吸湿耦合四点弯曲载荷条件下碳纤维复合材料的性能演变规律

范燕生; 顾轶卓; 王俊涛; 石亮; 王绍凯; 李敏

吸湿耦合四点弯曲载荷条件下碳纤维复合材料的性能演变规律

范燕生^{1, 2},
顾轶卓^{2, 3, ,},
王俊涛¹,
石亮¹,
王绍凯²,
李敏²

1.
中国航空综合技术研究所检测与损伤评价中心, 北京 100028
2.
北京航空航天大学材料科学与工程学院, 北京 100191
3.
天目山实验室, 杭州 310023

详细信息

通讯作者:
顾轶卓，博士，副教授，博士生导师，研究方向为树脂基复合材料、碳纤维、纳米复合材料　E-mail: benniegu@buaa.edu.cn

中图分类号: TB332
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- 文章访问数: 98
- HTML全文浏览量: 46
- 被引次数: 0
出版历程
- 收稿日期: 2024-04-16
- 修回日期: 2024-05-20
- 录用日期: 2024-06-02
- 网络出版日期: 2024-06-22

Performance evolution of carbon fiber composites under moisture absorption coupled four-point bending load

FAN Yansheng^{1, 2},
GU Yizhuo^{2, 3
, ,},
WANG Juntao¹,
SHI Liang¹,
WANG Shaokai²,
LI Min²

1.
Testing and Damage Evaluation Center, AVIC China Aero-Polytechnology Establishment, Beijing, 100028, China
2.
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
3.
Tianmushan Laboratory, Hangzhou, 310023, China

摘要

摘要: 为研究吸湿耦合四点弯曲载荷条件下碳纤维增强环氧树脂基复合材料的性能演变规律，通过自行设计的夹具施加四点弯曲载荷，并耦合5倍浓度模拟海水吸湿环境以模拟复合材料承载结构在海水中的服役条件。通过裂纹观测系统原位监测复合材料在力学实验过程中的损伤萌生与扩展，对比分析不同预处理条件对复合材料剩余力学性能及损伤模式的影响，分别通过四点弯曲、三点弯曲及短梁剪切力学试验，对预处理中复合材料的加载区域、等弯矩段进行评估。结果表明，预处理后复合材料的四点弯曲性能降低，一端加载处出现损伤破坏后，随之继续发生多次载荷下降直至最终失效发生；复合材料的等弯矩段短梁剪切性能无明显变化，三点弯曲力学试验结果表明预处理条件对等弯矩段的应力集中作用不显著。从而，预处理条件对加载区域影响显著，使其在失效过程中呈现出多断口扩展，伴随有层间裂纹扩展现象，而对等弯矩段无显著影响。
- 碳纤维复合材料 /
- 四点弯曲 /
- 模拟海水 /
- 吸湿 /
- 损伤模式
Abstract: In order to study the performance evolution of carbon fiber reinforced epoxy composites under moisture absorption coupling four-point bending load, a four-point bending loading fixture was self-designed to provide the load condition, and 5 times concentration of seawater simulating moisture environment was coupled to simulate the service condition. The damage initiation and propagation process of composite under mechanical loading were monitored in situ by self-designed crack observation system. The effects of different pretreatment conditions on mechanical properties and damage modes were compared and analyzed. The loading area and equal bending moment area of composite under four-point bending pretreatment conditions were evaluated by four-point bending, three-point bending and short beam shearing test, respectively. The results show that the four-point bending property is decreased after pretreatment, the composite is damaged at one end of the loading at first, and then the load continues to decline for several times until the final failure occurs. There is no obvious change in the short beam shearing performance of the equal bending moment section. The three-point bending mechanical test results show that the pretreatment has no significant stress concentration effect on the equal bending moment area. Thus, the pretreatment conditions had a significant effect on the loading area but insignificant on the equal bending moment area. Multiple fracture propagation was observed on the loading area during the failure process, accompanied by interlayer crack propagation.
- carbon fiber composite /
- four-point bending /
- simulated seawater /
- moisture absorption /
- damage mode

HTML全文

图 1 (a)自行设计的四点弯曲夹具载荷施加实验；(b)吸湿耦合四点弯曲载荷条件预处理实验；(c)四点弯曲力学实验；(d)原位裂纹观测实验

Figure 1. (a)Self-designed four-point bending fixture loading experiment; (b)Moisture absorption coupling four-point bending loading pretreatment experiment; (c)Four-point bending mechanical experiment; (d)In-situ crack observation experiment

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图 2 吸湿耦合四点弯曲载荷预处理后，复合材料力学性能评价

