
Chicago/Turabian StyleF. Azarmi; E. Mironov; I. Shakhova; Alexander Safonov. 2018. "Effect of Microstructural Characteristics on Thermal and Electrical Properties of Thermally Sprayed Ceramic Coatings." 77th Conference on Glass Problems , no. : 113-123.
Alexander Safonov; Andrew Adamatzky. Computing via material topology optimisation. Applied Mathematics and Computation 2018, 318, 109 -120.
AMA StyleAlexander Safonov, Andrew Adamatzky. Computing via material topology optimisation. Applied Mathematics and Computation. 2018; 318 ():109-120.
Chicago/Turabian StyleAlexander Safonov; Andrew Adamatzky. 2018. "Computing via material topology optimisation." Applied Mathematics and Computation 318, no. : 109-120.
Alexander A. Safonov; Pierpaolo Carlone; Iskander Akhatov. Mathematical simulation of pultrusion processes: A review. Composite Structures 2018, 184, 153 -177.
AMA StyleAlexander A. Safonov, Pierpaolo Carlone, Iskander Akhatov. Mathematical simulation of pultrusion processes: A review. Composite Structures. 2018; 184 ():153-177.
Chicago/Turabian StyleAlexander A. Safonov; Pierpaolo Carlone; Iskander Akhatov. 2018. "Mathematical simulation of pultrusion processes: A review." Composite Structures 184, no. : 153-177.
Natural arches, pillars and other exotic sandstone formations have always been attracting attention for their unusual shapes and amazing mechanical balance that leave a strong impression of intelligent design rather than the result of a stochastic process. It has been recently demonstrated that these shapes could have been the result of the negative feedback between stress and erosion that originates in fundamental laws of friction between the rock's constituent particles. Here we present a deeper analysis of this idea and bridge it with the approaches utilized in shape and topology optimisation. It appears that the processes of natural erosion, driven by stochastic surface forces and Mohr-Coulomb law of dry friction, can be viewed within the framework of local optimisation for minimum elastic strain energy. Our hypothesis is confirmed by numerical simulations of the erosion using the topological-shape optimisation model. Our work contributes to a better understanding of stochastic erosion and feasible landscape formations that could be found on Earth and beyond.
Igor Ostanin; Alexander Safonov; Ivan Oseledets. Natural Erosion of Sandstone as Shape Optimisation. Scientific Reports 2017, 7, 17301 .
AMA StyleIgor Ostanin, Alexander Safonov, Ivan Oseledets. Natural Erosion of Sandstone as Shape Optimisation. Scientific Reports. 2017; 7 (1):17301.
Chicago/Turabian StyleIgor Ostanin; Alexander Safonov; Ivan Oseledets. 2017. "Natural Erosion of Sandstone as Shape Optimisation." Scientific Reports 7, no. 1: 17301.
I. Shakhova; E. Mironov; F. Azarmi; A. Safonov. Thermo-electrical properties of the alumina coatings deposited by different thermal spraying technologies. Ceramics International 2017, 43, 15392 -15401.
AMA StyleI. Shakhova, E. Mironov, F. Azarmi, A. Safonov. Thermo-electrical properties of the alumina coatings deposited by different thermal spraying technologies. Ceramics International. 2017; 43 (17):15392-15401.
Chicago/Turabian StyleI. Shakhova; E. Mironov; F. Azarmi; A. Safonov. 2017. "Thermo-electrical properties of the alumina coatings deposited by different thermal spraying technologies." Ceramics International 43, no. 17: 15392-15401.