Dynamic behavior of functional graded cementitious composite under the coupling of high speed penetration and explosion

Functionally graded cementitious composite (FGCC) targets were prepared for better impact resistance. Normal concrete targets and ultra-high performance concrete (UHPC) targets were prepared as the control group. Coupling experiments of high speed penetration (850-1300 m/s) and explosion were carried out on all targets. Results showed that FGCC targets had better impact resistance than UHPC and normal concrete targets. The reinforcement of high strength coarse aggregates played an important role in high speed penetration resistance. The sizes of destruction crater were reduced because of the reinforcement of fibers. The impact energy spread horizontally and the internal structure was protected because of the layer structure of FGCC targets. The effect of high speed penetration to explosion resistance was researched by coupling experiments. According to the experiment results, improved empirical formulas for penetration, explosion and coupling of penetration and explosion were proposed respectively. The deviations among experiments and models were limited in 1%, 3% and 10% respectively.