Dynamic properties and SPH simulation of functionally graded cementitious composite subjected to repeated penetration

Functionally graded cementitious composite (FGCC) was prepared by varying distribution of high strength fibers and aggregates. The anti-penetration layer and crack resistance layer of FGCC were made of ultra high performance coarse aggregate concrete and ultra high performance steel fiber reinforced concrete respectively. The resistance of FGCC against repeated penetration was researched. The penetration depth, fracture pattern and penetration damage of different concrete targets were measured. Results show that the penetration depth, crater area and penetration damage were decreased greatly by the synergistic effects of high strength fibers and coarse aggregates. The cracking and spalling of concrete target were prevented by the combined actions of the anti-penetration and crack resistance layers. The fracture process and damage development of FGCC subjected to projectile impact were simulated by smoothed particle hydrodynamics (SPH) method. The effects of coarse aggregates distance on the penetration depth and damage of FGCC were investigated.