Analysis on shock attenuation in gap test configuration for characterizing energetic materials

Kim, Bohoon; Park, Jungsu; Yoh, Jack J.

doi:10.1063/1.4945777

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…The PMMA thickness is increased incrementally using additional layers (disc) until the acceptor failure is witnessed with a probability of 50%. 5 The critical gap thickness for each explosive and the corresponding shock pressure are shown in Table II. The gap thickness increased with increasing the percentage of basic explosive.…”

Section: B Large-scale Gap Testmentioning

confidence: 99%

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Modeling the effects of aluminum and ammonium perchlorate addition on the detonation of the high explosives C4H8O8N8 (HMX) and C3H6O6N6 (RDX)

Baek

Kim

Yoh

2018

Journal of Applied Physics

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Metalized high explosives effectively tailor the explosion impulse at lowered detonation pressures of common high performance explosives such as C 3 H 6 O 6 N 6 (RDX) and C 4 H 8 O 8 N 8 (HMX). The presence of aluminum (Al) with and without ammonium perchlorate (AP) allows the subsequent burning for longer and sustained reactions of enhanced blast explosives. The modeling of reaction rate laws for three explosives with varied amounts of Al, AP, RDX, and HMX is reported. The model validation included the rate stick test for understanding the explosive reaction of the three samples and the large-scale gap test for determining their ignition sensitivity. The experimental results confirmed the accuracy of the model in simulating the shock sensitivity and the size effects before detonation failure. The effect of enhanced blast of these explosives in the presence of Al and AP is also reported.

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Section: B Large-scale Gap Testmentioning

confidence: 99%

“…As the Al content increased, the detonation velocity clearly declined, and the double peak due to the subsequent reaction of Al was observed in the numerical simulations. A modified reaction model 4,5 was used to determine the rate parameters of 50% RDX and was verified by the unconfined rate stick and gap tests.…”

Section: Introductionmentioning

confidence: 99%

Modeling the effects of aluminum and ammonium perchlorate addition on the detonation of the high explosives C4H8O8N8 (HMX) and C3H6O6N6 (RDX)

Baek

Kim

Yoh

2018

Journal of Applied Physics

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“…The more practical way to understand shock sensitivity of an explosive may be to calibrate a reaction rate model based on hydrodynamics theories by using experimental data collected in the shock initiation or detonation regime [7][8][9]. Such rate can be applied to model shock initiation applications, and may provide with useful information which cannot be obtained from experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Shock Initiation of a HNIW‐Based Explosive

Lee

Hwang

et al. 2020

Propellants Explo Pyrotec

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To investigate shock-to-detonation transition (SDT) characteristics of a HNIW-based explosive, a rate law based on the Forest Fire model was calibrated by conducting five wedge tests. In the wedge tests, initial shock pressure at wedge-shaped test explosive charges was varied from 5 to 11 GPa. In each test, the shock trajectory along the wedge-shaped explosive charge was recorded with a streak camera. The streak records showed that sharp SDT occurred in the test explosive. The shock Hugoniot of the test explosive was determined from the free-surface velocity of PMMA attenuators measured with a VISAR instrument and the early shock velocity in the wedges, determined from the shock trajectories. The Pop plot for the test explosive was obtained from run distances to detonation esti-mated based on the shock trajectories. The Forest Fire rate of the test explosive was calibrated from the experimental Hugoniot and the Pop plot. The wedge tests were numerically simulated with the calibrated rate by using a one-dimensional Lagrangian hydrodynamic code. The calculated shock trajectories closely reproduced experimental observations. The rate was further applied to two-dimensional numerical simulations of large-scale gap tests (LSGTs). The estimated critical gap thickness by the LSGT simulations was 43.7 mm, which was in good agreement with experimental data of 46.67 mm. The results of these two types of numerical simulations suggested that the calibrated rate could be used to model most SDT-related applications.

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“…Lan et al [3] conducted a two-dimensional Lagrangian computational fluid dynamics program to simulate detonation wave propagation in PMMA. Kim et al [4] defined a multi-material hydrodynamic simulation for LSCT to provide the detonation characteristics of high explosives in contact with a PMMA gap. Qin et al [5] use LS-DYNA software to simulate the shock wave effect to evaluate flashing detonation grenade non-lethal effect.…”

Section: Introductionmentioning

confidence: 99%

Comparison between some materials composites in the shock wave attenuation and anti-detonation property

Fan

Wang

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Comparing the anti-detonation property and shock wave attenuation law of the single material structures, composite material structures and sandwich material structures are simulated by AUTODYN. The simulation on the structures with different combination show that, the aramid fiber material as base material in touched with the explosives, can greatly reduce the shock wave in identification board. For different material structures of the attenuation rule of shock wave, numerical simulation results show that the sandwich structure of the shock wave attenuation ability is more effectively than a single material structure. Based on the anti-detonation performance in different arrangement of the material structure, antidetonation structure optimization design scheme is given according to the simulation results.

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Analysis on shock attenuation in gap test configuration for characterizing energetic materials

Cited by 10 publications

References 22 publications

Modeling the effects of aluminum and ammonium perchlorate addition on the detonation of the high explosives C4H8O8N8 (HMX) and C3H6O6N6 (RDX)

Modeling the effects of aluminum and ammonium perchlorate addition on the detonation of the high explosives C4H8O8N8 (HMX) and C3H6O6N6 (RDX)

Numerical Modelling of Shock Initiation of a HNIW‐Based Explosive

Comparison between some materials composites in the shock wave attenuation and anti-detonation property

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