低速多次冲击下碳纤维/环氧树脂基复合材料层合板失效机制及剩余强度评估

俞鸣明; 朱雪莉; 刘雪强; 方琳; 谢旺; 任慕苏; 孙晋良

doi:10.13801/j.cnki.fhclxb.20230510.001

低速多次冲击下碳纤维/环氧树脂基复合材料层合板失效机制及剩余强度评估

doi: 10.13801/j.cnki.fhclxb.20230510.001

1.
上海大学　材料科学与工程学院，上海 200444
2.
军需工程技术研究所，北京 100010

基金项目: 广东省重点研发计划(2019B010929001)；上海市优秀学术/技术带头人计划(20XD1434300)

详细信息

通讯作者:
方琳，硕士，实验师，研究方向为碳纤维复合材料　E-mail: lfang@shu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2023-03-08
- 修回日期: 2023-04-18
- 录用日期: 2023-04-29
- 网络出版日期: 2023-05-11
- 刊出日期: 2023-09-15

Failure mechanism and assessment of residual strength of carbon fiber/epoxy resin matrix composite laminates under multiple impacts at low velocities

1.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2.
Institute of Military Engineering and Technology, Beijing 100010, China

Funds: Key R&D Program of Guangdong Province (2019B010929001); Sponsored by Program of Shanghai Academic/Technology Research Leader (20XD1434300)

摘要

摘要: 碳纤维(Carbon fiber，CF)增强环氧树脂(Epoxy resin，EP)基复合材料因其优异的抗冲击性而被广泛应用在飞机结构件。考虑到飞机在飞行过程中部分结构会遭受多次冲击的工况，设计CF/EP复合材料层合板的多次冲击及冲击后压缩试验。通过对多次冲击的力学响应曲线分析及内部损伤图观测，得到不同冲击载荷对复合材料多次冲击的力学性能影响及多次冲击过程中的主要损伤机制和损伤传播模式。在此基础上，对冲击后的剩余压缩强度及失效形貌进行了分析，得到了CF/EP复合材料层合板在冲击后的损伤容限及失效模式。结果表明：冲击次数的提高将导致复合材料的吸能性下降，抗冲击性下降。在多次冲击过程中，复合材料层合板的损伤模式为自下而上。此外，随冲击能级变化，复合材料在冲击后压缩过程中的主要损伤模式有所变化。
- 复合材料 /
- 多次冲击 /
- 低速冲击 /
- 冲击损伤 /
- 剩余强度
Abstract: Carbon fiber (CF) reinforced epoxy resin (EP) matrix composites were widely used in aircraft structural components due to their excellent impact resistance. Considering that some of the structures of aircraft were subjected to multiple impacts during flight, the CF/EP composite laminates were designed for multiple impacts and compression after impact tests. The mechanical response curves and internal damage diagrams of the multiple impacts were analyzed to obtain the effects of different impact loads on the mechanical properties of the composites during multiple impacts, as well as the main damage mechanisms and damage propagation modes during the multiple impacts. On this basis, the residual compression strength and failure morphology after impact were analyzed to obtain the damage tolerance and failure mode of CF/EP composite laminates after impact. The results show that an increase in the number of impacts will lead to a decrease in the energy absorption and impact resistance of the composites. During multiple impacts, the damage pattern of the composites is bottom-up. In addition, the main damage modes of the composites during compression after impact vary with the impact energy level.
- composite materials /
- multiple impacts /
- low velocity impacts /
- impact damage /
- residual strength

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图 1 碳纤维(CF)/环氧树脂(EP)复合材料层合板铺层示意图

Figure 1. Carbon fiber (CF)/epoxy resin (EP) composite laminates lamination diagram

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图 2 试验仪器及夹具

Figure 2. Test apparatus and fixtures

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图 3 CF/EP层合板在不同冲击能量下的冲击力-时间响应曲线

Figure 3. Force-time response curves for CF/EP laminates at different impact energies

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图 4 CF/EP层合板在不同冲击能量下的冲击力-位移响应曲线

Figure 4. Force-displacement response curves for CF/EP laminates at different impact energies

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图 5 CF/EP层合板在不同冲击能量下的能量-时间响应曲线

Figure 5. Energy-time response curves for CF/EP laminates at different impact energies

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图 6 CF/EP层合板在不同冲击能量下的C扫描检测结果

Figure 6. C-scan test results of CF/EP laminates at different impact energies

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图 7 CF/EP层合板在多次冲击下不同铺层角度的层内损伤CT检测结果

Figure 7. CT results of intra-laminar damage of CF/EP laminates under multiple impacts with different lay-up angles

L1-L16—Layer 1-layer 16

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图 8 CF/EP层合板在多次冲击下的层内损伤面积

Figure 8. Area of intra-laminar damage of CF/EP laminates under multiple impacts

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图 9 CF/EP层合板在多次冲击下的损伤失效过程示意图

Figure 9. Schematic diagram of the damage failure process of CF/EP laminates under multiple impacts

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图 10 CF/EP层合板压缩过程中的载荷-位移曲线

Figure 10. Load-displacement curves during compression of CF/EP laminates

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图 11 CF/EP层合板在压缩失效时的损伤位置示意图

Figure 11. Schematic diagram of the location of damage to CF/EP laminates in the event of compression failure

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图 12 CF/EP层合板在不同位置的表面损伤

Figure 12. Surface damage of CF/EP laminates at different locations

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图 13 CF/EP层合板在不同冲击能量下的层内损伤CT检测结果

Figure 13. CT results of intra-laminar damage in CF/EP laminates at different impact energies

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图 14 CF/EP层合板的压缩失效示意图

Figure 14. Schematic diagram of compression failure of CF/EP laminates

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