Browsing by Author "Beskopylny, A.N."

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Citation - WoS: 9
Citation - Scopus: 9
Crashworthiness Performance of Filament Wound Gfrp Composite Pipes Depending on Winding Angle and Number of Layers
(Elsevier Ltd, 2024) Hakeem, I.Y.; Özkiliç, Y.O.; Bahrami, A.; Aksoylu, C.; Madenci, E.; Asyraf, M.R.M.; Beskopylny, A.N.
The main goal of this study is to enhance the crashworthiness performance of tubular composites to absorb more energy by optimizing the winding angle of their fibers. The crashworthiness performance of glass fiber-reinforced polymer composite pipes manufactured using the filament winding is investigated in detail. The effects of the winding angle of the fibers and thickness of the tube wall on the energy absorption were examined through quasi-static compression tests. The composite pipes were produced with 1200 tex E-glass fibers and Epikote 828 resin as the matrix material. The winding angles of ± 30°, ± 45°, ± 55°, ± 75°, and ± 90° were evaluated, and the number of the winding layers, ranged from 1 to 3, was also assessed. Quasi-static axial compressive loading was applied to 15 specimens using a hydraulic actuator. The results revealed that the one-layer specimens experienced buckling damage at low load levels, while an increase in the number of the layers led to higher load-carrying capacity and different types of damages. Furthermore, as the number of the layers increased, the load-carrying capacity and energy absorption of the specimens significantly improved. Progressive failure was observed in the specimens [± 90] for all the layers' configurations, with the specimen [± 90]3, having three layers, exhibiting the highest performance in terms of the load-carrying capacity and energy absorption. The failure modes indicated a combination of the fibers' separation, buckling, diagonal shear failure, and crushing in the upper and lower heads. © 2023 The Authors
Citation - WoS: 5
Citation - Scopus: 5
Experimental Investigation and Analytical Verification of Buckling of Functionally Graded Carbon Nanotube-Reinforced Sandwich Beams
(Elsevier Ltd, 2024) Madenci, E.; Özkılıç, Y.O.; Bahrami, A.; Aksoylu, C.; Asyraf, M.R.M.; Hakeem, I.Y.; Beskopylny, A.N.
Carbon nanotube (CNT) reinforcement can lead to a new way to enhance the properties of composites by transforming the reinforcement phases into nanoscale fillers. In this study, the buckling response of functionally graded CNT-reinforced composite (FG-CNTRC) sandwich beams was investigated experimentally and analytically. The top and bottom plates of the sandwich beams were composed of carbon fiber laminated composite layers and hard core. The hard core was made of a pultruded glass fiber-reinforced polymer (GFRP) profile. The layers of FG-CNTRC surfaces were reinforced with different proportions of CNT. The reference sample was made of only a pultruded GFRP profile. In the study, the reference sample and four samples with CNT were tested under compression. The largest buckling load difference between the reference sample and the sample with CNT was 37.7%. The difference between the analytical calculation results and experimental results was obtained with an approximation of 0.49%–4.92%. Finally, the buckling, debonding, interlaminar cracks, and fiber breakage were observed in the samples. © 2024 The Authors
Citation - WoS: 60
Citation - Scopus: 70
Shear Performance of Reinforced Expansive Concrete Beams Utilizing Aluminium Waste
(Elsevier Editora Ltda, 2023) Özkılıç, Y.O.; Karalar, M.; Aksoylu, C.; Beskopylny, A.N.; Stel'makh, S.A.; Shcherban, E.M.; Qaidi, S.
Shear damage is a catastrophic failure in the design of reinforced concrete structural elements. To prevent it, the effect of aluminum wastes on reinforced concrete shear beams was investigated in this study. There is a gap in the scientific field on the expanding concrete with aluminium waste, and no research has been done on the utilizing of aluminum waste to produce expandable concrete. Moreover, there is a gap in expandable concrete usage with aluminum waste reinforcing, which is crucial for engineering applications especially beams, slabs and columns. For this purpose, experimental investigations were performed on a total of 12 Reinforced Concrete Beams (RCB) with different aluminum waste ratio (0, 1, 2 and 3 vol.%) and different shear reinforcement spacing (270, 200 and 160 mm). The depth span ratio was chosen as 1.6, 2.0 and 2.7. RCB was simply supported on the loading frame and subjected to four-points bending. As a result of experimental tests for each sample, the maximum load, stiffness, ductility and energy dissipation capacity were calculated. It was observed that the load capacity of the Al refuse combined RCBs raises as the vacancy of the stirrup reinforcement reductions compared with reference RCBs. Furthermore, it was found that the load capacity of the RCBs reduced as the Al refuse quantity in the concrete mixture was increased from 0% to 3%. However, it was found that the decrease in load capacity for 1 vol.% aluminum waste could be tolerated. For this reason, it can be stated that aluminum waste (AW) in reinforced concrete shear beams will contribute to the beam up to 1%. © 2023 The Authors
Citation - WoS: 4
Citation - Scopus: 5
Structure Formation, Rheology and Properties of Sulfur Concrete Mixtures and Sulfur Concrete Modified With Bitumen and Stone Flour
(Elsevier Ltd, 2024) Beskopylny, A.N.; Stel'makh, S.A.; Shcherban', E.M.; Mailyan, L.R.; Meskhi, B.; Chernil'nik, A.; El'shaeva, D.
The development and improvement of cementless concrete, including by use of various types of refuse, is especially important due to their economic and environmental efficiency. Sulfur as a refuse of the oil and gas industry can act as the production of a binder of a new environmentally friendly building material - sulfur concrete (SC). The purpose of the study was to improve effective designs of SC containing refuse from the oil and gas and stone processing industries, and to analyze their rheological and physical and mechanical appearances. Methods of laboratory testing of SC samples, as well as microscopic analysis of its structure, were applied. SC with the best values of compressive strength (CS) and water occlusion has the following formula according to the content of the main components: sulfur - 20% of the mass; stone flour - 10% of the mass; crushed stone - 40% of the mass; sand - 30% of the mass; bitumen modifying additive - 6% by weight of sulfur. The mobility of these combinations is enhanced by up to 2.2 times by adding a bitumen addition to SC formulations. Compared with the control design, the optimal design of modified SC presented an enhancement in CS up to 105% and a reduction in water occlusion up to 70%. The structure of samples of SC of the optimal design does not have shrinkage cavities and pronounced phase boundaries, in contrast to the SC of the control design. © 2024 The Authors