Abstract
To investigate the influence of liner material, charge diameter and standoff on explosively formed projectile (EFP) penetrating into multi-layer targets, a large number of experiments were performed and the experimental data on crater diameter, hole diameter, crater depth and penetration depth were obtained. Meanwhile, the numerical simulation have been done to study the formation and penetration processes of all the EFP with AUTODYN software. The numerical results of penetration depth are in good agreement with the experimental ones. The results indicate that the optimal liner material of EFP to achieve a larger penetration hole diameter and depth are aluminum and copper, respectively.
Highlights
The impact resistance of concrete structures is of major importance in engineering application
Using both experiments and numerical simulations, we investigated the variation laws of crater diameter, hole diameter, crater depth and penetration depth with different liner materials, charge diameters and standoffs
Crater diameters formed by explosively formed projectile (EFP) with steel liner increase firstly and decrease with the increase of standoffs; Table 1 illustrate that, when the charge diameters are 100mm and 120mm respectively, the corresponding maximum values of crater diameters are 7.6D and 7.5D; for the same standoff, crater diameter formed by EFP with 120mm diameters are larger than that formed by EFP with 100mm
Summary
The impact resistance of concrete structures is of major importance in engineering application. Experimental and numerical investigations are conducted by Feng et al [11] to study the dynamic response of a double-layered target of ultra-high-performance fibre reinforced concrete and armour steel subjected to an armour-piercing projectile impact. The experimental results indicate that, under high velocity projectile impact, the UHPFRC mixture with hybrid fibres shows a much better energy absorption capacity than the one with hooked steel fibres only, in resisting the scabbing at the rear surface. We carried out a series of experiments of penetrating into multi-layer targets by EFP Using both experiments and numerical simulations, we investigated the variation laws of crater diameter, hole diameter, crater depth and penetration depth with different liner materials, charge diameters and standoffs
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