Dynamic Damage Behavior and Anisotropic Mechanism of 3D Printed Reinforced Concrete Subjected to Penetration (2024-12)¶

The application of 3D printed concrete (3DPC) technology in military area has been a feasible option in recent years, but there are few studies on the dynamic mechanical properties of 3DPC materials. In this paper, 3DPC targets were subjected to projectile impacts by 7.62 mm bullets, where the penetration depth, the mass loss and the anisotropic mechanism of 3DPC targets were discussed. The results showed that the penetration depth and mass loss of 3DPC targets were anisotropic. It was found that differences between the strength of the 3DPC matrix and interface led to ballistic deflection of the bullet, resulting in decrease of penetration depth. Reinforcement of basalt fiber mesh (BFM) and glass fiber (GF) improved the strength of the 3DPC targets to reduce the penetration depth. Meanwhile, the deflection of the bullets may be influenced by the reinforcements. Ceramic aggregates (CA) significantly reduced the penetration depth from over 160 mm to 26 mm, while the mass loss increased because of the interface failure between the aggregates and matrixes. The mass loss could be reduced by BFM for it constrained effect on the aggregates.