High explosive corner turning performance and the LANL mushroom test

Hill, Larry; Seitz, W.L.; Forest, C.A.; Harry, Herbert H.

doi:10.1063/1.55675

Cited by 6 publications

(3 citation statements)

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“…Under specific conditions, detonation can be reformed again. However, when the energy of the diffraction detonation wave is inadequate to initiate detonation, it acts as a preloading effect on the explosive, and reduces the sensitivity of the explosive due to the density increase in the unexploded area, the so-called "dead zone" [21,27,28]. Based on this idea, we designed an explosive circuit with multiple 90°angles.…”

Section: Full Papermentioning

confidence: 99%

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Peng

et al. 2019

Propellants Explo Pyrotec

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Explosive ink in the micro-size charges of explosive circuits for energetic devices has attracted considerable interest. Herein, explosive ink with 90 wt.% of energetic solid was selected by testing the rheological properties of formulations with different CL-20 concentrations. Explosive ink suspensions with sub-micro 4,6,8,10,4,6,8,10, as main explosive and fluorine-containing rubber/polyvinyl alcohol (PVA) emulsion as binder system were prepared. Direct ink writing (DIW) technology was used for the printing of the sample and for the loading of the explosive ink in a micro-size groove. The morphology and crystal type of the CL-20-based composite samples were characterized by SEM and XRD, and its detonating transfer performance in the micro-size groove were tested. Results show that the CL-20based composite has a good molding effect, and the crystal type has not changed. The critical detonation thickness is around 11 μm at 1.0 mm fixed width in the wedge tests, and the critical detonation size (cross section) is about 0.3 mm × 0.3 mm. The detonation wave could continue to propagate around multiple 90°corners. The maximum corner turning ability of the detonation wave is 140°and the CL-20-based composite can detonate completely in a complex charge circuit.Keywords: CL-20 · explosive ink · detonating transfer performance · corner turning ability · micro-size detonation Figure 6. (a) Optical image of explosive circuit charges with multiple 90°corner before detonation; (b) Optical image of charge substrate after detonation.

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Section: Full Papermentioning

confidence: 99%

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Peng

et al. 2019

Propellants Explo Pyrotec

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“…This is relevant to detonator/booster applications, and to some accident scenarios involving a projectile impacting an HE. Several types of experiments provide data on this phenomena; such as the mushroom test [Hill et al, 1997], hockey puck test [Souers et al, 2006] and onionskin/furball test [Francois et al, 2014].…”

Section: Final Remarksmentioning

confidence: 99%

Shock-to-Detonation Transition simulations

Menikoff

2015

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Shock-to-detonation transition (SDT) experiments with embedded velocity gauges provide data that can be used for both calibration and validation of high explosive (HE) burn models. Typically, a series of experiments is performed for each HE in which the initial shock pressure is varied. Here we describe a methodology for automating a series of SDT simulations and comparing numerical tracer particle velocities with the experimental gauge data. Illustrative examples are shown for PBX 9502 using the HE models implemented in the xRage ASC code at LANL.

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“…One of the standard double-cylinder tests is S-COT (or, Pantex corner-turning test) [22]; a more recent version, requiring less HE, is known as ECOT [23]. In a similar class of experiments, the second (larger) cylinder is replaced with a hemisphere, making a composite object that is roughly mushroom-shaped [24]; in the case of the recentlydeveloped test SAX [25] first constructed at LLNL, the hemisphere of HE is capped by a thin witness shell of metal for photon Doppler velocimetry (PDV) probes.…”

Section: Introductionmentioning

confidence: 99%

A Simple Reactive‐Flow Model for Corner‐Turning in Insensitive High Explosives, Including Failure and Dead Zones. I. The Model.

Williams

2020

Propellants Explo Pyrotec

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I report on a novel simple reactive-flow model that captures corner-turning behavior, including failure and the creation of dead zones, in insensitive solid heterogeneous high explosives. The model is fast, has a minimum of free parameters, and is physically grounded in the underlying initiation and burn phenomena. The focus of the model is explosives based on triaminotrinitrobenzene (TATB), although the model is quite general. I initially developed the model and integrated it into a branch of a Lawrence Livermore National Laboratory (LLNL) arbitrary Lagrangian-Eulerian (ALE) code concurrently with other modelling efforts of mine, but I subsequently adopted it to study corner-turning behavior in the TATB-based high explosive PBX 9502 when two other available models suggested to me proved inadequate, being either prohibitively computationally expensive or numerically unstable. An early version of the model reproduces corner-turning behavior in two different double-cylinder tests and a mushroomtype corner turning test. The model was informed and influenced by other reactive-flow models applicable to shock initiation or corner-turning, most especially including JWL++ Tarantula 2011 and an in-house piecewise-linear CHEETAH-based model that exhibits corner-turning behavior, but also, to a degree, by Ignition & Growth (I&G), CREST, and the Statistical Hot-Spot Model. The model also shares some similarities to SURF models. In this paper, I describe the model and its theoretical development as I originally conceived it, as well as subsequent improvements.

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High explosive corner turning performance and the LANL mushroom test

Cited by 6 publications

References 0 publications

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Shock-to-Detonation Transition simulations

A Simple Reactive‐Flow Model for Corner‐Turning in Insensitive High Explosives, Including Failure and Dead Zones. I. The Model.

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