曲面碳/碳蜂窝制备及其均布载荷下的力学性能

武豪; 李玮洁; 张中伟; 刘愚; 雷宇; 史文童; 董志超

曲面碳/碳蜂窝制备及其均布载荷下的力学性能

武豪¹,
李玮洁^2, ,,
张中伟^1, ,,
刘愚^3, ,,
雷宇¹,
史文童¹,
董志超⁴

1.
北京理工大学　先进结构技术研究院, 北京 100081
2.
北京交通大学　土木建筑工程学院, 北京 100044
3.
中南大学　粉末冶金研究院, 长沙 410083
4.
山东理工大学　材料科学与工程学院, 淄博 255049

基金项目: 国家重点研发计划(2022YFB3706100)

详细信息

通讯作者:
李玮洁，博士，教授，博士生导师，研究方向为新型材料和结构的力学行为　E-mail: wj.li@bjtu.edu.cn

张中伟，博士，研究员，博士生导师，研究方向为碳/碳、碳/陶、超高温陶瓷等复合材料　E-mail: zhangzhongw@163.com

刘愚，博士，副研究员，硕士生导师，研究方向为碳基复合材料　E-mail: yu_liu@csu.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-12-08
- 修回日期: 2024-01-19
- 录用日期: 2024-01-31
- 网络出版日期: 2024-03-12

Preparation of curved carbon/carbon honeycomb and its mechanical properties under uniform load

WU Hao¹,
LI Weijie^{2
, ,},
ZHANG Zhongwei^{1
, ,},
LIU Yu^{3
, ,},
LEI Yu¹,
SHI Wentong¹,
DONG Zhichao⁴

1.
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
2.
Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China
3.
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
4.
School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China

Funds: National Key Research and Development Program of China (2022YFB3706100)

摘要

摘要: 精密仪器对承载平台结构的要求不断提高，蜂窝结构由于其轻质和超高稳定性的特点而受到广泛关注。为了满足异形复合材料承载平台的需求，本文采用热压成型和树脂浸渍碳化-化学气相沉积(CVD)相结合的工艺制备了不同规格曲面碳/碳蜂窝结构试样，而后，根据曲面蜂窝的结构特点和服役环境，设计了均布载荷的测试方法对不同试样进行压缩试验，分析了蜂窝厚度、铺层角度、曲率半径等因素对曲面蜂窝力学性能的影响规律。结果表明，当蜂窝的径向厚度增大时，蜂窝壁屈曲程度增大，蜂窝双层壁处所受载荷增大，胶粘面开裂倾向更加显著；当蜂窝纤维取向由0°至45°转变蜂窝壁皱曲转变方式为不皱曲-韧性皱曲-塑性皱曲；当曲面蜂窝的曲率半径减小时，其破坏模式逐渐由双层壁脱粘开裂向蜂窝壁的屈曲断裂转变。本文制备的曲面碳/碳蜂窝压缩强度达到1.48 MPa，具备良好的力学性能，可以满足日益复杂化的航天结构承载需求。
- 碳/碳复合材料 /
- 曲面蜂窝 /
- 均布载荷 /
- 破坏模式
Abstract: With the increasing demand of precision instruments on the bearing platform structure, honeycomb structure has been widely concerned because of its light weight and ultra-high stability. In order to meet the requirements of the special-shaped composite bearing platform, this paper uses the combination of hot pressing and resin impregnation carbonization and chemical vapor deposition (CVD) to prepare the curved carbon/carbon honey-comb structure samples of different specifications. Then, according to the structural characteristics of curved honeycomb and the service environment, a test method of uniform load is designed to conduct compression tests on different samples. The influences of honeycomb thickness, layering angle and curvature radius on the mechanical properties of curved honeycomb were analyzed. The results show that when the radial thickness of honeycomb increases, the bending degree of honeycomb wall increases, the load on honeycomb double-walled space increases, and the cracking tendency of adhesive surface becomes more obvious. When the orientation of honeycomb fiber changes from 0° to 45°, the bending mode of honeycomb wall changes to non-buckling, ductile buckling and plastic buckling. When the curvature radius of curved honeycomb decreases, the failure mode gradually changes from decudation cracking to buckling fracture of honeycomb wall. The curved carbon/carbon honeycomb prepared in this paper has a compressive strength of 1.48 MPa, and has good mechanical properties, which can meet the requirements of increasingly complex aerospace structures.
- carbon/carbon composite materials /
- curved honeycomb /
- uniform load /
- destruction mode

