Theoretical and experimental study of shaped charge jet penetration into high and Ultra-high strength concrete targets

et al. 2020

Materials

In an aeroengine casing containment experiment, in order to explode and separate unidirectional carbon fiber reinforced epoxy resin-based laminate, with uneven thickness, without excessive residual speed and fragment spattering, blades were subjected to three types of blasting and cutting pretests, including normal and lateral opening charge explosive tests on the laminate and linear charge-shaped jet cutting. The linear charge-shaped method was found to be the most suitable method for separating the laminate. The finite-element analysis program AUTODYN was used to simulate and optimize the effect of shaped jet cutting. When the explosive height of the shaped jet cutter was set to 90 mm, the laminate broke with the least number of fragments and the residual velocity of the plate was the smallest. At this time, we obtained the relationship between the total amount of explosive and the thickness of the composite plate when the composite plates of different thicknesses were just broken, and the rationality of the relationship was verified by experiments. The research method, in this paper, provides a reference scheme to design explosive separation composite materials in complex engineering environments.

Section: Establishment Of Model To Explore the Best Explosion Heightmentioning

confidence: 99%

Section: Establishment Of Model To Explore the Best Explosion Heightmentioning

confidence: 99%

Section: Experimental Verificationmentioning

confidence: 99%

See 1 more Smart Citation

A Study on Explosion Separation Technology of Carbon Fiber Reinforced Epoxy Resin-Based Composite Laminate

et al. 2020

Materials

“…Because of its low cost, easy available and good protective performance, concrete materials are widely used in various structures, such as civilian buildings, bridges, hydraulic engineering, airports, command bunkers and hardened shelters [1][2][3]. In recent years, with the increase in thickness of concrete protection engineering and development of various novel ultra-high performance concretes [4][5][6], a conventional anti-hard target warhead, shaped charge (SC), may not be effective against concrete targets.…”

Section: Introductionmentioning

confidence: 99%

Penetration of a hypervelocity shaped charge into layered and spaced concrete targets

J Braz. Soc. Mech. Sci. Eng.

Yuan

et al. 2020

With the increase in the concrete thickness for protection engineering and the development of various novel concrete structures, as an important anti-hard target warhead, the conventional conical shaped charge (CSC) may not be effective against concrete targets. To increase the penetration depth of the CSC on concrete targets, a comparative study between hypervelocity shaped charge (HSC) and CSC into concrete layered and spaced targets were performed at different standoff distances. Furthermore, the effect of the thickness of the tungsten slab on the formation of HSC was investigated by simulations and experiments. The results indicated that, as the thickness (K) of the tungsten slab increases from 2.5 to 10.0 mm, the velocity of the projectile formed by HSC first increases and then decreases. A similar trend was observed for the penetration depth of HSC into the layered concrete targets. The penetration depth of layered targets caused by HSC with K = 7.5 mm increased by 31.3% than that formed by CSC.

“…In order to improve the penetration performance on hard targets, a large number of scholars have studied the effects of liner materials and structures of shaped charge . In the research of liner materials, reactive materials have been widely concerned since it can release chemical energy again after penetrating target and increase the penetration hole diameter.…”

Section: Introductionmentioning

confidence: 99%

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

Propellants Explo Pyrotec

Yuan

et al. 2019

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.