scholarly journals Study on the Interference Process of Liquid Radial Reflux on the Stability of a Shaped Charge Jet

2021 ◽  
Vol 11 (17) ◽  
pp. 8044
Author(s):  
Youer Cai ◽  
Xudong Zu ◽  
Yaping Tan ◽  
Zhengxiang Huang
Keyword(s):  
Theoretical Analysis ◽  
Composite Structure ◽  
High Speed ◽  
Side Wall ◽  
Shaped Charge ◽  
Bottom Plate ◽  
Depth Of Penetration ◽  
X Ray ◽  
Shaped Charge Jet ◽  
Filled Composite

The process of liquid radial reflux interference during jet penetration in a liquid-filled composite structure is divided in this study into three stages: bottom plate reflection interference, side-wall reflection interference, and side-wall secondary reflection interference. The calculation model of the velocity interval of the disturbed jet and the residual penetration depth of the jet has been established through theoretical analysis. Results show that the liquid-filled composite structure can interfere with the high-speed section of the shaped charge jet. The accuracy of the theoretical analysis in this paper has been verified through numerical simulation, X-ray, and depth-of-penetration experiments. Among the results, those of the X-ray experiment show that the liquid-filled composite structure has interference on the tip of the shaped charge jet, which provides a possibility for the application of the liquid-filled composite structure to ammunition safety and other extreme cases.

scholarly journals X-ray study of titanium coatings made in shaped charge jet condition

2005 ◽  
Vol 61 (a1) ◽  
pp. c409-c409
Author(s):  
A. Alexeyev ◽  
S. Gromilov ◽  
S. Kinelovsky ◽  
I. Kireenko
Keyword(s):  
Shaped Charge ◽  
X Ray ◽  
Titanium Coatings ◽  
Shaped Charge Jet ◽  
Made In

scholarly journals Study on Penetration Performance of Rear Shaped Charge Warhead

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6526
Author(s):  
Yanan Du ◽  
Guanglin He ◽  
Yukuan Liu ◽  
Zhaoxuan Guo ◽  
Zenghui Qiao
Keyword(s):  
Numerical Simulation ◽  
Experimental Verification ◽  
Simulation Method ◽  
Shaped Charge ◽  
Experimental Results ◽  
Target Plate ◽  
Depth Of Penetration ◽  
Steel Target ◽  
Shaped Charge Jet ◽  
Control Cabin

In guided munitions, the shaped charge jet (SCJ) warhead is located behind the simulation compartment (including the control cabin, the steering gear cabin, and the guidance cabin). Therefore, the order of penetration of the SCJ is the simulation cabin and the target. To study the penetration performance of the SCJ to the target plate, the numerical simulation method is used to study the penetration performance of the designed warhead for the steel target at different standoffs, and the depth of penetration (DOP) at the best standoff is obtained, that is, the DOP of the steel target is about 128 mm. Additionally, the penetration performance of the SCJ warhead to target is studied by numerical simulation and experimental verification. Numerical simulation and experimental results show that the DOP of the SCJ warhead to the steel target is 50 mm without the simulation cabin, and about 30 mm with the simulation cabin. The results show that the penetration performance of SCJ is greatly weakened under the condition of non-optimal standoff, but the rear shaped charge warhead still has a strong penetration performance after completing the penetration of the simulated cabin.

Theoretical analysis of the acceleration effect of the magnetic field on the shaped charge jet

2017 ◽  
Vol 133 ◽  
pp. 283-287 ◽  
Author(s):  
Bin Ma ◽  
Zhengxiang Huang ◽  
Zhongwei Guan ◽  
Xin Jia ◽  
Qiangqiang Xiao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Theoretical Analysis ◽  
Shaped Charge ◽  
Shaped Charge Jet ◽  
The Magnetic Field

FRACTURE PHENOMENA OF BRITTLE MATERIAL AGAINST A SHAPED CHARGE JET

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1475-1482 ◽  
Author(s):  
JOON HONG CHOI ◽  
SOON NAM CHANG
Keyword(s):  
Shock Wave ◽  
Crack Growth ◽  
High Speed ◽  
Slow Crack Growth ◽  
Fused Silica ◽  
Shaped Charge ◽  
Sonic Velocity ◽  
Crystalline Quartz ◽  
Single Crystalline ◽  
Shaped Charge Jet

