Propagation Failure in Solid Explosives Under Dynamic Pre-Compression

Drimmer, B. E.; Liddiard, T. P.

doi:10.21236/ad0610682

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…In the regime of detonation propagation, shock desensitization manifests as the quenching of detonation in parts of the explosive that have been previously shocked. Drimmer and Liddiard 8 performed one of the first experiments showcasing detonation failure in pre-shocked HMX-based explosives and Campbell and Travis 9 observed similar behavior in RDX-based explosives.…”

Section: Introductionmentioning

confidence: 93%

“…The study provides just two data points but the form of the desensitization rate does not allow for both to be satisfied as discussed in section II A. Parameter ε is only required to be a small number, so ε = 10 −3 is chosen as in the original study. Parameter A is determined using the analytical solution of the desensitization source term (8) where we require that the desensitization variable ψ increases from 0 to 0.98 for the desensitization time and applied pressure that are provided by the experimental study. The two experimental measurements provide two values for A and their average is selected so that it is equally close to both data points.…”

Section: Desensitization Model Parameters For Composition Bmentioning

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: Introductionmentioning

confidence: 93%

Section: Desensitization Model Parameters For Composition Bmentioning

confidence: 99%

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

Ioannou

Nikiforakis

2021

Journal of Applied Physics

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Understanding the shock and detonation response of high explosives at the continuum and meso scales

Handley

Lambourn

Whitworth

et al. 2018

Applied Physics Reviews

171

106

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The shock and detonation response of high explosives has been an active research topic for more than a century. In recent years, high quality data from experiments using embedded gauges and other diagnostic techniques have inspired the development of a range of new high-fidelity computer models for explosives. The experiments and models have led to new insights, both at the continuum scale applicable to most shock and detonation experiments, and at the mesoscale relevant to hotspots and burning within explosive microstructures. This article reviews the continuum and mesoscale models, and their application to explosive phenomena, gaining insights to aid future model development and improved understanding of the physics of shock initiation and detonation propagation. In particular, it is argued that “desensitization” and the effect of porosity on high explosives can both be explained by the combined effect of thermodynamics and hydrodynamics, rather than the traditional hotspot-based explanations linked to pressure-dependent reaction rates.

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Propagation Failure in Solid Explosives Under Dynamic Pre-Compression

Cited by 2 publications

References 2 publications

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

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

Understanding the shock and detonation response of high explosives at the continuum and meso scales

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