Quasi-static compression experimental study on energy absorption characteristics of multicellular structures filled with carbon fiber reinforced epoxy composite tubes
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摘要: 针对现有研究对复合材料多胞结构吸能特性研究的不足,提出了一种由多根小尺寸的单根碳纤维增强环氧树脂复合材料圆管(Single CFRP tube,SCT)填充进大尺寸碳管组成的多胞填充结构(Multicellular filling structure,MFS),并分别对SCT和MFS进行了单次全行程加载和多次分段加载的准静态压缩,分析了其压缩破坏模式和吸能特性。研究结果表明:MFS最外侧碳管破坏模式与SCT破坏形式相似,且单次全行程压缩与多次分段压缩的破坏模式没有明显区别,但MFS最外侧碳管由于内部碳管及碎屑的挤压呈现出明显的径向变形;相对于单次全行程压缩过程,SCT及MFS多次分段压缩时的总耗能量更多;本次研究的SCT试件最大比吸能为86.0 J/g,最小比吸能为59.3 J/g,然而由于MFS最外侧管件的比吸能低,导致其比吸能在69.8~75.9 J/g之间,小于单管根碳管的最大比吸能,但进一步研究可知,合适的外部约束形式和内部碳管数量可使MFS比吸能高于SCT的最大比吸能。Abstract: In view of the deficiency of the existing research on the energy absorption characteristics of composite multi-cell structures, a kind of multicellular filling structure (MFS) was proposed, which was filled by some single small-size CFRP tubes (SCT) into large-size CFRP tubes. The quasi-static compression tests of SCT and MFS were carried out, which included full stroke compression and multi-staged compression, then the failure mode and energy absorption characteristics were analyzed. The results show that the failure mode of the outermost CFRP tube of MFS is similar to SCTs, and there is no obvious difference between full stroke compression and multi-staged compression, but the radial deformation of the outermost tube is obvious due to the compression of the inner tube and debris. Compared with the full stroke compression process, the total energy absorption of SCT and MFS is more when they are multi-staged compressed. In this study, the maximum specific energy absorption (SEA) of SCT is 86.0 J/g and the minimum SEA is 59.3 J/g. While, due to the low SEA of the outermost tube of filled structures, the SEA of the MFS is between 69.8 J/g and 75.9 J/g, which is less than the maximum SEA of SCT. The SEA of the MFS is higher than that of SCT with appropriate external constraint and internal carbon tube number by further research.
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Key words:
- CFRP /
- axial compression /
- composite /
- energy absorption /
- failure mode
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表 1 试件尺寸、质量及组成
Table 1. Dimension、mass and constitute of specimens
Specimen number Do/mm Di/mm H/mm M/g Constitute SCT1 18.5 16.7 40 3.58 - SCT2 20.7 18.8 40 4.24 - SCT3 23.2 21 40 5.50 - SCT4 25 23 40 5.43 - SCT5 52 50 40 11.54 - MFS1 52 - 40 22.39 1 SCT5+2 SCT4 MFS2 52 - 40 28.03 1 SCT5+3 SCT3 MFS3 52 - 40 28.51 1 SCT5+4 SCT2 MFS4 52 - 40 29.45 1 SCT5+5 SCT1 Notes:Do—Outer diameter; Di—Inner diameter; H—Height; M—Mass. 表 2 SCT试件的单次全行程准静态压缩过程及破坏模式
Table 2. Quasi-static full stoke compression process and failure modes of SCT specimens
Specimen number Full stoke compression progress Failure mode after compression progress Front side Reverse side SCT1 SCT2 SCT3 SCT4 SCT5 表 3 MFS试件的单次全行程准静态压缩过程及破坏模式
Table 3. Quasi-static full stroke compression process and failure modes of MFS specimens
Specimen number Full stroke compression progress Failure mode after compression progress Front side Reverse side MFS1 MFS2 MFS3 MFS4 -
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