In order to study the protection behavior of brittle materials against a shaped charge jet, the jet penetration and the fracture behavior have been investigated by the series of photographs taken by the IMACON high speed camera. The examined materials were glass, fused silica, and single crystalline quartz. The trend of crack growth in BK7 glass and fused silica indicated conical shape. In the case of the single crystalline quartz, it was observed that the crack grows fast along the axis of crystal growth. The velocity of shock wave (~ 6km/sec) into glass and fused silica was faster than the sonic velocity. However, the velocity of shock wave in the single crystalline quartz showed to be similar to its sonic velocity. The ballistic protection capability of single crystalline quartz showing fast crack growth has been evaluated to be lower than that of fused silica which has relatively slow crack growth, although the quartz has higher physical and mechanical properties.

scholarly journals Simulating Lateral Drift of a Shaped Charge Jet in ALEGRA

2019 ◽  
Author(s):  
Matthew J. Coppinger ◽  
W. Casey Uhlig ◽  
John H. J. Niederhaus
Keyword(s):  
Velocity Gradient ◽  
Explosive Charge ◽  
Shaped Charge ◽  
Analytical Models ◽  
Depth Of Penetration ◽  
Lateral Drift ◽  
The Difference ◽  
Shaped Charge Jet ◽  
Jet Axis ◽  
Penetration Velocity

Abstract Shaped charge jet (SCJ) research has long been an active area for industrial, academic, and defense organizations. Traditionally, the depth of penetration (DOP) has been one of the most important metrics for the evaluation of shaped charge jet performance, and early 1D analytical penetration models based on hydrodynamic penetration were created with this metric in mind [1]. As the standoff of a shaped charge jet increases, the DOP reaches a maximum and then begins to decrease. A simple 1D hydrodynamic penetration model must account for the totality of the jet material on axis penetrating, and as a result experimental DOP at longer standoffs is lower than the analytical models predicted. Some analytical models reasoned that since a velocity gradient evolves as a SCJ forms, contributions to penetration from jet material below a minimum jet or penetration velocity should be eliminated. These were better able to account for the difference between analytical hydrodynamic and experimental DOPs [2]. The actual difference between analytical hydrodynamic penetration theory and experimentally recorded values is now regarded to be a result of 3D phenomena including particle tumbling and motion transverse to the jet axis known as lateral drift [2]. The origins of these 3D phenomena have been attributed to sources including variability in the uniformity of the explosive charge or the microstructure of the liner [2,3].

Numerical simulations of shaped charge jet penetration into concrete-like targets

2017 ◽  
Vol 8 (2) ◽  
pp. 237-259 ◽  
Author(s):  
Feng Hu ◽  
Hao Wu ◽  
Qin Fang ◽  
Jinchun Liu
Keyword(s):  
Penetration Depth ◽  
Constitutive Models ◽  
Shaped Charge ◽  
Standoff Distance ◽  
Depth Of Penetration ◽  
Whole Process ◽  
Jet Penetration ◽  
Metal Liner ◽  
Shaped Charge Jet ◽  
The Military

Shaped charge jet has been widely applied in the military and energy sources’ extraction fields; while the related investigations on the shaped charge jet penetration into concrete-like target are still limited, a series of numerical simulation works are conducted in this article. Holmquist–Johnson–Cook and Johnson–Cook models are used to describe the concrete-like targets and metal liner/casing of the shaped charge, respectively. The whole process including the formation, elongation in the air, and penetration into concrete-like target of shaped charge jet is reproduced using the multi-material arbitrary Lagrange–Euler algorithm and fluid–structure interaction method implemented in LS-DYNA. Simultaneously, the striking velocities of the jet (both tip and tail) and the damage of target (diameter and depth of penetration borehole) are derived. The above constitutive models, the corresponding material parameters, and the finite element algorithms are validated by comparing with the available tests’ data. The analyses of parametric influences are further performed. It indicates that for the unfragmented shaped charge jet, the penetration depth increases and the average penetration borehole diameter decreases with the standoff distance increasing, respectively; the compressive strength of concrete target has slight influence on the penetration depth of shaped charge jet; the diameter of shaped charge jet penetration borehole with aluminum liner is larger, while that with copper liner has a deeper penetration depth. It can also be found that the influence of explosive type on the penetration performance of shaped charge jet is negligible at small standoff distance, while the explosive LX-14 performs better than explosives Octol, B, and 8701 at larger standoff distance.

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