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  • 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 Murat
    The 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
    Failure pressure and impact response of glass-epoxy pipes exposed to seawater
    (Elsevier, 2013-06-13) Deniz, Mehmet Emin; Özdemir, Okan; Özen, Mustafa; Karakuzu, Ramazan
    In 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.