scholarly journals Design of a Novel Linear Shaped Charge and Factors Influencing its Penetration Performance

2018 ◽  
Vol 8 (10) ◽  
pp. 1863 ◽  
Author(s):  
Xi Cheng ◽  
Guangyan Huang ◽  
Chunmei Liu ◽  
Shunshan Feng
Keyword(s):  
Structural Design ◽  
Apex Angle ◽  
Shaped Charge ◽  
Jet Formation ◽  
Depth Of Penetration ◽  
Eulerian Model ◽  
Steel Target ◽  
Linear Shaped Charge ◽  
Better Than ◽  
Good Agreement

In this paper, a novel linear shaped charge (LSC), called a bi-apex-angle linear shaped charge (BLSC), has been designed to investigate the improvement of penetration performance. Compared with a traditional single-apex-angle LSC, a BLSC, which consists of a small-apex-angle liner and a large-apex-angle liner, has been investigated by depth-of-penetration (DOP) test. The results show that the penetration depth of BLSC is 29.72% better than that of an ordinary LSC. An Eulerian method is applied to simulate the entire process of jet formation, as well as penetration on a #45 steel target. The effectiveness of the Eulerian model is demonstrated by the good agreement of the computational results with experimental observations. Furthermore, the numerical simulation is developed to investigate the influence of liner thickness, explosive type, combination of small and large apex angle, ratio of small to all apex angle liner, and standoff distance on the penetration performance of BLSCs. The suggested work and results can provide a guide and reference for the structural design of BLSC.

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.

scholarly journals Penetration Evaluation of Explosively Formed Projectiles Through Air and Water Using Insensitive Munition: Simulative and Experimental Studies

2016 ◽  
Vol 6 (1) ◽  
pp. 913-916 ◽  
Author(s):  
M. Ahmed ◽  
A. Q. Malik ◽  
S. A. Rofi ◽  
Z. X. Huang
Keyword(s):  
Formation Flying ◽  
Experimental Studies ◽  
Experimental Results ◽  
Jet Formation ◽  
Depth Of Penetration ◽  
X Ray ◽  
Steel Target ◽  
Great Reliability ◽  
Polymer Bonded Explosives ◽  
The Difference

The process of formation, flying, penetration of explosively-formed projectiles (EFP) and the effect of water on performance of the charge for underwater applications is simulated by Ansysis Autodyn 2D-Hydro code. The main objective of an explosively formed projectile designed for underwater applications is to disintegrate the target at longer standoff distances. In this paper we have simulated the explosively formed projectile from OFHC-Copper liner for 1200 conical angle. The Affect of water on the penetration of EFP is determined by simulations from Ansysis Autodyn 2-D Hydrocode and by varying depth of water from 1CD-5CD. The depth of penetration against steel target is measured experimentally. Flash X-Ray Radiography (FXR) is used to capture EFP jet formation and its penetration against target is measured by depth of penetration experiments. Simulation results are compared with experimental results. The difference in simulated and experimental results for depth of penetration is about 7 mm, which lies within favorable range of error. The jet formation captured from FXR is quite clear and jet velocity determined from Flash X-ray radiography is the same as the ones obtained by using other high explosives. Therefore, it is indicated that Insensitive Munition (8701) can be utilized instead of Polymer Bonded Explosives (PBX) for air and underwater environments with great reliability and without any hazard.

Penetration Performance of Shaped Charge Jets Using Insensitive Munition: Simulative and Experimental Studies

2015 ◽  
Vol 1102 ◽  
pp. 119-123
Author(s):  
Mukhtar Ahmed ◽  
Zheng Xiang Huang ◽  
A.Q. Malik ◽  
Xu Dong Zu ◽  
Qiang Qiang Xiao ◽  
...  
Keyword(s):  
Total Energy ◽  
Experimental Studies ◽  
Shaped Charge ◽  
Experimental Results ◽  
Jet Formation ◽  
Steel Target ◽  
Image Capturing ◽  
Detonation Method ◽  
Simulation Results ◽  
A Charge

