碳纤维截面特性对碳纤维/环氧树脂复合材料压缩强度的影响

石佩洛; 尚呈元; 陈亮; 赵红燕; 周宇; 朱世鹏; 左小彪

doi:10.13801/j.cnki.fhclxb.20210203.001

碳纤维截面特性对碳纤维/环氧树脂复合材料压缩强度的影响

doi: 10.13801/j.cnki.fhclxb.20210203.001

航天材料及工艺研究所，北京 100076

基金项目: 材料攻关项目(024)；国防青年基金 (2020-041)

详细信息

通讯作者:
左小彪，博士，研究员，研究方向为树脂基复合材料　E-mail：hotzuo1978@163.com

中图分类号: TB332；TQ327.3
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-08
- 录用日期: 2021-01-22
- 网络出版日期: 2021-02-03
- 刊出日期: 2021-12-01

Compressive strength of carbon fiber reinforced epoxy composites with various carbon fiber cross section characteristics

Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China

摘要

摘要: 基于压拉平衡为特征的新一代先进复合材料的需求，开展了碳纤维截面形状和尺寸对碳纤维/环氧树脂复合材料压缩强度的影响研究。有限元模拟和试验结果均表明，增大碳纤维直径可以提高复合材料压缩强度。另外碳纤维截面形状也对复合材料压缩强度有影响，圆形截面优于椭圆形截面。
- 碳纤维增强树脂基复合材料 /
- 压缩强度 /
- 纤维直径 /
- 截面形状 /
- 有限元模拟
Abstract: Based on the demand of new generation advanced composites characterized by the balance of com-pressive and tensile strength, the compressive strength of carbon fiber/epoxy composites with various cross section characteristics of carbon fibers was studied by finite element simulation and experiment. Results show that the compressive strength of carbon fiber/epoxy composite increases with the increasing fiber diameter, and round is better than ellipse regarding to the fiber cross section shape.
- carbon fiber reinforced epoxy composites /
- compressive strength /
- fiber diameter /
- cross section shape /
- finite element simulation

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图 1 4种碳纤维微观形貌SEM图像

Figure 1. SEM images of 4 types of carbon fibers

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图 2 碳纤维/环氧树脂复合材料压缩失效宏观和微观形貌

Figure 2. Macroscopic and microscopic observations of carbon fiber/epoxy composites after compression

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图 3 3种典型碳纤维截面形貌简化示意图

Figure 3. Schematic diagrams of 3 typical section shapes of carbon fibers

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图 4 4种碳纤维/环氧树脂复合材料0°压缩强度-纤维最小直径d_m的关系

Figure 4. 0° compressive strength-fiber minimum diameter d_m curve for 4 types of carbon fiber/epoxy composites

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图 5 碳纤维/环氧树脂复合材料压缩有限元模型

Figure 5. Simulation model of compression for carbon fiber/epoxy composites

λ—Half wavelength of a sinusoidal period; d_f—Fiber diameter

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图 6 有限元计算碳纤维/环氧树脂复合材料压缩应力-应变曲线

Figure 6. Compressive stress-strain curve of carbon fiber/epoxy composite by simulation

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图 7 碳纤维/环氧树脂复合材料压缩强度-纤维直径d的关系曲线

Figure 7. Compressive strength-fiber diameter d curves of carbon fiber/epoxy composites

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表 1 4种碳纤维性能

Table 1. Properties of 4 types of carbon fibers

Type	Strength σ/MPa	Modulus E/GPa	Diameter/μm	Section shape	Surface roughness
T800H	5790	294	5.0	Ellipse	Obvious
TG800-1	5820	292	5.0	Round	Obvious
TG800-2	5860	292	5.3	Round	Obvious
TG800-3	5830	294	5.8	Round	Obvious

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表 2 4种碳纤维/环氧复合材料力学性能

Table 2. Mechanical properties of 4 types of carbon fiber/epoxy composites

Type	0° tensile strength/MPa	0° compressive strength/MPa	Compressive/tensile strength ratio
T800H/603B	2770±180	1390±85	0.50
TG800-1/603B	2750±170	1505±71	0.55
TG800-2/603B	2805±210	1560±95	0.56
TG800-3/603B	2790±180	1660±93	0.60

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表 3 3种典型碳纤维截面惯性矩计算

Table 3. Sectional inertia moments of 3 typical section shapes of carbon fibers

Shape	Round	Ellipse	Round with grooves
I (Equation)/μm⁴	$ {\mathrm{{\text{π}} }d}^{4}/64 $	$ \mathrm{{\text{π}} }a{b}^{3}/64 $	$ {\mathrm{{\text{π}} }d}^{4}/64+{\mathrm{{\text{π}} }d}^{2}{t}^{2}/192 $
S (Equation)/μm²	$ {\mathrm{{\text{π}} }d}^{2}/4 $	$ \mathrm{{\text{π}} }ab/4 $	$ {\mathrm{{\text{π}} }d}^{2}/4 $
Parameters/μm	d=5	a=6.25, b=4	d=5, t=0.5
S (Value)/μm²	6.25π	6.25π	6.25π
I (Value)/μm⁴	9.76π	6.25π	9.80π
Notes: I—Minimum moment of inertia; S—Section area d—Diameter for round section; a—Long axis of ellipse; b—Short axis of ellipse; t—Groove depth.

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