碳纳米管薄膜层间改性复合材料在不同应变率下的力学性能

李周仪; 胡振彪; 汪浩康; 索涛

doi:10.11858/gywlxb.20180658

碳纳米管薄膜层间改性复合材料在不同应变率下的力学性能

doi: 10.11858/gywlxb.20180658

李周仪^{1, 2, 3,},
胡振彪^{1, 2, 3},
汪浩康^{1, 2, 3},
索涛^{1, 2, 3,*, ,}

1.
西北工业大学航空学院，陕西西安　710072
2.
陕西省冲击动力学及工程应用重点实验室，陕西西安　710072
3.
冲击动力学及其工程应用国际联合研究中心，陕西西安　710072

基金项目: 国家自然科学基金（11772268，11522220，11272267，11527803）

详细信息

作者简介:
李周仪（1993－），女，博士研究生，主要从事冲击动力学研究. E-mail: lizhouyi1993@163.com

通讯作者:
索　涛（1979－），男，博士，教授，主要从事冲击动力学研究. E-mail: suotao@nwpu.edu.cn

中图分类号: O347.3
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出版历程
- 收稿日期: 2018-10-15
- 修回日期: 2018-11-29

Mechanical Properties of CFRP Composites with CNT Film Interlayer under Different Strain Rates

LI Zhouyi^{1, 2, 3
,},
HU Zhenbiao^{1, 2, 3},
WANG Haokang^{1, 2, 3},
SUO Tao^{1, 2, 3,*
, ,}

1.
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
2.
Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application, Xi’an 710072, China
3.
Joint International Research Laboratory of Impact Dynamics and Its Engineering Application, Xi’an 710072, China

摘要

摘要: 将浮动催化化学气相沉积法制备的碳纳米管膜作为碳纤维层间改性材料，采用热压成型工艺制备了碳纳米管膜/碳纤维/环氧树脂混杂复合材料，并对其进行准静态II型断裂韧性实验以及准静态和动态压缩实验。碳纳米管膜层间改性后，复合材料的II型断裂韧性比未改性材料提高约60%，扫描电镜图像显示增韧机理主要是碳纳米管对基体的桥联。压缩实验结果表明，准静态压缩下碳纳米管膜改性材料在面内和面外两个方向的压缩强度都得到一定提高，动态面外压缩时改性后材料的压缩强度提高约9%，但是动态面内压缩时压缩强度没有提高，断口形貌显示这主要是碳纳米管膜内的分层所致。
- 碳纳米管薄膜 /
- 层间改性 /
- 霍普金森压杆 /
- 高应变率
Abstract: Carbon nanotube film prepared by floating catalyst chemical vapor deposition (FCCVD) method was used as interlayer toughening material for carbon fiber reinforced laminated composites. The carbon nanotube film/carbon fiber/epoxy hybrid (CNTF/CF/EP) composites were prepared by hot pressing and cut into two dimensions respectively for compression and type II fracture toughness test. It has been observed that the type II fracture toughness is improved by 60% due to the carbon nanotube interlayers. Scanning electron microscope results suggest that the bridging of matrix cracks by carbon nanotubes leads to a higher type II fracture toughness. The results of compression experiments indicate that the compressive strength in both in-plane and out-of-plane directions is enhanced to some extent under quasi-static compression due to the carbon nanotube interlayers. Moreover, the enhancement in compressive strength which is as high as 9% out-of-plane direction can be achieved under high strain rates after modifying the interlayer structures with carbon nanotubes. However, there is no increase of compressive strength during dynamic compression in in-plane direction, and the fracture morphology shows that the primary reason is due to the internal delamination of the carbon nanotube films.
- carbon nanotube film /
- interlaminar toughening /
- split Hopkinson pressure bar /
- high strain rate