Figure 2. Evaluation of mechanical properties of composites after 5 times seawater moisture coupled with four-point bending load pretreatment

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图 3 四点弯曲载荷加载过程的有限元模型

Figure 3. Finite element model for four-point bending load

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图 4 未经预处理，T800级碳纤维复合材料层合板载荷-位移曲线：(a)三点弯曲，(b)四点弯曲

Figure 4. Load-displacement curve of untreated T800 carbon fiber composite laminate: (a) three-point bending, (a) four-point bending

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图 5 未经预处理，T800级碳纤维复合材料四点弯曲左侧(a-d)、右侧(e-h)压头处失效形貌特征

Figure 5. Failure morphology of the left and right loading position of untreated T800 carbon fiber composite laminate under four-point bending experiment

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图 6 未经预处理，T800级碳纤维复合材料层合板中心等弯矩段位置处失效形貌特征

Figure 6. Failure morphology characteristics at the position of equal bending moment section in the center of untreated T800 carbon fiber composite laminate

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图 7 经预处理后，T800级碳纤维复合材料层合板的四点弯曲性能对比图

Figure 7. Comparison of four-point bending properties of T800 carbon fiber composite laminate after pretreatment

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图 8 T800级碳纤维复合材料层合板的四点弯曲载荷位移对比图：(a)未经预处理、(b)预处理7天后、(c)预处理14天后、(d)预处理21天后

Figure 8. Comparison of four-point bending load displacement of T800 carbon fiber composite laminate: (a) without pretreatment, (b) with pretreatment for 7 days, (c) with pretreatment for 14 days, (d) with pretreatment for 21 days.

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图 9 5倍盐水+60%四点弯曲载荷条件下处理7天，T800级碳纤维复合材料层合板四点失效形貌特征(a)左侧加载处，(b)右侧加载处

Figure 9. Four-point failure morphology characteristics of T800 carbon fiber composite laminate after 7 days pretreatment under 5 times seawater moisture coupled with 60% four-point bending load (a)the left loading position, (b)the right loading position

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图 10 5倍盐水+60%四点弯曲载荷条件下处理14天，T800级碳纤维复合材料层合板四点失效形貌特征(a)左侧加载处，(b)右侧加载处

Figure 10. Four-point failure morphology characteristics of T800 carbon fiber composite laminate after 14 days pretreatment under 5 times seawater moisture coupled with 60% four-point bending load (a)the left loading position, (b)the right loading position

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图 11 5倍盐水+60%四点弯曲载荷条件下处理21天，T800级碳纤维复合材料层合板四点失效形貌特征(a)左侧加载处，(b)等弯矩段，(c)右侧加载处

Figure 11. Four-point failure morphology characteristics of T800 carbon fiber composite laminate after 21 days pretreatment under 5 times seawater moisture coupled with 60% four-point bending load (a)the left loading position, (b) the equal bending moment area, (c)the right loading position

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图 12 经预处理后，T800级碳纤维复合材料层合板的三点弯曲性能对比图

Figure 12. Comparison of three-point bending properties of T800 carbon fiber composite laminate after pretreatment

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图 13 吸湿耦合60%(a)四点弯曲(b)三点弯曲载荷处理14天，T800级碳纤维复合材料层合板三点弯曲失效过程对比图

Figure 13. Comparison of three-point bending failure process of T800 carbon fiber composite laminate after 5 times seawater moisture coupled with 60% (a) four-point bending (b) three-point bending load pretreatment for 14 days

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图 14 吸湿耦合60%(a)四点弯曲(b)三点弯曲载荷处理21天，T800级碳纤维复合材料层合板三点弯曲失效过程对比图

Figure 14. Comparison of three-point bending failure process of T800 carbon fiber composite laminate after 5 times seawater moisture coupled with 60% (a) four-point bending (b) three-point bending load pretreatment for 21 days

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图 15 经预处理后，T800级碳纤维复合材料层合板的等弯距段短梁剪切性能对比

Figure 15. Comparison of short-beam shear properties of T800 carbon fiber composite laminate after pretreatment

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图 16 四点弯曲载荷条件下复合材料层合板的应力分布情况

Figure 16. Stress distribution of composite laminate under four-point bending load

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表 1 未经预处理，T800级碳纤维复合材料层合板四点弯曲性能

Table 1. Four-point bending properties of untreated T800 carbon fiber composite laminate

Width/
mm Thickness/
mm Bending
load/N Bending
strength/MPa Bending
modulus/GPa

13.1 1.95 1197 1441 223

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