正六边形玻璃纤维增强复合材料多胞结构准静态压缩试验研究

Experimental Study on Quasi⁃static Compression of Multi⁃cell Structure of Hexagon Glass Fiber Reinforced Composites

本工作以正六边形玻璃纤维增强复合材料多胞结构为研究对象,对两种壁厚的正六边形玻璃纤维多胞结构管进行准静态压缩试验,分析了多胞结构管的失效模式和吸能特性。结果表明:在准静态压缩过程中,多胞结构及单胞管均表现为渐进破坏模式,单胞管在壁厚中间产生层间裂纹,裂纹不断扩展使胞元各边产生分层现象,外层向外卷曲扩展,内层向内卷曲扩展且相互挤压形成块状碎屑堆积在管孔,多胞结构管非粘接面在胞元壁厚中间分层,粘接面发生不同程度的脱粘开裂,并向粘接面两侧卷曲,粘接面的相邻面分层后,外层在向外卷曲扩展并相互挤压而发生一定角度的扭曲;多胞结构胞元数量和胞元壁厚对试件的压缩性能和吸能特性有显著影响,不同厚度的多胞结构在压缩过程中,几种多胞结构的实际平均载荷相比相对平均载荷提高了35.7%~77.5%;多胞结构的比吸能和胞元壁厚呈正相关,与胞元数量无明显相关性,本试验最小比吸能为42.5 J/g,最大比吸能为70.9 J/g。

In this paper,the multi⁃cell structure of the regular hexagonal glass fiber reinforced composite material was used as the research object.The quasi⁃static compression test was carried out on the regular hexagonal glass fiber multi⁃cell structure tube with two wall thicknesses,and the failure mode and energy absorption of the multi⁃cell structure tube were analyzed.The results show that during the quasi⁃static compression process,both the multi⁃cell structure and thesingle cell tube show a progressive failure mode.The single cell tube produces interlayer cracks in the middle of the wall thickness.The outer layer curls and expands outward,and the inner layer curls and expands inward and squeezes each other to form blocky debris that accumulates in the tube hole.The non⁃adhesive surface of the multicellular structure tube is layered in the middle of the cell wall thickness,and the bonding surface has different degrees of debonding,and curling to both sides of the bonding surface.After the adjacent surfaces of the bonding surface are layered,the outer layer curls and expands outwards and squeezes each other to twist at a certain angle;the number of cells in the multicellular structure and the cell wall thickness have a significant effect on the compression performance and energy absorption characteristics of the specimen.During the compression process of multi⁃cell structures with different thicknesses,the actual average load of several multi⁃cell structures increases by 35.7%to 77.5%compared with the relative average load;the specific energy absorption of the multicellular structure is positively correlated with the cell wall thickness,and has no obvious correlation with the number of cells.In this experiment,the minimum specific energy absorption is 42.5 J/g,and the maximum specific energy absorption is 70.9 J/g.