Double Shock Initiation of the HMX Based Explosive EDC-37

Gustavsen, R. L.; Sheffield, S. A.; Alcon, R. R.; Winter, R. E.; Taylor, Peter C.; Salisbury, D. A.

doi:10.1063/1.1483706

Cited by 21 publications

(8 citation statements)

References 2 publications

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“…After implementation in LS DYNA, this model is available to study a variety of problems involving explosives, especially desensitization by pre-shocking. Our model qualitatively reproduces the experimental results of EDC37 double shock experiments [12,13]. The simulation results presented here successfully reproduce the main features of the desensitization of heterogeneous explosives by double shock, reflected shock and detonation quenching processes respectively, and provide qualitative agreement with the experimental results.…”

Section: Discussionsupporting

confidence: 78%

“…This feature helped us to reproduce the experimental results of the EDC37 double shock experiments [12,13], as will be described in the next section.…”

Section: The Present Approachmentioning

confidence: 76%

“…The parameter set for the Lee-Tarver model of PBX-9404 with a two-term reaction rate equation was taken from LLNL report [38] and is reproduced in Table 1. [12,13] respectively). The comparison between the presently calculated and the experimental run distance to detonation for the three experimental shots is given in Table 2 below.…”

Section: Simulation Of Double Shock Experimentsmentioning

confidence: 98%

“…A series of double shock initiation experiments [12,13] on an HMX-based explosive EDC37 (91% HMX and 9% binder) revealed more interesting facts. In the first set of experiments (experimental shots 1175/1176), the explosive was subjected to a 2.87 GPa shock followed by a 6.2 GPa shock.…”

Section: Experimental Evidencementioning

confidence: 99%

“…The pressure history was measured at various gauge points inside the explosive; the gauges were 0.5 mm apart. The series of double shock initiation experiments [12,13] on an HMX based explosive EDC37 was chosen for the simulation and validation of the newly implemented model, because these experiments reveal a broader range of features involved in the shock desensitization process of an explosive. Figures 10 and 11 in reference [13] are experimental particle velocity histories at different gauge positions inside the EDC37 explosive for shots 1175/76 and shots 1191/92 respectively.…”

Section: Simulation Of Double Shock Experimentsmentioning

confidence: 99%

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Desensitization by Pre-shocking in Heterogeneous Explosives and its Numerical Modelling

Hussain¹,

Liu²,

Huang³

et al. 2016

Cent. Eur. J. Energ. Mater.

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Abstract:Desensitization caused by pre-shocking in heterogeneous explosives is discussed. The aim of this study was to find a simple numerical model that could reproduce the important features of previously reported shock desensitization experiments. After reviewing the previous experimental results and modelling efforts, an extension of the Lee-Tarver reactive flow model is proposed. The proposed desensitization model is based upon the experimentally determined desensitization criteria for explosives. The additional parameters required for this extension can be calibrated by experiment for a typical explosive. The new model has been implemented in the hydrodynamic code LS-DYNA as a user defined equation of state, and is now available to simulate various kinds of situations involving explosives up to the limits and capabilities of LS-DYNA. Desensitization by pre-shocking in double shock experiments, reflected shock and detonation quenching experiments have been studied using the new model, and the results were found to be in qualitative agreement with the experimental results reported in the literature.

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Section: Discussionsupporting

confidence: 78%

“…This feature helped us to reproduce the experimental results of the EDC37 double shock experiments [12,13], as will be described in the next section.…”

Section: The Present Approachmentioning

confidence: 76%

Section: Simulation Of Double Shock Experimentsmentioning

confidence: 98%

Section: Experimental Evidencementioning

confidence: 99%

Section: Simulation Of Double Shock Experimentsmentioning

confidence: 99%

See 3 more Smart Citations

Desensitization by Pre-shocking in Heterogeneous Explosives and its Numerical Modelling

Hussain¹,

Liu²,

Huang³

et al. 2016

Cent. Eur. J. Energ. Mater.

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Shock Desensitization Effect in the Confined Explosive Component Water Gap Test Defined by the NATO Standardization Agreement (STANAG) 4363

Lefrançois

Lee

Tarver

2007

Propellants Explo Pyrotec

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In an effort to extend the modified explosive component water gap test [1 -3] defined by the NATO standardization agreement (STANAG) 4363, several countries have investigated the shock sensitiveness of confined lead and booster components having a diameter less than 5 mm [4 -8]. A pentaerythritol tetranitrate (PETN) based acceptor pellet is chosen as a reference with a height and diameter of 3 mm. The height of the steel confinement is equal to the one of the HE pellet and the wall thickness varies. A 1-mm thick wall makes the component more sensitive (larger water gap). As the wall thickness is increased to 2-mm, the gap increases a lesser amount. A decrease in sensitivity is observed with a 3.5 mm thick wall (smaller water gap). This decrease of the water gap has been reproduced experimentally. This unusual behavior remains puzzling and does not allow the test to be extended for small components. This work presents the numerical simulations performed with LS-Dyna in 2D axi-symmetrical and 3D wedge configurations, using an ignition and growth model [9] for LX-16 (96% PETN, 4% FPC 461) in order to evaluate the shock sensitiveness for a confined HE acceptor.

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Air Gaps, Size Effect, and Corner‐Turning in Ambient LX‐17

Souers

Hernandez

Cabacungan

et al. 2009

Propellants Explo Pyrotec

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Various measurements under ambient conditions are presented for LX-17. The size (diameter) effect has been measured with copper and Lucite confinement, where the failure radii are 4.0 and 6.5 mm, respectively. The air well corner-turning has been measured with an LX-07 booster, and the dead-zone results are comparable to the previous TATB-boosted work. Four double cylinders have been fired, and dead zones appear in all cases. The steel-backed samples are faster than the Lucite-backed samples by 0.6 ms. Bare LX-07 and LX-17 charges of 12.7 mm radius were fired with air gaps. Long acceptor regions were used to truly determine if detonation occurred or not. The LX-07 booster crossed a 10 mm gap with a slight time delay. Steady-state LX-17 crossed a 3.5 mm gap but failed to cross a 4.0 mm gap. LX-17 charge with a 12.7 mm radius run after the booster crossed a 1.5 mm gap but failed to cross a 2.5 mm gap. Timing delays were measured where the detonation crossed the gaps. The Tarantula model is introduced as embedded in reactive flow JWL þ þ and Linked Cheetah V4, mostly at 4 zones mm À1 . Tarantula has four pressure regions: off, initiation, failure, and detonation. The physical basis of the input parameters is considered.

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Double Shock Initiation of the HMX Based Explosive EDC-37

Cited by 21 publications

References 2 publications

Desensitization by Pre-shocking in Heterogeneous Explosives and its Numerical Modelling

Desensitization by Pre-shocking in Heterogeneous Explosives and its Numerical Modelling

Shock Desensitization Effect in the Confined Explosive Component Water Gap Test Defined by the NATO Standardization Agreement (STANAG) 4363

Air Gaps, Size Effect, and Corner‐Turning in Ambient LX‐17

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