A Formula for the Shaped Charge Jet Breakup-Time

1979 ◽  
Vol 4 (5) ◽  
pp. 89-94 ◽  
Author(s):  
E. Hirsch
Keyword(s):  
Shaped Charge ◽  
Jet Breakup ◽  
Shaped Charge Jet ◽  
Breakup Time

An Empirical Shaped Charge Jet Breakup Model

2014 ◽  
Author(s):  
Ernest L. Baker ◽  
James Pham ◽  
Tan Vuong
Keyword(s):  
Shaped Charge ◽  
Jet Breakup ◽  
Shaped Charge Jet ◽  
Breakup Model

Autodyn-2D Simulation of Shaped Charge Jet Formation and Penetration Mechanism into Multi-Layered Shielded Target

2014 ◽  
Vol 664 ◽  
pp. 128-137
Author(s):  
Kamal Guendouz ◽  
Ayoub Sayhi ◽  
Wang Cheng
Keyword(s):  
Shell Thickness ◽  
Alpha Angle ◽  
Shaped Charge ◽  
Jet Formation ◽  
Liner Material ◽  
2D Simulation ◽  
Jet Breakup ◽  
Jet Penetration ◽  
Jet Velocity ◽  
Shaped Charge Jet

In this work, the shaped charge jet formation depends on different parameters which can has effect on jet behavior such as jet velocity, breakup and penetration. Jet radius or liner thickness, shell thickness, liner material density, α angle and stand-off distance are evaluated in purpose to investigate their effect on performance of shaped charge jet velocity and jet breakup phenomena, also we investigate the effect of stand-off distance on shaped charge jet penetration into steel target. We also studied the performance of some protective shields materials in order to assure more protection for vehicle structure against shaped charge jet penetration. For that, different materials were used as armors such as: kevlar epoxy, polyethylene, glass epoxy, steel-1006 and Al2O3 ceramic. These protective shields were evaluated in order to show their performance against shaped charge penetration into target. To do so, adopted explicit dynamic analyzing program Autodyn basing on finite element were used to simulate shaped charge jet formation and penetration. Autodyn-2D simulationshighlight the efficiency of our work comparing with the experiments done in literature and Birkhoff’s theory. In other terms, increasing in shell thickness, alpha angle and liner densityenhance jet breakup time, protective shields layered armor of steel-1006, steel 1006 with polyethylene and steel-1006 with Al2O3ceramic give more protection for structure against shaped charge jet penetration comparing with others armors.

Calculation of jet characteristics from hydrocode analysis

2019 ◽  
Author(s):  
Justin C. Sweitzer ◽  
Nicholas Peterson ◽  
Scott Hill
Keyword(s):  
System Integration ◽  
Shaped Charge ◽  
Physical Parameters ◽  
Stretch Rate ◽  
Time Calculation ◽  
Semi Empirical ◽  
Analytic Models ◽  
Shaped Charge Jet ◽  
Jet Characteristics ◽  
Breakup Time

Abstract The penetration performance of a shaped charge jet is affected strongly by factors such as straightness, stretch rate, and breakup time. Straightness is related to manufacturing tolerances, assembly techniques, and system integration features. Stretch rate and breakup time are controllable features of charge design. A higher stretch rate is desirable for short standoff performance. The stretch rate is easily altered by a change of explosive or modification of the angle with which the detonation wave sweeps the liner surface, however, an increased stretch rate generally results in a decreased breakup time. Many of the recent gains in shaped charge performance have been made possible by increasing the effective breakup time of the jet. Several models exist for calculating breakup time. They include analytic models, such as Chou & Carleone’s dimensionless strain rate model, and empirical or semi-empirical models such as Walsh’s theory and those proposed by Pearson, et al. These models can be applied to raw hydrocode calculation data and used to determine a Jet Characterization (JC) file. The JC file can then be used to perform further calculations, such as Penetration Versus Stand Off (PVSO) curves. This paper details adaptation of the Chou & Carleone model for predicting breakup time using hydrocode data. The hydrocode is used to determine the physical parameters of the jet which are then extrapolated back to a virtual origin for breakup time calculation. This results in a model that is design independent, relying on hydrocode determination of jet variables. The model implementation will be discussed, and comparisons of predicted jet characteristics will be made to test data for several charge geometries.

