Abstract This paper investigates the penetration resistance of Ultra‐High Toughness Cementitious Composites (UHTCC, also known as ECC) and Reactive Powder Concrete (RPC, commonly referred to as UHPC) when subjected to multi‐point projectile impacts at varying projectile velocities. Firstly, basic mechanical performance tests were conducted on RPC and UHTCC. Subsequently, multi‐point projectile impact tests were carried out on 500 mm‐thick RPC and UHTCC targets using a 14.5 mm ballistic gun at different projectile velocities and impact locations. The test results show that RPC exhibits excellent resistance against projectile penetration, with resistance approximately 2.5 times that of UHTCC under identical conditions. However, UHTCC demonstrates superior performance in reducing the crater damage on the impact surface and in resisting cracking. Under the same penetration test conditions, the crater area of UHTCC is 50% smaller than that of RPC. After multi‐point projectile impacts, the penetration resistance of UHTCC decreases significantly, whereas that of RPC remains unchanged regardless of the number of impacts or projectile velocity. Finally, based on the existing test data of UHTCC and RPC, the calibrated K&C dynamic constitutive model was employed, and the restart method was used to simulate the penetration process of multi‐point projectile impacts on UHTCC and RPC targets. The simulation results predicted by the calibrated K&C model correspond well with the experimental results.
Wu et al. (Thu,) studied this question.