Burst Tests of Filament-wound Graphite-epoxy Tubes

摘要

A tst program was conduted to investigate the failure modes of undamaged and damaged graphite-epoxy cylindrical tubes subjected to internal pressure Some tubes were intentionally damaged gy either a longitudinal-line cut or a single-point impact Hoth types of damage were itended to simulated fiber breakage caused by a loxal damage The objectives of hte program were to investigate the failure modes of graphite-epoxy cylindrical tubes subjected to internal pressure with and without local damage and to qualitatively determine the relative burst pressure adegradatin associated with preexisting local damage to the tubes.A high-speed motion analyzer was used to recore images of the fractures The images provide the failure mode information that was not available in existing literature Testing was conducted under three conditions:hydraulic pressurization pneumatic pressurization with solid insterts and pneumatic pressurization with inertpropellant inserts A tube with a longitudinal cut can fail by three different modes a local leakage mode a bursting mode with fracture initiating from the cut or a bursting mode with complete tube disintegration In testing of impact-damaged tubes the results show that the burst pressure decreases with increasing impact load At an impact load of 1493N (335lb) the burst pressure decreases by 33% compared to the undamaged condition.