{"title":"露水轻木芯夹层结构冲击性能比较研究","authors":"Moslem Najafi, Jafar Eskandari Jam, Reza Ansari","doi":"10.1007/s13726-024-01346-1","DOIUrl":null,"url":null,"abstract":"<div><p>This study aims to examine how moisture absorption affects the impact behavior of a recently developed sandwich structure designed for use as a water-resistant system in the marine industry. For this purpose, two types of balsa-cored sandwich systems were manufactured, one with conventional glass fiber-epoxy (GE) skins and the other with novel fiber metal laminates (FML) skins. Subsequently, the specimens were exposed to environmental aging through distilled water immersion for 100 days before impact testing. Low-velocity impact behavior was studied using Charpy tests, while high-velocity impact tests were conducted with a light gas gun. The experimental results showed that FML sandwich systems exhibited significantly better impact characteristics compared to GE systems. Before aging, the Charpy impact strength and high-velocity impact absorbed energy of FML systems were 187% and 49% higher than those of GE ones. Another main finding was the impact properties of the FML systems showed a lower decline due to moisture aging compared to the GE systems, for both low- and high-velocity impacts. The reduction of Charpy impact strength and high-velocity impact absorbed energy due to moisture aging in GE systems with sealed edges was about 15%, and 3%, respectively, and for sealed edges FML systems was less than 12% and 1%, respectively. The results also indicated that the high-velocity impact properties of both sandwich systems studied were not significantly affected by moisture aging. 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The reduction of Charpy impact strength and high-velocity impact absorbed energy due to moisture aging in GE systems with sealed edges was about 15%, and 3%, respectively, and for sealed edges FML systems was less than 12% and 1%, respectively. The results also indicated that the high-velocity impact properties of both sandwich systems studied were not significantly affected by moisture aging. 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引用次数: 0
摘要
本研究旨在探讨吸湿性如何影响最近开发的夹层结构的冲击行为，该结构设计用作船舶工业的防水系统。为此，我们制造了两种轻木芯夹层系统，一种是传统的玻璃纤维-环氧树脂（GE）表皮，另一种是新型的纤维金属层压板（FML）表皮。随后，在进行冲击测试之前，将试样通过蒸馏水浸泡 100 天进行环境老化。低速冲击行为采用夏比试验进行研究，高速冲击试验则采用光气枪进行。实验结果表明，FML 夹层系统的冲击特性明显优于 GE 系统。老化前，FML 系统的夏比冲击强度和高速冲击吸收能量分别比 GE 系统高出 187% 和 49%。另一个主要发现是，与 GE 系统相比，FML 系统在低速和高速冲击中因受潮老化而导致的冲击特性下降幅度较小。带密封边缘的 GE 系统因湿气老化导致的夏比冲击强度和高速冲击吸收能量下降分别约为 15%和 3%，而带密封边缘的 FML 系统则分别低于 12%和 1%。研究结果还表明，所研究的两种夹层系统的高速冲击特性都没有受到湿气老化的显著影响。总之，研究结果表明，FML 蒙皮可显著增强船用轻木芯夹层结构的抗冲击性和环境耐久性。
A comparative study on the impact performance of water-exposed balsa-cored sandwich structures
This study aims to examine how moisture absorption affects the impact behavior of a recently developed sandwich structure designed for use as a water-resistant system in the marine industry. For this purpose, two types of balsa-cored sandwich systems were manufactured, one with conventional glass fiber-epoxy (GE) skins and the other with novel fiber metal laminates (FML) skins. Subsequently, the specimens were exposed to environmental aging through distilled water immersion for 100 days before impact testing. Low-velocity impact behavior was studied using Charpy tests, while high-velocity impact tests were conducted with a light gas gun. The experimental results showed that FML sandwich systems exhibited significantly better impact characteristics compared to GE systems. Before aging, the Charpy impact strength and high-velocity impact absorbed energy of FML systems were 187% and 49% higher than those of GE ones. Another main finding was the impact properties of the FML systems showed a lower decline due to moisture aging compared to the GE systems, for both low- and high-velocity impacts. The reduction of Charpy impact strength and high-velocity impact absorbed energy due to moisture aging in GE systems with sealed edges was about 15%, and 3%, respectively, and for sealed edges FML systems was less than 12% and 1%, respectively. The results also indicated that the high-velocity impact properties of both sandwich systems studied were not significantly affected by moisture aging. In general, the findings suggest that FML skins significantly enhance both the impact resistance and environmental durability in marine balsa-cored sandwich structures.
期刊介绍：
Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.
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