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

doi:10.19936/j.cnki.2096-8000.20220328.010

Abstract

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

CLC Number:

TB332

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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