Improvement of the burst strength of FW-FRP composite pipes after impact using low-modulus amorphous carbon fiber

摘要

Impact tests of filament-wound carbon fiber reinforced plastic (FW-CFRP) composite pipes were carried out using a drop-weight impact test device developed by the authors. Burst pressure of composite pipes after impact tests was also measured in order to investigate the burst strength degradation due to impact damage. Depth of fiber breakage region caused by impact loading was evaluated after burst strength test. The burst strength of FW-CFRP composite pipes after impact was demonstrated to decrease with the increase in cross-sectional area of damage. Furthermore, low-modulus carbon fibers were wound on the surface of the pipes in order to suppress the impact damage. Consequently, it was understood that the residual burst strength was enhanced due to the reduction of impact damage such as fiber breakages. [References: 6]