High Explosive Initiation Behavior by Shaped Charge Jet Impacts

Arnold, Werner; Rottenkolber, Ernst

doi:10.1016/j.proeng.2013.05.022

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…This caused extended run distances, which is consistent with the experiments conducted by James et al [14]. They found that cover materials [15,16] also influenced impact and bow-wave initiation, and the jet-tip shape only affected the impact initiation [17]. These studies have focused on the jet-initiating mechanism and law at ambient temperature; however, little investigation has been conducted into jet-initiating explosives at high temperature.…”

Section: Introductionsupporting

confidence: 80%

Shaped‐Charge Jet‐Initiation of Covered RDX‐Based Aluminized Explosives and Effect of Temperature

Chen

Yang

et al. 2020

Propellants Explo Pyrotec

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Understanding the shaped‐charge jet‐initiation mechanism of covered explosives and the effect of explosive temperature is important for ammunition safety. We devised a method of using a shaped‐charge jet‐penetrating cover to shock‐initiate heated explosives. This method achieves uniform temperature control of explosives via heating the upper and lower ends and preserves heat on the side of the explosive charge. We experimentally tested the method on hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX)‐based aluminized explosives (61 wt.% RDX, 30 wt.% Al, 9 wt.% binder) at different temperatures and cover thicknesses. The jet‐penetration behavior and explosive detonation‐wave growth were observed via X‐ray photography, and the effect of explosive temperature on jet initiation was analyzed. A numerical model of the shaped‐charge jet‐initiating explosive was set up by considering the temperature change of the explosive and analyzing the detonation‐wave growth and initiation thresholds of different explosive temperatures under jet shock initiation. Under a thin cover, the explosive showed prompt impact initiation by the jet; the initiation occurred very near to the explosive surface. However, for a thick cover, the explosion was initiated by a bow wave formed at a certain distance from the upper surface of the explosive, and a retonation wave was observed. The temperature of RDX‐based aluminized explosives affects the two jet‐initiation mechanisms. The shock sensitivity of the explosives to the jet decreased with increasing temperature, but the shock sensitivity increased when the temperature exceeded a certain value. A simulation method was established that can be used to predict shaped‐charge jet initiation at different explosive temperatures. We obtained the relationship between the cover thickness and run‐to‐detonation distance under jet shock initiation, which provides a theoretical basis for safety analysis and evaluation of a warhead charge that is attacked by a shaped‐charge jet.

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Section: Introductionsupporting

confidence: 80%

Shaped‐Charge Jet‐Initiation of Covered RDX‐Based Aluminized Explosives and Effect of Temperature

Chen

Yang

et al. 2020

Propellants Explo Pyrotec

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“…By substituting and integrating Equations (15)(16)(17)(18)(19) into Equation ( 14), the dynamic term is obtained as…”

Section: Materials Flow In Cover Platementioning

confidence: 99%

“…The criterion is suitable for the low and intermediate impact velocity ranges and larger diameter jets. Ar-nold [17][18] proposed a new critical initiation criterion based on the simulation and experimental results of jets and projectiles with different diameters.…”

Section: Introductionmentioning

confidence: 99%

Critical Initiation Threshold of Covered Finite Thickness Explosive under Impact of Shaped Charge Jet

Chen

Jia

Xia

et al. 2021

Propellants Explo Pyrotec

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The compression depth of explosives is obtained on the basis of Lee penetration equation and the upper bound method to analyze the critical initiation threshold of finite thickness explosives. According to the pop curve, a theoretical model that reflects the relationship between critical initiation threshold and explosive thickness is established. Numerical simulation was carried out to simulate the initiation process and initiation threshold of explosives with different cover plate thicknesses. At the same time, we combine with the experimental data, to compare with the theoretical results. The calculations are in good agreement with data. Results show that the height of the bulge on the back of the cover plate and the compression depth of the explosive gradually increase with the thickness of the cover plate. When the cover plate reaches a certain thickness, there is no significant change on the final height of the bulge and the compression depth of the explosive. The decrease in explosive thickness increases the critical initiation threshold value, and the logarithm of the critical initiation threshold of the finite thickness explosive is approximately linearly related to the logarithm of the explosive thickness minus the compression depth. Therefore, this study can provide a reference for the initiation and simple calculation of the critical threshold of finite thickness explosives.

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“…After initiation, the cuneiform-shaped charge liner constantly collapses to form a jet knife of high energy and high velocity under the impact of detonation waves. Due to the cuneiform structure, the cover must be thin-walled and the cavity must be big to guarantee the energy concentration, and the cover with variable wall thickness, which is thin at the top and thick at the bottom, is commonly applied to produce big velocity gradient and prolong the process of jet stretch with the formation of a high-speed tip jet and a slow-speed rear jet [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of the formation and penetration of an LSC jet in different initiation manners

Sun

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The formation and influence of initiation manners on a linear-shaped charge (LSC) jet were studied through experimentation and numerical simulation. An X-ray was adopted to observe the formation process of LSC jet, and simultaneous axial stretch and edge expansion were observed in the formation. The cause of the end effect, and the influence of single end point initiation, central point initiation, two end point initiation, and time difference were discussed. Numerical simulation indicated that the end effect was caused by a combination of jet expansion in the edge direction and the "erosion" of end rarefaction waves, which could be eliminated by increasing the charge length. The jet initiated via single-point initiation produced the highest expansion velocity at the detonation termination end, and the jet initiated in two-point initiation produced the highest jet tip velocity. The initial spherical wave of central-point initiation had the effect of energy accumulation similar to conical charge, and the central jet exhibited high jet tip velocity. Central-point initiation is the most powerful in terms of general penetration ability. The penetration performance of the jet with time difference initially decreased and then increased with increasing Δt and when the general deflection was the smallest, the crack was the most symmetric.

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High Explosive Initiation Behavior by Shaped Charge Jet Impacts

Cited by 16 publications

References 5 publications

Shaped‐Charge Jet‐Initiation of Covered RDX‐Based Aluminized Explosives and Effect of Temperature

Shaped‐Charge Jet‐Initiation of Covered RDX‐Based Aluminized Explosives and Effect of Temperature

Critical Initiation Threshold of Covered Finite Thickness Explosive under Impact of Shaped Charge Jet

Numerical and experimental study of the formation and penetration of an LSC jet in different initiation manners

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