Experimental Evidence For Sulfur Induced Loss Of Ductility In Copper Shaped-Charge Jets

1995 ◽  
Vol 409 ◽  
Author(s):  
D. K. Chan ◽  
D. H. Lassila ◽  
W. E. King ◽  
E. L. Baker
Keyword(s):  
Grain Boundaries ◽  
Sulfur Content ◽  
Fracture Behavior ◽  
High Strain ◽  
Shaped Charge ◽  
X Ray ◽  
Jet Breakup ◽  
Deformation And Fracture ◽  
Breakup Time ◽  
Content Of Oxygen

AbstractWe have observed that a change in the bulk sulfur content of oxygen-free electronic copper markedly affects its high temperature (400–1000°C), high strain-rate (> 103 s−1) deformation and fracture behavior. These conditions are typical of those found in "jets" formed from the explosive deformation of copper shaped-charge liners. Specifically, an increase in the bulk sulfur concentration from 4 ppm to 8 ppm shortens the breakup time, tb, of the copper jets by nearly 20% as measured using flash x-ray radiographs recorded during breakup of the jets. At bulk concentrations of 4 ppm, the jet was observed to be uniform and axisymmetric with a breakup time of 186 µs. Jet particles exhibited length-to-diameter ratios of roughly 8:1. The addition of sulfur transformed the jet breakup behavior to non-uniform, non-axisymmetric rupture and reduced the breakup time to 147 µs. The length-to-diameter ratios decreased to roughly 5:1 in the sulfurdoped samples. Previously measured sulfur solubilities and diffusivities in copper at the temperatures where this material was processed indicates nearly all of the sulfur was localized to grain boundaries. Therefore, we infer that the increase in sulfur content at grain boundaries is directly responsible for the change in breakup performance of the shaped-charge jets.

scholarly journals A new 3D computational model for shaped charge jet breakup

1996 ◽  
Author(s):  
L. Zernow ◽  
E.J. Chapyak ◽  
S.J. Mosso
Keyword(s):  
Computational Model ◽  
Shaped Charge ◽  
Jet Breakup ◽  
Shaped Charge Jet

Breakup Time of Zirconium Shaped Charge Jet

2013 ◽  
Vol 38 (5) ◽  
pp. 703-708 ◽  
Author(s):  
T. Elshenawy ◽  
Qing Ming Li
Keyword(s):  
Shaped Charge ◽  
Shaped Charge Jet ◽  
Breakup Time

Theoretical and experimental study on the effect of the external strong magnetic field on the shaped charge jet

2017 ◽  
Vol 31 (03) ◽  
pp. 1750018 ◽  
Author(s):  
B. Ma ◽  
Z. X. Huang ◽  
X. D. Zu ◽  
Q. Q. Xiao ◽  
X. Jia
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Strong Magnetic Field ◽  
Shaped Charge ◽  
Coupling Mechanism ◽  
Field Coupling ◽  
Magnetic Field Coupling ◽  
Shaped Charge Jet ◽  
Breakup Time ◽  
The Magnetic Field

The external strong magnetic field coupling with shaped charge is an effectively method to increase the penetration capability of the shaped charge jet. In this study, a theoretical model was developed to analyze the effect of the external strong magnetic field on breakup time and inhibition of rotation and drift of the shaped charge jet. The discharge current of the circuit system and the magnetic field of the shaped charge jet undergoing were calculated in detail. A series of depth of penetration (DOP) experiments were conducted to analyze the coupling mechanism between the external magnetic field and the shaped charge jet. Theoretical and experimental results indicated that the external strong magnetic field coupling with shaped charge jet can effectively improve the stability of the shaped charge jet, which the magnetic field can delay its breakup time and inhibit its rotation and drift. The ability of penetration of the jet produced by the Ø56 mm shaped charge is increased by 69.13% under the action of the external magnetic field.

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