The simulation and experimental studies of the Jets obtained from different conical liners from a charge having 56mm-diameter is presented in this paper. An OFHC copper liner of thickness 1 mm and 54 mm-diameters is used for jet formation analysis. Charge ignition is made by using Point detonation method. The simulation results are obtained from Ansysis Autodyn 2-D hydrocode. Experiments are conducted for a charge having 600 conical liner. Flash X-ray Radiography is used for image capturing. The performance capacity of standard shaped charge is predicted by its penetration against steel target. It is observed that kinetic energy of the jet decreases as angle increases, also total energy of the explosive increases and hence the Ratio of the K.E of the jet to the total energy of the explosive decreases as the angle increases. Simulation results are compared with the experimental results. It is observed that simulation results are in favorable agreement within acceptable range of error with the experimental results.

scholarly journals Experimental and Numerical Study on the PG-7VM Warhead Performance against High-Hardness Armor Steel

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3020
Author(s):  
Paweł Żochowski ◽  
Radosław Warchoł ◽  
Maciej Miszczak ◽  
Marcin Nita ◽  
Zygmunt Pankowski ◽  
...  
Keyword(s):  
Numerical Model ◽  
Numerical Study ◽  
High Hardness ◽  
The Body ◽  
Shaped Charge ◽  
Steel Plates ◽  
Technical Documentation ◽  
Jet Formation ◽  
Depth Of Penetration ◽  
Shaped Charge Jet

Analyses presented in the article were carried out in order to characterize the main parameters of the shaped charge jet formed due to detonation of the PG-7VM warhead. As opposed to the previously published studies in which rolled homogeneous armored steel was mainly used as a target, in the current work the warhead penetration capability was determined against more contemporary high-hardness (500 HB) ARMSTAL 30PM steel armor with precisely determined mechanical properties. The research included experimental depth of penetration tests and their numerical reproduction in the LS-Dyna software. Special attention was paid to factors that could perturbate the shaped charge jet formation process and under- or overestimate its penetration capability. For this reason, warheads were X-ray inspected for structural discrepancies (voids or air inclusions in explosive, misalignment between the body, explosive, and liner, or lack of contact between the explosive and the liner) and properties of materials (explosive, targets, and most important warhead components) were analyzed before the experiments. The numerical model of the warhead was defined more accurately than in previously published studies, since it was based on the real grenade dimensions and its technical documentation. Thanks to this, the depth of penetration of the target made of ARMSTAL 30PM armored steel plates by the shaped charge jet formed from the PG-7VM warhead obtained by numerical simulation was consistent with the experimental results and equaled 278 mm and 280 mm, respectively. The difference between the experimental and numerical value was smaller than 1%, which confirms that the developed methodology of modeling allows users to properly reproduce the PG-7VM shaped charge jet formation and target penetration processes. A verified numerical model of the shaped charge jet penetration into a steel target was used to determine depth of penetration in function of stand-off distance for the PG-7VM warhead. A maximum depth of penetration of about 317 mm was obtained for the stand-off distance of 360 mm, which may indicate the potential direction of modernization of warheads.

Numerical Study of Shaped Charge Jet Formation and Penetration into Multi-Layer with Different Liner Material

2010 ◽  
Vol 148-149 ◽  
pp. 744-748 ◽  
Author(s):  
Yan Long Kang ◽  
Jian Wei Jiang ◽  
Shu You Wang ◽  
Jian Bing Men
Keyword(s):  
Titanium Alloy ◽  
Mild Steel ◽  
Numerical Study ◽  
Hole Diameter ◽  
Shaped Charge ◽  
Jet Formation ◽  
Liner Material ◽  
Shaped Charge Jet ◽  
Tip Velocity ◽  
Good Agreement

This paper investigates the penetration performance of shaped charge against multi-layer target. A titanium alloy liner of shaped charge is proposed in order to obtain large perforated hole. Jet formation and penetrating into multi-layer target was calculated by hydro code AUTODYN. For different liner material include titanium alloy, mild steel and Cu, the explosion energy conversion, jet tip velocity and jet length, also the penetration performance are studied. It is found that the kinetic energy of jet is larger and the shape of jet is podgier when the liner material is titanium alloy, the perforated hole diameter on multi-layer improved 20% compare with the mild steel and Cu liner, the numerical simulation is good agreement to experimental results.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

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