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    Damage behavior of filament winding pipes modified with carbon nanotubes under internal pressure
    (GAZI UNIV, 2015) Tasyurek, Mustafa; Tarakcioglu, Necmettin
    In this study, damage behavior of filament winded glass-reinforced plastic (GRP) pipes that reinforcing material mixed in different proportions of under static internal pressure was examined. Multi-walled carbon nanotubes (MWCNT) are used as reinforcing material and the medium-viscosity epoxy are used as matrix material. Free-ended internal pressure test was applied to the experiment. Test specimens were produced with six layered and +/- 55 degrees winding angle. Reinforcement material was added as 0,5% and 1%. In addition, the wall thickness ratio of surface cracks on each kind of sample (w / t) was opened as 0.25 and 0.5 measure. Pure epoxy GRP pipes with same physical characteristics have been used as comparison sample. According to the geometry of the notch surface and different reinforcement ratios burst pressure values were determined and investigated.
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    Enhanced fatigue behavior under internal pressure of CNT reinforced filament wound cracked pipes
    (ELSEVIER SCI LTD, 2017) Tasyurek, Mustafa; Tarakcioglu, Necmettin
    In this study, the fatigue behavior of filament winding pipes was determined experimentally under internal pressure. Samples were produced by ultrasonication and the filament wound methods. In order to produce the CNTs/E Glass/Epoxy nanocomposite, CNTs and E-glass reinforcements and Bisphenol-A epoxy polymer matrix were used. Test specimens had antisymmetric six layers. All specimens had 55 winding angle. During all the experiments, the surface crack, fatigue crack growth rate and reinforcement condition of carbon nanotube were investigated. Two different rates of CNT (0.5% and 1%) were compared with the pure epoxy material. Effect of CNT on fatigue life was investigated experimentally. Cracks on the pipes for the fatigue tests had the aspect ratio of a/c = 0.2 and crack depth range between a/t = 0,25 and 0,50. Each test was repeated at least 3 times. Three different maximum stress levels were determined for the tests, which were 40%, 50% and 60% of the ultimate hoop stress. Fatigue life of nanocomposite pipes was found to increase with enhanced inter-laminar adhesion via CNTs. Stopping crack progression, bridging mechanism and mechanical interlocking between fibers of CNTs had been justified by SEM images. As a conclusion, material properties of GRP pipes were discussed by determining the effect of the reinforcement of carbon nanotubes. (c) 2017 Elsevier Ltd. All rights reserved.
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    Enhancing Fatigue Life of Filament Winding Laminar and Curved Pipes Containing Carbon Nanotubes, and Their Fatigue Failure
    (SAGE PUBLICATIONS LTD, 2017) Tasyurek, Mustafa; Tarakcioglu, Necmettin
    In this study, the fatigue life of glass fibre-epoxy matrix material produced by the filament winding composite pipes and matrix material reinforced with multi-walled carbon nanotubes (MWCNTs) nanocomposite filament winding tubes were studied experimentally under the influence of internal pressure. Glass-reinforced plastic (GRP) pipes which were reinforced with carbon nanotubes were tested in the conditions of an open-ended test. The winding angle of test specimens was +/- 55 degrees and they had six layers. During all the experiments, the fatigue life effect of reinforced carbon nanotubes was investigated. Unreinforced glass, as a reference material, was compared with reinforced plastic with the addition of nano-reinforced material using two different rates of 0.5% and 1%. Fatigue tests of specimens have been carried out in accordance with ASTM D-2992. Later on, the results obtained by determining the material properties with the reinforcement of carbon nanotubes GRP pipes were evaluated. As a result of this study, it has been found that MWCNTs reinforcement increases the fatigue life of the GRP tubes. Inter-laminar fracture strength was developed via the mechanical locking of MWCNTs. The critical MWCNTs usage value was between 0.5% and 1%.