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图 1 热压工艺图

Figure 1. Schematic diagram of hot pressing

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图 2 ENF试样及加载方式

Figure 2. ENF specimen and the proposed loading method

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图 3 层合板铺层和试样在压缩实验中的受载方向

Figure 3. Illustration of interlayered ply sequences and the specimen with two loading directions during the compression tests

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图 4 SHPB装置示意图

Figure 4. Schematic diagram of SHPB

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图 5 典型应力-应变曲线和应变率时程曲线

Figure 5. Typical stress-strain curve and strain rate history

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图 6 CNTF/CF/EP与CF/EP II型断裂试验的载荷-位移曲线

Figure 6. Load-displacement curve for G_IIC tests of CNTF/CF/EP and CF/EP

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图 7 CF/EP和CNTF/CF/EP试样的断口形貌

Figure 7. Fracture graphs of CF/EP and CNTF/CF/EP specimens

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图 8 准静态加载下CF/EP和CNTF/CF/EP的应力-应变曲线

Figure 8. Stress-strain curves of CF/EP and CNTF/CF/EP under static loading

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图 9 2500 s^–1面外压缩下CF/EP和CNTF/CF/EP的应力-应变曲线

Figure 9. Stress-strain curves of CF/EP and CNTF/CF/EP under 2500 s^–1 out-of-plane compression

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图 10 面外压缩下CF/EP和CNTF/CF/EP的破坏过程

Figure 10. Damage of CF/EP and CNTF/CF/EP under out-of-plane compression

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图 11 600 s^–1面内压缩下CF/EP和CNTF/CF/EP的应力-应变曲线

Figure 11. Stress-strain curves of CF/EP and CNTF/CF/EP under 600 s^–1 in-plane compression

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图 12 面内压缩下CF/EP和CNTF/CF/EP的破坏过程

Figure 12. Damage of CF/EP and CNTF/CF/EP under in-plane compression

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图 13 CNTF改性试样破坏后断口的微观图像

Figure 13. Microscope photo of fracture surface of CNTF interlayered specimen after damage

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图 14 不同应变率下面内和面外压缩时CNTF/CF/EP的应力-应变曲线

Figure 14. Stress-strain curves of CNTF/CF/EP under in-plane and out-of-plane compressions at different strain rates

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表 1 整形片尺寸

Table 1. Sizes of pulse shaping slices

$\dot \varepsilon $/s^–1	Size of pulse shaping slice/(mm×mm×mm)
$\dot \varepsilon $/s^–1	CF/EP (In-plane)	CNTF/CF/EP (In-plane）	CF/EP (Out-of-plane）	CNTF/CF/EP (Out-of-plane)
600	6×7×0.8	6×7×0.8
1200	10×10×0.8	10×10×0.8	7×7×1.0	7×7×1.0
2500			5×6×0.8	5×6×0.8

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表 2 CF/EP与CNTF/CF/EP在不同应变率下的压缩强度与消耗能量

Table 2. Compression strength and dissipated energy of CF/EP and CNTF/CF/EP

Specimen	Loading method	Strain rate/s^–1	Compression strength/MPa	Dissipated energy/（N·mm^–2）
CF/EP	Out-of-plane	10^–3	670.8±5	28.024
CF/EP	Out-of-plane	1000	843.3±20	37.943
CF/EP	Out-of-plane	2500	799.5±10	35.724
CNTF/CF/EP	Out-of-plane	10^–3	687.3±4	29.847
CNTF/CF/EP	Out-of-plane	1000	881.1±9	43.347
CNTF/CF/EP	Out-of-plane	2500	847.1±15	40.853
CF/EP	In-plane	10^–3	321.0±5	2.370
CF/EP	In-plane	600	621.4±5	8.681
CF/EP	In-plane	1000	676.3±12	9.140
CNTF/CF/EP	In-plane	10^–3	405.8±6	2.790
CNTF/CF/EP	In-plane	600	699.3±10	8.743
CNTF/CF/EP	In-plane	1000	646.0±16	9.544

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