Stiffness and strength of filament-wound fiber-reinforced composite pipes under internal pressure

This paper describes the results of analytical and experimental studies on the rigidity and strength of filament-wound (FW) fiber-reinforced composite pipes under internal pressure. The stiffness, deformation and strength of FW pipes wound at 30°, 45°, 55° and 70°, as well as those of a FW sandwich pipe wound at 55°, were investigated. The experimental strain and displacement for FW pipes wound at 45° and 55° coincided well with the theoretical ones. The experimental strain for FW sandwich pipes was more conservative than the theoretical one. Based on a maximum stress failure criterion, we present a theoretical approach to the prediction of failure strength under internal pressure. Experimental pressure at failure was compared with theoretical loads, and there was a good correlation between the theoretical and experimental results.