Preparation process, compression and shear behavior of carbon/carbon honeycomb
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摘要:
为了满足高分辨率航天飞行器对高尺寸稳定性、轻量化和高强度承载平台结构的多重要求，采用热压成型和树脂浸渍碳化组合工艺制备了不同规格的六边形碳/碳(C/C)蜂窝结构。以碳纤维预浸料为原料，通过热压工艺成型波纹片，用无机胶粘剂粘合波纹片材形成C/C蜂窝，经过浸渍-碳化的致密化工艺，试样在高温工艺过程中未发生节点脱粘。对不同规格的蜂窝试样开展了压缩和剪切试验：表征了C/C蜂窝的面外压缩、L向与W向面内剪切性能；对比分析了不同规格的C/C蜂窝的面外压缩行为。研究表明，在不同加载方式下，C/C蜂窝主要失效模式是双层壁脱粘分层。C/C蜂窝具有较高的抗压强度和良好的力学性能，可以满足未来轻质高强航天器承载平台结构的要求。 碳/碳蜂窝制备工艺流程(a)和四种规格边长蜂窝面外压缩强度(b) Abstract: To meet the multiple requirements of dimensional stability, light weight, and high load-bearing capacity for the high resolution spacecraft bearing platform, four different sizes of carbon/carbon (C/C) honeycomb were prepared by the combination of hot pressing and resin impregnation-carbonization processes. Carbon fiber prepreg was used as the raw material to form corrugated sheets by hot pressing, and inorganic adhesive was used to bond the corrugated sheets to form the honeycomb. C/C honeycomb was formed by the impregnation-carbonization process. The mechanical behaviors of different sizes of C/C honeycomb under different load modes were investigated. The results show that the C/C honeycombs prepared by the proposed combined process do not experience nodal debonding, and the compressive strength of the 5 mm edge length honeycomb is 8.2 MPa. The main failure mode of C/C honeycomb is double wall debonding delamination under out-of-plane compression, L and W direction shear process loads. The C/C honeycombs show high compressive strength and good designability and may meet the requirements of future lightweight and high strength spacecraft bearing platforms.-
Key words:
- carbon/carbon honeycomb /
- out-of-plane compression /
- in-plane shear /
- failure mode
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图 2 碳/碳蜂窝几何参数示意图(a)和边长10 mm蜂窝光学照片(b)
Figure 2. Geometric parameters C/C honeycomb core (a) and photograph (b) of honeycomb with 10 mm side length
l—Cell side length of honeycomb core；t—Thickness of the honeycomb single wall；2t—Thickness of the honeycomb double wall；H—Height of the honeycomb core
图 3 不同轮次树脂浸渍碳化过程后碳/碳蜂窝单层壁((a)~(c))和双层壁胶粘区域((d)~(f))的微观形貌SEM图像
Figure 3. SEM images of C/C honeycomb single core ((a)-(c)) and adhesive double wall ((d)-(f)) after different cycles resin impregnation-carbonization process
图 4 10 mm边长碳/碳蜂窝及夹层结构应力-应变曲线(a)与破坏过程：(b)夹层板试样；(c)蜂窝试样
Figure 4. Compression stress-strain curve of C/C honeycomb core and sandwich specimens with l of 10 mm (a) and the failure progress: (b) Sandwich panel specimens; (c) Honeycomb core specimens
图 5 不同边长碳/碳蜂窝面外压缩应力-应变曲线与破坏过程：(a)~(b)15 mm；(c)~(d)10 mm；(e)~(f)7.5 mm；(g)~(h)5 mm
Figure 5. Out-of-plane compression stress-strain curve and failure progress of C/C honeycomb core specimens with different cell side length: (a)-(b) 15 mm; (c)-(d) 10 mm; (e)-(f) 7.5 mm; (g)-(h) 5 mm
图 6 10 mm边长碳/碳蜂窝面内剪切应力-应变曲线(a)与破坏过程：(b)L向剪切；(c)W向剪切
Figure 6. In-plane shear stress-strain curve of 10 mm side length C/C honeycomb core specimens (a) and the failure progress under different loading directions: (b) L shear; (c) W shear
图 7 不同边长碳/碳蜂窝压缩应力-应变曲线
Figure 7. Compressive stress-strain curves for C/C honeycombs with different edge lengths
图 8 不同边长碳/碳蜂窝压缩强度
Figure 8. Compression strength of C/C honeycombs with different side lengths
图 9 碳/碳蜂窝芯子压缩强度与蜂格几何尺寸(t/l)的关系
Figure 9. C/C honeycomb core compression strength versus lattice geometry (t/l)
表 1 不同几何规格蜂窝芯子规格参数
Table 1. Different test specimens of different cell length
l/mm Test item Density
ρ/(g·cm−3)Relative
density ρ*/%15 Compression 0.13 4.6 10 Compression；shear 0.18 6.9 7.5 Compression 0.26 9.2 5 Compression 0.36 13.8 
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表 2 碳/碳蜂窝结构面外压缩性能和破坏模式
Table 2. Failure modes of the different C/C honeycomb structure specimens under various loadings
l/mm Test item Specimens type Modulus/MPa Strength/MPa Failure mode 10 Compression Sandwich panel 159 5.1 Wall delamination Honeycomb 168 3.0 Wall delamination 15 Compression Honeycomb 161 2.1 Wall delamination 7.5 Compression Honeycomb 243 6.6 Core crushing 5 Compression Honeycomb 274 8.2 Wall delamination
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表 3 边长10 mm碳/碳蜂窝剪切性能和破坏模式
Table 3. Failure modes of the different C/C honeycomb structure specimens under various loadings
l/mm Test item Modulus/MPa Strength/MPa Failure mode 10 L shear 60 1.3 Core debonding W shear 64 0.9 Wall delamination
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