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    The fatigue behavior of (+/- 55 degrees)(3) filament wound GRP pipes with a surface crack under internal pressure
    (ELSEVIER SCI LTD, 2007) Tarakcioğlu, Necmettin; Samancı, A.; Arıkan, Hüseyin; Akdemir, Ahmet
    In this study, the fatigue behavior of (+/- 55 degrees)(3) filament wound composite pipes with a surface crack under alternating internal pressure has been investigated. Glass reinforced plastic (GRP) pipes were made of E-glass/epoxy and tested in an open-ended condition. For this study, a PLC controlled hydraulic test stand has been established. Test specimens have antisymmetric six layers which have +/- 55 degrees winding angles. Fatigue tests of the pipes with a surface crack which have notch aspect ratio a/c = 0.2 and notch-to-thickness ratios a/t = 0.25, 0.38 and 0.50 in the axial direction have been carried out in accordance with ASTM D-2992. This standard allows a frequency of 25 cycles per minute and an R = 0.05 stress ratio. Tests have been performed at three different maximum stress levels, which were 50%, 40% and 30% of the ultimate hoop stress. Final failure of the GRP pipes has been examined and fatigue test results are presented by means of (S-N) curves and delamination damage zone area-cycle (A-N) curves. (C) 2006 Elsevier Ltd. All rights reserved.
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    Fatigue failure analysis of surface-cracked (+/- 45 degrees)(3) filament-wound GRP pipes under internal pressure
    (SAGE PUBLICATIONS LTD, 2012) Samancı, Ahmet; Tarakcioğlu, Necmettin; Akdemir, Ahmet
    In this study, the fatigue behavior of (+/- 45 degrees)(3) filament-wound composite pipes with a surface crack under alternating internal pressure was investigated. Glass-reinforced plastic (GRP) pipes were made of E-glass/epoxy and tested in the open-ended condition. The pipes had a surface crack with a notch-aspect ratio of a/t = 0.2 and notch-to-thickness ratios of a/t = 0.25, 0.38, or 0.50 in the axial direction. Tests were carried out in accordance with ASTM D2992. This standard offers 25 cycles/min and a load ratio of R = 0.05. Tests were performed at three different load levels: 50%, 40%, and 30% of ultimate hoop stress. Whitening, leakage, and final failure of GRP pipes were observed, and fatigue test results were presented by means of S-N curves.