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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 Effect of seawater on pin-loaded laminated composites(De Gruyter, 2018-01) Deniz, Mehmet Emin; Karakuzu, Ramazan; Kanlıoğlu, HalitThe aim of this study was to investigate the effect of seawater on bearing strength of glass-epoxy laminated composites. The ratio of the edge distance to pin diameter (E/D) was changed from 1 to 5 and that of the specimen width to pin diameter (W/D) was selected as 3 and 4 for this study. The hole of the specimen was subjected to a traction force induced by a pin. Laminated composite plates were manufactured at the Company Izoreel Composites. Tension tests were performed on pinned joint specimens with a stacking sequence of [0/90]3S. The specimens were immersed in seawater of the Aegean Sea having a salinity of about 3.5 wt.-% in a glass aquarium at laboratory for 1, 3, 6, 9 and 12 months. For each period of immersion time, failure modes and maximum failure loads of the specimens were found experimentally. The maximum reduction of the bearing strength was obtained as 38% for E/D = 3 and W/D = 3 due to the seawater effect.Öğe Effects of specimen dimensions and impact energy on energy absorption and damage of glass/epoxy composite plates(De Gruyter, 2019-02-21) Deniz, Mehmet Emin; Karakuzu, Ramazan; Algan, BerkIn this study, the impact response of laminated composite plates of various specimen dimensions under various impact energies has been investigated, experimentally and numerically. Glass/epoxy composites with [02/902/02/902]s orientations were manufactured by the hand lay-up technique. Low velocity impact tests were conducted using a CEAST-Fractovis Plus impact test machine for specimens with net impact areas; SQR76 (square with 76 mm edge), SQR150 (square with 150 mm edge) and CIR76 (circle with diameter of 76 mm). Numerical analysis was also carried out via 3DIMPACT transient finite element code including matrix cracking and impact-induced delamination criteria. Absorbed energy and the damage size of specimens were investigated for various impact energies. Delamination areas obtained by finite element were in good agreement with those experimentally obtained up to 50 J of impact energy.Öğe Environmental effects on mechanical properties of glass-epoxy composites(De Gruyter, 2014-05) Deniz, Mehmet Emin; Karakuzu, Ramazan; Kanlıoğlu, HalitThis study presents the effects of seawater and distilled water immersion time periods on mechanical properties of unidirectional glass reinforced epoxy composites. Tension, compression, and shear test specimens exposed to seawater and distilled water were prepared according to ASTM standards. After tests, SEM imaging of fracture surface of specimens was made. Results showed that seawater and distilled water immersion time affects significantly mechanical properties and strength values of glass-epoxy composites.
