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Öğe Transverse impact and axial compression behaviors of glass/epoxy pipes subjected to seawater and impact loading(SAGE, 2013-07) Deniz, Mehmet Emin; Karakuzu, Ramazan; İçten, Bülent MuratThis article investigates the effects of seawater and impact loading on the impact behavior and compressive strength of impacted glass/epoxy composite pipes. The specimens were immersed into artificial seawater at laboratory conditions for 3, 6, 9, and 12 months. First, the impact tests were carried out on composite pipes at room temperature, and then, the axial compression tests were performed. The results of immersed samples were compared with that of reference specimens (dry). Seawater effect on the force-deflection behavior and failure mechanism is more than impact energy with increase in pipe diameter, while impact energy effect is more dominant than seawater effect for small diameters of the pipe. Compressive strength generally reduces with increase in seawater immersion time and specimen diameter except for the highest diameter.Öğe Environmental effect on fatigue life of glass–epoxy composite pipes subjected to impact loading(Elsevier, 2013-01) Deniz, Mehmet Emin; Karakuzu, Ramazan; Özen, Mustafa; Özdemir, Okan; İçten, Bülent MuratThe main objective of this experimental study was to investigate the effects of seawater and impact loading on the fatigue life of glass–epoxy composite pipes under cyclic internal pressure. The pipes were produced by filament winding technique. Composite specimens were immersed in seawater for periods of 3, 6, and 9 months. After the impact tests are carried out at three different energy levels (5, 7.5, and 10 J), fatigue tests were conducted on the specimens. It is seen from results that fatigue life changes according to both impact energy and seawater immersion time. Fatigue life of non-impacted specimen is greater than the impacted one. Fatigue life increases in the impacted specimens up to 3 months and reaches generally maximum value. After that it decreases with increase in seawater immersion time. During the fatigue tests, fatigue damage types named perspiration, leakage, and eruption were observed.Öğe Tabakalı kompozit plakların darbe davranışı üzerine deniz suyu etkisinin araştırılması(Batman Üniversitesi, 2017) Karakuzu, Ramazan; Çalık, İsmail Cihan; Deniz, Mehmet EminBu çalışmanın amacı, [0°/30°/60°/90°]s oryantasyonuna sahip cam lifi-epoksi tabakalı kompozit plakların darbe davranışı üzerine deniz suyunun etkisini araştırmaktır. Bu sebeple 100 x 100 mm boyutlarında 2,9 mm kalınlığında 135 adet numune hazırlanmıştır. Numunelerin darbe deneyleri Fractovis Plus darbe test cihazı kullanılarak gerçekleştirilmiştir. Çalışma beş aşamadan oluşmaktadır. Her bir aşamada 27 numune kullanılmıştır. İlk aşamada deniz suyu görmemiş (kuru) numunelerin testi yapılmış daha sonra geri kalan dört aşamada deniz suyunda bekletilmiş numunelerin testleri yapılmıştır. Numunelerin deniz suyunda bekletilme zamanları 1, 3, 6 ve 9 ay olarak seçilmiştir. Darbe testleri, 10 J, 20 J, 30 J enerjilerinde ve 5 kg, 10 kg, 15 kg vurucu kütlerinde gerçekleştirilmiştir. Testlerin sonucunda, absorbe edilen enerji, maksimum çökme miktarları ve hasar alanlarının deniz suyunda bekletilme zamanına bağlı olarak değişimleri grafikler yardımıyla verilmiştir. Elde edilen sonuçlar kompozit plakların darbe davranışı üzerine deniz suyundaki tuzun, darbe enerjisinin ve darbe ucu kütlesnin önemli etkisinin olduğunu göstermiştir.Öğe Failure pressure and impact response of glass-epoxy pipes exposed to seawater(Elsevier, 2013-06-13) Deniz, Mehmet Emin; Özdemir, Okan; Özen, Mustafa; Karakuzu, RamazanIn this paper, the effect of seawater on failure pressure and impact behaviors of polymer-matrix composites (PMCs) was investigated, experimentally. E-glass fiber and epoxy resin-based composite pipes consist of six layers with ±55 winding angle. The composite pipes were manufactured using filament winding technique. Test samples, dry and immersed in artificial seawater having salinity about 3.5% during 3, 6 and 9 months (according to ASTM D1141) in laboratory, were subjected to static pressure tests before and after impact test. Tests were carried out to determine reduction in failure pressure at room temperature. The test results were compared with those of non-impacted and dry condition samples to study the variation of the residual failure pressures at different impact energies and environmental cases. Results show that the seawater and transverse impact have significant effects on the failure pressures of the composite pipes.
