Study on the self-sealing properties of POZD coated aluminium composite structure penetrated by projectiles

The protective technology of fuel tanks has attracted the attention of scholars at home and abroad, and higher requirements have been placed on the protective coatings of fuel tanks. They must not only meet the requirements of impact resistance but also achieve the function of self-healing of perforation. In order to explore the self-healing effect of fuel tank coatings on perforation by projectiles, a POZD-coated aluminium composite structure was designed. The self-healing mechanism of the POZD-coated aluminium composite structure was analysed using a test research method to explore the effects of coating thickness and aluminium thickness on self-healing performance. The results show that the POZD-coated aluminium composite structure exhibits strong self-healing properties when penetrated by projectiles. The self-healing characteristics are significantly influenced by the application technique and thickness of the POZD coating, whereas the thickness of the aluminum plate exerts a relatively minor effect. Through structural design, the POZD-coated aluminium composite structure can achieve complete self-sealing of perforations by 7.62 mm projectiles, providing a technical reference for the design of lightweight self-healing fuel tanks in the future.