复合材料双向波纹夹层结构力学性能

周磊; 姚凯; 李会民; 陈明继; 方岱宁

doi:10.13801/j.cnki.fhclxb.20210126.001

复合材料双向波纹夹层结构力学性能

doi: 10.13801/j.cnki.fhclxb.20210126.001

周磊^{1, 2,},
姚凯^3,,
李会民^{1, 2, ,},
陈明继^{1, 2,},
方岱宁^{1, 2,}

1.
北京理工大学　先进结构技术研究院，北京 100081
2.
北京理工大学　轻量化多功能复合材料与结构北京市重点实验室，北京 100081
3.
北京交通大学　土木建筑工程学院，北京 100081

基金项目: 国家自然科学基金(11602020；12072029)；国防基础研究计划(JCKY2019602D024)

详细信息

通讯作者:
李会民，博士研究生，副教授，研究方向为轻量化复合材料结构设计与工艺制造　 E-mail：lhm@bit.edu.cn

中图分类号: TB33
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出版历程
- 收稿日期: 2020-12-02
- 录用日期: 2021-01-13
- 网络出版日期: 2021-01-26
- 刊出日期: 2021-11-01

Mechanical properties of composite bi-directional corrugated sandwich structure

ZHOU Lei^{1, 2
,},
YAO Kai^3
,,
LI Huimin^{1, 2
, ,},
CHEN Mingji^{1, 2
,},
FANG Daining^{1, 2
,}

1.
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
2.
Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, China
3.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100081, China

摘要

摘要: 为改进传统单向波纹夹层结构横向力学性能较差的缺点，设计了一种新型复合材料双向波纹夹层结构。考虑复合材料双向夹层结构制备困难，研究了整套真空辅助成型工艺(VARI)工艺制备方案，实现双向波纹夹层结构的高效制备，以满足工程应用的需要。对制备出的复合材料双向波纹夹层结构与单向波纹夹层结构分别进行面外压缩、弯曲和剪切实验，分析了双向波纹夹层结构在不同载荷下的破坏模式及其失效机制，计算了该结构在不同荷载条件下的强度和模量，并将其与单向波纹夹层结构进行对比分析。结果表明，在压缩荷载作用下，玻璃纤维/环氧树脂芯子为主要承载部分，结构的失效主要体现在芯子的屈曲、断裂和分层；在弯曲荷载的作用下，由于纤维的抗压强度远小于抗拉强度，所以压头下方的上面板最先达到破坏荷载，结构的弯曲失效形式主要为上面板的断裂和脱粘；结构的剪切失效主要以泡沫与面板的脱粘和压溃为主，芯子和面板未见明显的破坏现象；与单向波纹夹层结构相比，双向波纹夹层结构力学性能显著提升。
- 复合材料双向波纹夹层结构 /
- 制备工艺 /
- 压缩 /
- 弯曲 /
- 剪切 /
- 力学性能
Abstract: To improve the transverse mechanical heterogeneity of conventional uni-directional corrugated sandwich structures, a new type of bi-directional composite corrugated sandwich structure was designed. Considering the difficulty of manufacturing the bi-directional corrugated sandwich structure, a procese based on vacuum assistant resin infusion (VARI) was proposed for high efficiency and quality preparation. The prepared structures were subjected to compression, bending and shear tests. The failure modes and mechanism of the bi-directional composite sandwich structures were analyzed, the strength and modulus of the structure under different load conditions were obtained, and the comparison between the bi-directional and uni-directional corrugated sandwich structure was made. The results show that the glass fiber/epoxy resin core is the main bearing part under the compression load, and the failure of the structure is mainly reflected in the buckling, fracture and delamination of the core. Under the bending load, caused by the lower compressive strength than its tensile strength of fiber, the upper panel first reaches the failure load under the pressure head. The bending failure modes of the structure are mainly the fracture and debonding of upper panel. The shear failure of the structure is mainly caused by the debonding of the foam and the panel and the collapse of the foam, but the core and the panel are not obviously destroyed. Compared with uni-directional corrugated sandwich structure, the mechanical properties of bi-directional corrugated sandwich structure are significantly improved.
- composite bi-directional corrugated sandwich structure /
- preparation process /
- compression /
- bending /
- shear /
- mechanical properties

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图 1 复合材料双向波纹夹层结构示意图

Figure 1. Schematic diagram of the bi-directional corrugated sandwich structure of composites

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图 2 复合材料双向波纹夹层结构制备过程图

Figure 2. Preparation process diagram of composite bi-directional corrugated sandwich structure

