摘要 : Flexible secondary barrier (FSB), a glass woven fabric-reinforced composite, is used for liquefied natural gas (LNG) cargo containment system (CCS) owing to its excellent mechanical and thermal properties. FSB, a sealing material ... 展开 Flexible secondary barrier (FSB), a glass woven fabric-reinforced composite, is used for liquefied natural gas (LNG) cargo containment system (CCS) owing to its excellent mechanical and thermal properties. FSB, a sealing material that prevents LNG leakage, is crucial for preventing accidents among composite materials constituting CCS. However, despite its importance, previous studies highlighting the vulnerability of FSB have been reported, and there is a lack of studies addressing improvements carried out on FSB. In this study, aramid fibers, which have higher strength and modulus than glass fibers, were reinforced on both sides of FSB to improve the mechanical properties. To evaluate the mechanical properties of FSB reinforced by aramid fibers, tensile tests were performed from room temperature (20 degrees C) to cryogenic temperature (-170 degrees C). The thermal properties were also investigated to analyze the effects of aramid fibers on the temperature-dependent behavior of FSB. It was found that the mechanical properties significantly improved due to the reinforcement of aramid fibers. In the case of room temperature, the ultimate strength increased by 72.5% and the elastic modulus increased by 34.9%; with cryogenic temperature, the ultimate strength and elastic modulus increased by 22.5% and 104.1%, respectively. The failure behavior analysis was performed and macroscopic fracture observations were conducted to analyze the effect of temperature on the failure characteristics of the functional composite. The failure characteristics of FSB reinforced by aramid fibers were verified to be temperature-dependent by confirming that the failure mechanism was different according to the temperature. 收起