Failure analysis of (±55°)3 filament wound composite pipes with an inclined surface crack under static internal pressure

This study conducts failure analysis of filament wound glass reinforced plastic (GRP) pipes made of E-glass/epoxy with an inclined surface crack under open-ended internal pressure. Test specimens are composed of six antisymmetric layers with (±55°)3 winding angles. Tests have been performed at seven different crack angles: 0°,15°,30°,60°,45°,75°, and 90°90°, with crack-to-thickness ratio of a/t=0.50a/t=0.50. The burst strengths of the specimens were determined, and the dependence of the burst strength on the crack angle was examined.