连续碳纤维增强环氧树脂复合材料圆管多胞结构的准静态压缩响应

Quasi-static Compression Responseof Multicellular Structures with Carbon Fiber Reinforced Epoxy Composite Tubes

由纤维增强复合材料制作而成的多胞结构具有优异的吸能特性,在耗能缓冲领域具有广阔的应用前景。为简化制作工艺,提出将碳纤维增强环氧树脂复合材料圆形管采用环氧树脂胶粘结在一起形成碳纤维增强环氧树脂复合材料圆管多胞结构。通过对多胞结构进行准静态压缩试验,分析其压缩破坏模式和耗能特性。研究结果表明:该多胞结构呈现出渐进压缩破坏,当碳纤维管壁厚大于0.5 mm时会出现胶结面开裂;由于相邻碳纤维管阻碍了纤维束的扩展,导致压缩载荷增大,使多胞结构的实际平均载荷高于理论平均载荷,同时引起实际耗能量高于理论耗能量;与单根碳纤维管相比,多胞结构的比吸能更高,试件的最大比吸能达到82 J/g,比吸能增长比最高达到37.9%。

The multicellular structures made of fiber reinforced composites have excellent energy absorption characteristics,and have a broad application prospect in the field of energy dissipation and buffering.In order to simplify the manufacturing process,carbon fiber reinforced epoxy resin composite(CFRP)circular tubes are bonded together with epoxy resin adhesive to form multicellular structures with CFRP tubes(MSCT).The compression failure mode and energy dissipation characteristics of MSCT are analyzed through quasi-static compression test.The results show that MSCT present progressive compression failure,but the bonding surface will crack when the wall thickness of CFRP tube is greater than 0.5 mm;because the adjacent CFRP tubes hinder the expansion of the fiber bundle,the compression load increases,which makes the actual average load of MSCT higher than the theoretical average load,and causes the actual energy absorption higher than the theoretical energy absorption。Compared with a single CFRP tube,the performance of MSCT is better.The maximum specific energy absorption is 82 J/g,and the increment ratio of maximum specific energy absorption is 37.9%.