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图 3 压缩实验示意图

Figure 3. Schematic diagram of the compression experiment

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图 4 弯曲实验示意图

Figure 4. Schematic diagram of the bending experiment

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图 5 剪切实验示意图

Figure 5. Schematic diagram of the shear test

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图 6 复合材料单向和双向波纹夹层结构压缩载荷下力-位移曲线

Figure 6. Force-displacement curves of composite uni-directional and bi-directional corrugated sandwich structure under compression load

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图 7 复合材料双向波纹夹层结构压缩破坏过程

Figure 7. Compression failure process of composite bi-directional corrugated sandwich structure

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图 8 复合材料双向波纹夹层结构压缩性能破坏图

Figure 8. Compression failure diagrams of composite bi-directional corrugated sandwich structure

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图 9 复合材料单向和双向波纹夹层结构弯曲载荷下力-位移曲线

Figure 9. Force-displacement curves of composite uin-directional and bi-directional corrugated sandwich structure under bending load

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图 10 复合材料双向波纹夹层结构弯曲破坏过程图

Figure 10. Bending failure process diagrams of composite bi-directional corrugated sandwich structure

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图 11 复合材料双向波纹夹层结构弯曲性能破坏图

Figure 11. Bending failure diagrams of composite bi-directional corrugated sandwich structure

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图 12 复合材料单、双向波纹夹层结构剪切载荷下力-位移曲线

Figure 12. Force-displacement curves of composite uni-directional and bi-directional corrugated sandwich structure under shear load

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图 13 复合材料双向波纹夹层结构剪切破坏过程图

Figure 13. Shear failure process diagrams of composite bi-directional corrugated sandwich structure

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图 14 复合材料双向波纹夹层结构剪切性能破坏图

Figure 14. Shear failure diagrams of composite bi-directional corrugated sandwich structure

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表 1 制备复合材料双向波纹夹层结构材料的材料属性：(a)碳纤维平纹织物/环氧(CF/EP)复合材料和玻璃纤维平纹织物/环氧(GF/EP)复合材料；(b)聚氯乙烯(PVC)泡沫

Table 1. Properties of the materials used to produce the bi-directional corrugated-core sandwich panels: (a) Carbon fiber/epoxy (CF/EP) and glass fiber/epoxy (GF/EP) composites; (b) Polyvinyl chloride (PVC) foam

(a) Properties of CF/EP and GF/EP composites
Property	E₁₁/GPa	E₂₂/GPa	E₃₃/GPa	G₁₂/GPa	G₁₃,G₂₃/GPa	υ₁₂/GPa	υ₁₃, υ₁₃/GPa	ρ/(kg·m⁻³)
Value(GF/EP)	22	22	8.9	4.4	5.3	0.3	0.45	1800
Value(CF/EP)	72	72	10	4.5	5.6	0.34	0.45	1600
(b) Properties of PVC foam
Property	Density/(kg·m⁻³)			Elasticity modulus/MPa			Poisson's ratio
Value	80			90			0.4
Notes: E₁₁—Longitudinal stiffness; E₂₂—Transverse stiffness; E₃₃—Out-of-plane stiffness; υ₁₂, υ₁₃,υ₂₃—Poisson's ratio; G₁₂, G₁₃,G₂₃—Shear modulus.

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表 2 复合材料单向和双向波纹夹层结构压缩性能

Table 2. Compressive properties of composite uni-directional and bi-directional corrugated sandwich structure

Sample	1	2	3	4	5	Uni-directional
Compression strength/MPa	7.15	10.38	9.72	7.78	9.66	7.83
Compression modulus/MPa	199.43	212.32	218.92	232.35	263.92	135.36

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表 3 复合材料单向和双向波纹夹层结构弯曲性能

Table 3. bending properties of composite uni-directional and bi-directional corrugated sandwich structure

Sample	1	2	3	4	5	Uni-directional
Bending strength/MPa	142.17	152.23	138.74	144.11	142.75	112.59
Bending stiffness/(kN·m²)	1.50	1.56	1.72	1.60	1.65	1.17

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表 4 复合材料单向和双向波纹夹层结构剪切性能

Table 4. Shear properties of composite uni-directional and bi-directional corrugated sandwich structure

Sample	1	2	3	4	5	Uni-directional
Shear strength/MPa	2.77	3.00	2.87	2.82	2.98	2.21
Shear modulus/MPa	50.77	50.28	52.20	51.00	51.8	41.5

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