Abstract
Experiments on penetrating into concrete and pebble layered targets were performed by shaped charge with different cone angles, liner wall thicknesses, length to diameter ratios and charge diameters at different standoffs. Based on the experimental data, the influence of shaped charge’s structural parameters on crater diameter, hole diameter, crater depth and penetration depth was analyzed in detail. Meanwhile, formation and penetration processes of all shaped charges were simulated by AUTODYN software for investigating the more intrinsic mechanisms, in which the numerical models are the same as those set up in the experiments. The results obtained in this paper indicate that there are obvious differences between jetting projectile charge (JPC) and explosively formed projectile (EFP) in penetrating into multi-layer targets. For the same charge diameter, the values of hole diameter formed by EFP were much larger than JPC. However, for the same standoff, the penetration depth caused by JCP were larger than EFP. The interfacial effect exists in the penetration progress of JPC.
Highlights
Shaped charge penetrating into multi-layer targets is a complicated mechanical problem which usually involves shock wave propagation, dynamic behavior of multi-layer targets, interactions between different layers and so on
We carried out a series of experiments on penetrating into multi-layer targets by shaped charge with different cone angles, liner wall thicknesses, length to diameter ratios and charge diameters at different standoffs. Using both experiments and numerical simulations, we investigated the variation laws of crater diameter, hole diameter, crater depth and penetration depth with different geometric configurations of shaped charge and different standoffs
For the same charge diameter, the values of hole diameter formed by explosively formed projectile (EFP) with 150° cone angle were much larger than jetting projectile charge (JPC) with 120° cone angle
Summary
Shaped charge penetrating into multi-layer targets is a complicated mechanical problem which usually involves shock wave propagation, dynamic behavior of multi-layer targets, interactions between different layers and so on. Wang et al presented a calculation formula by modifying the hole enlargement pressure of Szendrei model [8] In recent years, both numerical and experimental techniques have been utilized extensively to investigate concrete penetration [9,10,11]. We carried out a series of experiments on penetrating into multi-layer targets by shaped charge with different cone angles, liner wall thicknesses, length to diameter ratios and charge diameters at different standoffs. Using both experiments and numerical simulations, we investigated the variation laws of crater diameter, hole diameter, crater depth and penetration depth with different geometric configurations of shaped charge and different standoffs
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