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Öğe Effects of nanomaterials on the mechanical properties of epoxy hybrid composites(Springer Int Publ Ag, 2020) Erkendirci, Omer Faruk; Avci, AhmetIn this study, the effects of nanoparticles added to a newly developed hybrid composite material are examined. We investigated enhancing mechanical properties of plain weave (PW) carbon and glass fiber fabric/epoxy resin hybrid composite material we had developed by adding nanomaterials into the composition. For this purpose, we selected silica (SiO2) nanoparticles and carbon nanotubes (CNT). The two different nanomaterials are added into epoxy resin (L160) in four different combinations, which are SiO2, CNT + SiO2 and CNT together and none, and in five different thickness, which are laminations of three, five, seven, eleven and fifteen layers. We then tested these four mixtures in five thickness making up twenty combinations in the area of mechanical properties using tension test methods. Results of the tests in stress-strain graphs are shared in detail by displaying the mechanical properties of epoxy hybrid composite materials in tables and load-extension figures. The results and their causes are discussed giving a general conclusion of the nanomaterial enhancement properties of the new hybrid composite.Öğe Experimental Investigation of Tensile and Impact Response of Nano-Alumina-Filled Epoxy Hybrid Composites Reinforced with Carbon-Kevlar and Carbon-Glass Fabrics(Springer Heidelberg, 2022) Erkendirci, Omer Faruk; Avci, Ahmet; Dahil, Lutfiye; Kaya, Kenan; Kilictek, Serkan; Sezgin, AbdullahThe present study investigates tensile strength and impact resistance of alumina (Al2O3) filled carbon-S2-glass (CG) and carbon-Kevlar-49 (CK) reinforced epoxy hybrid composites, for three, five and seven layers. Nanoparticles of 40-nm size are dispersed in the epoxy matrix at a concentration of 2 wt.% of the matrix. Composites are manufactured employing the vacuum-assisted resin transfer molding method. Mechanical properties are determined by tensile and Charpy-V-notch impact tests. It is shown that number of layers affects tensile and impact characteristics. Ultimate tensile stress of CK laminates increases by approximately 35%; however, it decreases for CG laminates by 20%, per addition of a single layer of a particular fiber, whereas a similar trend in elongation at break and tensile modulus is observed for both types of composites. Stress-strain curves follow a particular pattern, characterized by unstable delamination and gradual fragmentation of a single laminae. With the addition of nanoparticles, both modulus of elasticity and ultimate tensile stress are greatly decreased by approximately one and two orders of magnitude. Values of ultimate tensile stress and strain increase with number of layers for CK laminates, while it is the other way around for CG laminates. Charpy impact tests reveal that impact energy and impact strength of the CG laminates are larger than those of the CK laminates; and impact strength increases with number of layers. Micro-scale damage analysis is conducted via scanning electron microscope (SEM) technique. Accordingly, fiber breakage, fiber pull-out and matrix cracks occur in the composites.Öğe Investigation of the penetration behavior of silicon dioxide epoxy hybrid nanocomposites(Sage Publications Ltd, 2021) Erkendirci, Omer Faruk; Cakici, Avni; Avci, Ahmet; Dahil, LutfiyeThe use of nanomaterials is gradually increasing with the progress of nanotechnology. In particular, the production of nanocomposites incorporating nanoparticles is one of the most significant areas in which nanomaterials are being used increasingly. The first objective of this research was to detect the punch shear or penetration resistance behavior and damage mechanisms of hybrid nanocomposites obtained by using silica (SiO2) nanoparticles. For that purpose, six different SiO2 hybrid nanocomposites with different laminations three layer (3La), 5La, 7La, 11La, 15La and 21La and different thicknesses (H-C) of 0.95 similar to 4.98 mm, were made by using vacuum assisted transfer molding (VARTM). During this research, quasi-static punch-shear (QS-PS) tests at span punch ratios (SPRs) of 1.16, 1.33, 1.67, 2.00, 2.33, 2.67, and more were conducted to determine quasi-static penetration mechanics and penetration resistance behavior. Moreover, deflection, energy dissipation, damage area, stiffness, and peak force values were investigated through experimental results and scanning electronic microscope (SEM) images.Öğe Quasi-static impact resistance and damage mechanisms of polymer hybrid nanocomposites(Taylor & Francis Ltd, 2020) Erkendirci, Omer Faruk; Avci, AhmetQuasi-static (QS) punch shear damage of a composite material is an important damage mode during the penetration and perforation of fibre-reinforced composites and also QS punch shear penetration resistance of a composite material shows the energy dissipating capacity of material under transverse loading without dynamic and rate effects. In this paper, a study of QS penetration resistance behaviour of the single-walled carbon nanotubes (CNT) are added into epoxy resin L160 reinforced with plain weave PW Carbon/Glass hybrid nanocomposite materials with varying thicknesses, i.e. 1.18?6.75 mm which are laminated 3 layers (3L), 5L, 7L, 11L, 15L and 21L The penetration resistance is usually shown by a load?displacement graph, integral of which is the energy dissipated by the composite during penetration. Most important objective of this study is to find out relationship of the impact penetration resistance of any layer by using the data obtained from penetration forces, dissipated energies and other values in the different layers with together graphs and functions. Therefore, the effect of CNT and similar properties has not been compared with other hybrid nanocomposites and studies. The damage mechanism of the composite material is explained in detail with stereomicroscope, photograph and SEM images.