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图 1 曲面蜂窝结构与胞元选取示意图

Figure 1. Curved honeycomb structure and cell selection diagram

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图 2 两种曲面蜂窝的构型

Figure 2. Two curved honeycomb configurations

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图 3 曲面碳/碳蜂窝的制备及测试过程

Figure 3. Preparation and testing process of C/C curved honeycomb

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图 4 曲面蜂窝载荷分解示意图

Figure 4. Diagram of honeycomb load decomposition of curved surface

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图 5 化学气相沉积后蜂窝样品的断口微观形貌

Figure 5. Fracture morphology of honeycomb samples after CVI

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图 6 C1规格蜂窝压缩破坏载荷-位移曲线

Figure 6. C1 honeycomb compression failure load-displacement curve

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图 7 C1规格蜂窝压缩破坏过程

Figure 7. C1 specification cellular compression breakdown process

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图 8 曲面蜂窝不同位置受力示意图

Figure 8. Force diagram of curved honeycomb at different positions

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图 9 C2规格蜂窝压缩破坏载荷-位移曲线

Figure 9. C2 honeycomb compression failure load-displacement curve

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图 10 C2规格蜂窝压缩破坏过程

Figure 10. C2 specification cellular compression breakdown process

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图 11 C1、C2、C3规格蜂窝压缩破坏载荷-位移曲线

Figure 11. C1, C2, C3 honeycomb compression failure load-displacement curve

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图 12 C3规格蜂窝压缩破坏过程

Figure 12. C3 specification cellular compression breakdown process

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图 13 C4规格蜂窝压缩破坏过程

Figure 13. C4 specification cellular compression destruction process

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图 14 C1、C5、C6规格蜂窝压缩破坏载荷-位移曲线

Figure 14. C1, C5, C6 honeycomb compression failure load-displacement curve

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图 15 C5规格蜂窝压缩破坏过程

Figure 15. C5 specification honeycomb compression failure process

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图 16 C6规格蜂窝压缩破坏过程

Figure 16. C6 specification honeycomb compression failure process

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表 1 不同设计参数下样品的规格与编号

Table 1. Sample specification and number under different design parameters

Specification number	Radius of curvature /mm	Radial thickness /mm	Fiber orientation	weight /g	density /(g·cm⁻³)
C1	180	20	0°/90°	8.73	0.380
C2	180	15	0°/90°	5.68	0.334
C3	180	20	30°/−60°	7.74	0.337
C4	180	20	45°/−45°	8.11	0.353
C5	150	20	0°/90°	8.66	0.373
C6	120	20	0°/90°	8.49	0.360

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表 2 不同曲面径向厚度曲面蜂窝的压缩强度

Table 2. Compressive strength of curved honeycomb with different axial thickness

Specification number	Radial thickness /mm	Compressive strength /MPa	Dispersion ratio /%
C1	20	1.157	4.15
C2	15	1.422	3.47

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表 3 不同纤维取向曲面蜂窝的压缩强度

Table 3. Compressive strength of honeycomb with different fiber orientation curved surfaces

Specification number	Fiber orientation	Compressive strength /MPa	Dispersion ratio /%
C1	0°/90°	1.157	4.15
C3	30°/−60°	1.476	7.79
C4	45°/−45°	1.366	6.81

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表 4 不同曲率半径曲面蜂窝的压缩强度

Table 4. Compressive strength of curved honeycomb with different curvature radius

Specification number	Radius of curvature /mm	Compressive strength /MPa	Dispersion ratio /%
C1	180	1.157	4.15
C5	150	1.237	7.11
C6	120	1.322	1.29

下载: 导出CSV

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