CNT/EMAA/环氧胶膜对复合材料裂纹的电热修复研究

doi:10.19936/j.cnki.2096-8000.20220328.010

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (3): 66-72.DOI: 10.19936/j.cnki.2096-8000.20220328.010

CNT/EMAA/环氧胶膜对复合材料裂纹的电热修复研究

王维, 欧阳琴, 刘玲^*

同济大学航空航天与力学学院复合材料与结构研究所,上海200092

收稿日期:2021-05-31 出版日期:2022-03-28 发布日期:2022-04-24
通讯作者: 刘玲(1973-),女,博士,教授,主要从事复合材料方面的研究,lingliu@tongji.edu.cn。
作者简介:王维(1995-),男,硕士,主要从事复合材料方面的研究。
基金资助:
中国国家自然科学基金(11972256)

Research on electrical-heating activated healing of composite cracks by CNT/EMAA/epoxy film

WANG Wei, OUYANG Qin, LIU Ling^*

School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

Received:2021-05-31 Online:2022-03-28 Published:2022-04-24

摘要/Abstract

摘要： 脆性环氧树脂复合材料在外载荷作用下易产生裂纹,从而影响材料的力学性能和完整性,如果能在裂纹发生时及时进行修复,可提高材料的可靠性和使用寿命。本文以热塑性聚乙烯-甲基丙烯酸(EMAA)为裂纹修复剂,将其和碳纳米管(CNT)引入环氧树脂,制备了具有裂纹电热修复功能的CNT/EMAA/环氧胶膜。首先研究了其对自身拉伸强度的修复效率,然后将其作为胶层粘接复合材料T型接头,研究其对T型接头剥离损伤的电热修复效率。结果表明,通电加热作用下,CNT/EMAA/环氧胶膜对拉伸强度的修复率为73.8%。并且,T型接头发生完全剥离破坏和初始损伤剥离裂纹后,其对应载荷的电热修复率分别为75.0%和121.2%。表明本文制备的CNT/EMAA/环氧胶膜对裂纹具有较好的电热修复性能,与传统的烘箱加热基本具有相同的修复效果。

关键词: 碳纳米管(CNT), 聚乙烯-甲基丙烯酸(EMAA), 裂纹修复, 电加热, 复合材料

Abstract: Brittle epoxy composites are easy to initiate cracks under external loads, thereby affecting the mechanical properties and integrity of the composites. If these cracks can be healed in time, the reliability and service lives of the composites can be improved. Therefore, in this paper, thermoplastic copolymer poly (ethylene-co-methacrylic acid) (EMAA) is used as a crack healing agent, and carbon nanotubes (CNT) are introduced into epoxy at the same time to prepare a CNT/EMAA/epoxy film, which has electrical-heating activated crack healing function. Firstly, EMAA films with ordered holes are prepared by hot-pressing and then sprayed with CNT. Next, the CNT/EMAA films are infiltrated with epoxy to prepare CNT/EMAA/epoxy adhesive films. Then, the healing efficiency of tensile strength is studied. Finally, the adhesive film is used as glue layers to bond composite T-joints, and the healing efficiency of T-joint peeling damage is studied. The results show that the healing efficiency of the CNT/EMAA/epoxy film on tensile strength is 73.8% by using the electrical-heating method. In addition, when the T-joints are completely peeling failed or start initial damage cracks, the electrical-heating healing efficiencies of the corresponding peeling load are 75.0% and 121.2%, respectively. The results indicate that the CNT/EMAA/epoxy adhesive film prepared in this paper has good crack healing properties, and the healing effect of electrical-heating is the same as traditional oven-heating.

Key words: carbon nanotube (CNT), poly (ethylene-co-methacrylic acid) (EMAA), crack healing, electrical-heating, composites

中图分类号:

TB332

王维, 欧阳琴, 刘玲. CNT/EMAA/环氧胶膜对复合材料裂纹的电热修复研究[J]. 复合材料科学与工程, 2022, 0(3): 66-72.

WANG Wei, OUYANG Qin, LIU Ling. Research on electrical-heating activated healing of composite cracks by CNT/EMAA/epoxy film[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(3): 66-72.

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CNT/EMAA/环氧胶膜对复合材料裂纹的电热修复研究

Research on electrical-heating activated healing of composite cracks by CNT/EMAA/epoxy film

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