Jack Rabbit Pretest Data For TATB Based IHE Model Development

Hart, Michael; Strand, Oliver T.; Bosson, S T

doi:10.2172/947749

Cited by 3 publications

(4 citation statements)

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“…The implementation of the model is validated against a test case which involves detonation diffraction around a rigid corner as in the original article on the desensitization model 26 . This is extended to the case of a solid corner and even further by examining the configuration of the Jack Rabbit series of experiments 39 .…”

Section: Discussionmentioning

confidence: 99%

“…The desensitization model is further validated against the "Jack Rabbit" experiments performed at Lawrence Livermore National Laboratory 39 . These are a series of five experiments (named PT3-7) with a complex setup that have been specifically designed to assess mathematical models of detonation in terms of detonation diffraction and desensitization.…”

Section: The Jack Rabbit Experimentsmentioning

confidence: 99%

“…7. Plots of the numerical solution of experiment PT5 of the Jack Rabbit experiments39 at times (a) 2 µs, (b) 4 µs, (c) 7 µs, (d) 12 µs, (e) 17 µs and (f) 19 µs. As the spherical detonation propagates along the steel disk, an inert shock is transmitted into the explosive on the other side of the disk.…”

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confidence: 99%

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Multiphysics modeling of the initiating capability of detonators. II. Booster initiation

Ioannou

Nikiforakis

2021

Journal of Applied Physics

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Detonators are explosive devices used for the initiation of secondary explosives in commercial and military applications. They are characterized by their initiating capability which is a critical factor for their safe and effective use but challenging to assess accurately. In this two-part study, we employ numerical simulations to investigate the blast wave generated by detonators and examine their initiating capability. The first part follows the European underwater test which evaluates detonators in isolation (direct method). The second part, presented here, investigates detonators placed within a receiving explosive charge (indirect method). Specifically, the detonator is placed inside a booster device which contains secondary explosive and together form an initiating system used to ignite mining blastholes.The physical system is modeled using a multiphysics methodology to accurately capture the response of the materials present in the configuration (explosives, metals and fluids). The reactive model is extended to account for shock desensitization where explosives become more difficult to initiate after the passage of weak shock waves. The variability of the blast wave generated by detonators, observed in the first part of the study, can lead to partial desensitization resulting in pockets of unreacted explosive which inhibit booster initiation and performance. The computational implementation is extensively validated and calibrated against experiment before employed for the study of booster initiation by a range of detonators. Results show that the booster is susceptible to shock desensitization which occurs in varying degrees for different types of detonators and can significantly impact the performance of the initiating system.

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Section: Discussionmentioning

confidence: 99%

Section: The Jack Rabbit Experimentsmentioning

confidence: 99%

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Multiphysics modeling of the initiating capability of detonators. II. Booster initiation

Ioannou

Nikiforakis

2021

Journal of Applied Physics

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“…Acknowledgment. The author thanks Mark Hart, who envisioned, designed, and analyzed these experiments; 36,37…”

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Corner Turning and Shock Desensitization Experiments plus Numerical Modeling of Detonation Waves in the Triaminotrinitrobenzene Based Explosive LX-17

Tarver

2010

J. Phys. Chem. A

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Five new experiments are reported that tested both detonation wave corner turning and shock desensitization properties of the triaminotrinitrobenzene (TATB) based plastic bonded explosive (PBX) LX-17. These experiments used small pentaerythritol tetranitrate (PETN) charges to initiate hemispherical ultrafine TATB (UF TATB) boosters, which then initiated LX-17 hemispherical detonations. The UF TATB boosters were placed under steel shadow plates embedded in the LX-17 cylindrical charges, which were covered by thin aluminum plates. The LX-17 detonation waves propagated outward until they reached the aluminum plates, which were instrumented with photonic Doppler velocimetry probes to measure their axial free surface velocities. X-ray radiographs and framing camera images were taken at various times. The LX-17 detonations propagated around the two corners of the steel shadow plates and into thin LX-17 layers placed between the steel and the top aluminum plates. The detonation waves were met there by weak diverging shocks that propagated through the steel plates and imparted 1-2 GPa pressures to these unreacted LX-17 layers. These weak shock waves compressed and desensitized the unreacted LX-17, resulting in failures of the LX-17 detonation waves. The hydrodynamics of double corner turning and shock desensitization in the five experiments were modeled in two dimensions using the Ignition and Growth LX-17 detonation reactive flow model. The calculated arrival times and axial free surface velocity histories of the top aluminum plates were in excellent agreement with the experimental measurements.

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Modeling of the jack rabbit series of experiments with a temperature based reactive burn model

Desbiens

2017

AIP Conference Proceedings

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Jack Rabbit Pretest Data For TATB Based IHE Model Development

Cited by 3 publications

References 0 publications

Multiphysics modeling of the initiating capability of detonators. II. Booster initiation

Multiphysics modeling of the initiating capability of detonators. II. Booster initiation

Corner Turning and Shock Desensitization Experiments plus Numerical Modeling of Detonation Waves in the Triaminotrinitrobenzene Based Explosive LX-17

Modeling of the jack rabbit series of experiments with a temperature based reactive burn model

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