Browsing by Author "Madenci, E."

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Corrigendum To “Experimental Investigation and Analytical Verification of Buckling of Functionally Graded Carbon Nanotube-Reinforced Sandwich Beams” [Heliyon Volume 10, Issue 8, April 2024, Article E28388](s2405844024044190)(10.1016/J.heliyon.2024.e28388)
(Elsevier Ltd, 2025) Madenci, E.; Özkılıç, Y.O.; Bahrami, A.; Aksoylu, C.; Asyraf, M.R.M.; Hakeem, I.Y.; Fayed, S.
In this article, reference [52] was included in error: [52] E. Payton, J. Khubchandani, A. Thompson, J.H. Price, Parents’ expectations of high schools in firearm violence prevention, J. Community Health 42 (2017) 1118–1126. The correct version of the reference is as below: [52] Senjanović, I., Vladimir, N., Hadžić, N., & Tomić, M. (2016). New first order shear deformation beam theory with in-plane shear influence. Engineering Structures, 110, 169-183. https://doi.org/10.1016/j.engstruct.2015.11.032 The authors apologize for the error. © 2025
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 - Scopus: 24
Effect of the Gfrp Wrapping on the Shear and Bending Behavior of Rc Beams With Gfrp Encasement [2]
(Techno-Press, 2022) Özkılıç, Y.O.; Gemi, L.; Madenci, E.; Aksoylu, C.; Kalkan, İ.
The need for establishing the contribution of pultruded FRP encasements and additional FRP wraps around these encasements to the shear strength and load-deflection behavior of reinforced concrete beams is the main motivation of the present study. This paper primarily focuses on the effect of additional wrapping around the composite beam on the flexural and shear behavior of the pultruded GFRP (Glass Fiber Reinforced Polymer) beams infilled with reinforced concrete, taking into account different types of failure according to av/H ratio (arch action, shear-tension, shear-compression and pure bending). For this purpose, nine hybrid beams with variable shear span-to-depth ratio (av/H) were tested. Hybrid beams with 500 mm, 1000 mm, and 1500 mm lengths and cross-sections of 150x100 mm and 100x100 mm were tested under three-point and four-point loading. Based on the testing load-displacement relationship, ductility ratio, energy dissipation capacity of the beams were evaluated with comprehensive macro damage analysis on pultruded GFRP profile and GFRP wrapping. The GFRP wraps were established to have a major contribution to the composite beam ductility (90-125%) and strength (40-75%) in all ranges of beam behavior (shear-dominated or dominated by the coupling of shear and flexure). The composite beams with wraps were showns to reach ductilities and strength values of their counterparts with much greater beam depth. Copyright © 2022 Techno-Press, Ltd.
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