Failure analysis of (+/-55(o))(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(o))(3) winding angles. Tests have been performed at seven different crack angles: 0(o),15(o),30(o),60(o),45(o),75(o), and 90(o), with crack-to-thickness ratio of a/t=0.50. The burst strengths of the specimens were determined, and the dependence of the burst strength on the crack angle was examined.