Damage characteristics and dynamic response of steel-concrete-steel composite targets penetrated by a rigid projectile

Steel-concrete-steel (SCS) composite structures have a good load-bearing capacity and are widely utilized in engineering construction. To investigate the penetration resistance of SCS composite structures, rigid projectile impact target tests of SCS composite targets were carried out. In this paper, the damage characteristics of SCS composite targets were obtained by using shape-measuring and three-dimensional scanning imaging techniques. The dynamic responses of the composite targets were recorded by using strain sensors and acceleration sensors. The results show that the damage degree of steel plates and concrete attack surfaces of the SCS composite structure targets were proportional to the impact velocity of the projectiles. In contrast, the crater formation on the concrete backside was the worst when the collapse occurred. According to the target damage characteristics, the typical damage modes of the SCS composite target for three typical impact velocities were determined. Besides, by comparing the energy consumption of the projectile in the process of penetrating the SCS target with different steel plate combination forms and the concrete target, it was found that the SCS target with the combination form of 3 mm + 4 mm had better anti-penetration performance.