Abstract
The impact resistance of coarse-aggregated layered Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is investigated numerically with LS-DYNA. The Holmquist Johnson Concrete (HJC) model is employed to describe the dynamic behavior of the UHPFRC, and the effect of the coarse aggregates is reflected in the pressure-compaction relation. Mechanical tests are conducted to obtain the material-related inputs for the numerical model, and ballistic experiments are applied to calibrate the model parameter as well as to validate the simulation results. After valuation, the ballistic histories of the projectile and the penetration processes in the UHPFRC targets are analyzed. Furthermore, the study discusses the effects of the target thickness on the depth of penetration, showing the possibility to replace a thicker single-layered target by a thinner triple-layered one to achieve the same level of protection. Finally, perforation limits of the single- and tripled-layered UHPFRC at different impact velocities are estimated, based on which the ACE formulae are modified to accurately predict the perforation limit of the coarse-aggregated layered UHPFRC. The numerical simulations in this study reveal that the triple-layered target requires fewer dosages of cement and steel fibers in comparison to its single-layered counterpart with the same level of ballistic protection.
Highlights
The increasing risks of terrorist attacks in the current world clearly show the necessity of improving the impact resistance of important buildings and infrastructures
The Holmquist Johnson Concrete (HJC) model is employed to describe the dynamic behavior of the Ultra-High Performance Fiber Reinforced Concrete (UHPFRC), and the effect of the coarse aggregates is reflected in the pressure-compaction relation
UHPFRC developed in this study shows satisfying mechanical properties, complying with the strength requirements of UHPFRC
Summary
The increasing risks of terrorist attacks in the current world clearly show the necessity of improving the impact resistance of important buildings and infrastructures. The advanced mechanical properties [1,2,3] make Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) a promising candidate for these infrastructures. The impact responses of UHPFRC against deformable. ⇑ Corresponding author at: Department of the Built Environment, Eindhoven and non-deformable projectiles were evaluated by Máca et al [4]; the significantly improved resistance of UHPFRC was confirmed in their study and an optimal fiber volume fraction of 2% was obtained. Liu et al [5] analyzed experimentally and numerically the ballistic resistance of UHPFRC, the results of which presented that UHPFRC has advantages regarding the depth of penetration (DOP), crater diameter and volume loss. Yu et al [6] investigated the ballistic performances of UHPFRC against 7.62 mm projectile at 830 m/s, and claimed that the UHPFRC containing hybrid fibers is more efficient than that with only the hooked-end fiber
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