Damage Behavior of Filament Winding Pipes Modified with Carbon Nanotubes Under Internal Pressure

In this study, damage behavior of filament winded glass-reinforced plastic (GRP) pipes that reinforcing material mixed in different proportions of under static internal pressure was examined. Multi-walled carbon nanotubes (MWCNT) are used as reinforcing material and the medium-viscosity epoxy are used as matrix material. Free-ended internal pressure test was applied to the experiment. Test specimens were produced with six layered and +/- 55 degrees winding angle. Reinforcement material was added as 0,5% and 1%. In addition, the wall thickness ratio of surface cracks on each kind of sample (w / t) was opened as 0.25 and 0.5 measure. Pure epoxy GRP pipes with same physical characteristics have been used as comparison sample. According to the geometry of the notch surface and different reinforcement ratios burst pressure values were determined and investigated.