Formation of a bore-center annular shaped charge and its penetration into steel targets

et al. 2020

Def. Sc. Jl.

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Annular shaped charge can efficiently create large penetration diameter, which can solve the problem of small penetration diameter of a traditional shaped charge, and thus meeting the requirements of large penetration diameter in some specific situations. In this paper, the influence of five kinds shell structures, i.e. no shell, aluminum shell with thickness of 2.0 mm and steel shell with thickness of 2.0 mm, 3.0 mm and 4.0 mm, on bore-center annular shaped charges (BCASCs) formation and penetrating steel targets was investigated by numerical simulations and experiments. The numerical simulation results are in good agreement with the experimental results. The results showed that, from no shell to aluminum shell of 2.0 mm and then to steel shell of 2.0 mm, 3.0 mm and 4.0 mm for BCASCs, the diameter and radial velocity of projectile head decrease, the axial velocity of BCASC projectiles increases gradually, the penetration diameter of the targets decreases, and the penetration depth increases. The penetration diameter caused by the BCASC with no shell is the largest, being 116.0 mm (1.16D), D is the charge diameter. The penetration depth caused by the BCASC with steel shell of 4.0 mm thickness is the deepest, being 76.4 mm (0.76D).

“…6). According to the comparison between numerical simulation and X-ray experiments 15 , mesh sizes of 0.4 mm×0.4 mm were used for both Euler and Lagrange model.…”

Section: Numerical Simulations 31 Numerical Methodsmentioning

confidence: 99%

“…In this paper, based on the BCASCs charge structure designed in our previous work 15 , the influence of shell on its forming and penetration into steel target was investigated by combining numerical simulations with penetration experiments.…”

Section: Introductionmentioning

confidence: 99%

Effects of Shell on Bore center Annular Shaped Charges Formation and Penetrating into Steel Targets

et al. 2020

Def. Sc. Jl.

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“…The initial model of a BCASC is shown in Figure . As our previous work , the Euler square mesh size is set to 0.4 mm×0.4 mm. JWL model is used as the equation of state (EoS) for composition B explosive.…”

Section: Numerical Modelsmentioning

confidence: 99%

“…With the increase of the initiation radius, the jet trend to flow inward and form a reconstituted jet. Since the year 2002, our research team has also devoted a large amount of effort to the study of annular shaped charges and its penetration . We have designed many kinds of annular shaped charges, such as W type, bore‐center annular shaped charge (BCASC) and so on, and carried out a set of experiments about the jet formation and its penetration into steel and concrete targets.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Penetration Performance and Optimum Design of a Bore‐Center Annular Shaped Charge

Propellants Explo Pyrotec

et al. 2019

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To improve penetration performance of the classical conical shaped charge, a bore-center annular shaped charge (BCASC) was designed and effects of key parameters on its formation and penetration into concrete targets were investigated numerically and experimentally. As a result, suitable parameters of the BCASC, which comprehensive consideration of penetration hole diameter and depth into concrete targets, were provided. Subsequently, tests of the optimized BCASC penetration into single-layer and doublelayer concrete targets were performed. The results indicate that, for all the cases, the diameters of the rear crater are larger than that of the front ones. The influence of factors h (standoff distance) and f (the radial distance between the center of the inner and outer liner wall) on the diameters of the front crater, the penetrating tunnel, and the rear crater are greater than that of other factors. The diameters of the front crater and the penetrating tunnel decrease with the increase of factors h and f. The penetration depth of optimized BCASC into concrete exceeds 3.0 times of the charge diameter (D). Hole diameters of penetrating tunnels are larger than the charge diameter. For the single-layer concrete target, the hole diameter of the penetrating tunnel is 2.26D. And, for the double-layer concrete target, the hole diameters of the first and second layers are 1.41D and 1.33D, respectively.

Failure analysis of semi-infinite concrete targets subjected to tubular projectiles impact

J Braz. Soc. Mech. Sci. Eng.

et al. 2020

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Improving the penetration efficiency of missiles into concrete is a practical research topic. In this paper, a tubular projectile was designed to enhance penetration diameter on concrete targets. To validate numerical simulation methods, an experiment of an ogive-nosed projectile penetrating a semi-infinite concrete target was reproduced by numerical simulation. Based on the validated numerical model, the penetration progress of a tubular projectile into a semi-infinite concrete target was analyzed. By assessing the penetration tunnel diameter and depth, the effects of key parameters, i.e., the wall thickness (15.0, 30.0, 60.0, 90.0, 120.0 mm) and velocity (400.0, 600.0, 800.0, 1000.0, 1200.0, 1400.0 m/s) of tubular projectile on penetrating concrete targets have been investigated in detail. Furthermore, the penetration performances of flat-nosed projectiles and tubular projectiles on concrete targets with the same mass were compared. The results indicate that with the increase in the wall thickness and velocity of the tubular projectiles, the penetration depth of the projectiles into the concrete target increases gradually, and the increase in the diameter of the tunnel is not obvious. In the case of the wall thickness of the tubular projectile which is greater than or equal to 30.0 mm, the concrete core, near the head of the tubular projectile, is completely fractured and separated from the concrete target. When the flat-nosed projectiles have the same mass and length with tubular projectiles, the diameter of the tunnel caused by the tubular projectile on the concrete targets is always much larger than that caused by the flat-nosed projectiles. The difference of them can be 60.5%. In the condition that the flat-nosed projectiles have the same mass and diameter with tubular projectiles, the depth of the tunnels caused by tubular projectiles in the concrete targets is always much larger than that caused by flat-nosed projectiles. The difference of them can be 95.6%.