Seawater effect on behaviors of impact and axial compression-after impact of composite pipes

The aim of this thesis study is to investigate the effect of the seawater on impact behavior and axial compression after impact strength of the composite pipes having four different diameters and approximately 1.75 mm wall thickness. E-Glass/epoxy pipes with [±55o]3 orientation were fabricated using filament winding process.Specimens, dry and immersed in seawater for 3-, 6-, 9-, and 12-month, were subjected to transverse impact having 15J, 20J, and 25J energies, using instrumented Fractovis Plus impact testing machine at the room temperature. Following, variation of contact force versus time, contact force versus deflection, contact force versus seawater immersion time, absorbed energy versus seawater immersion time, maximum deflection versus seawater immersion time, and contact time versus seawater immersion time for above impact energies are driven.Also, the axial compression after impact tests was carried out by using Universal Shimazdu AG-X testing machine and the compressive strength versus seawater immersion time diagrams is driven. Results show that the seawater has significant effects on transverse impact behavior and the compressive strength of the composite pipes.