Effect of an Inert Material’s Thickness and Properties on the Ratio of Energies Imparted by a Detonation’s 1st and 2nd Propulsion Stages

Backofen, Joseph E.; Weickert, Chris

doi:10.1063/1.1483696

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…The Gurney model [13][14][15] described the energy distribution in an infinitely long tube filled with explosives. However, the previously published Gurney model ignored the plastic deformation and thickness change of the wall during expansion.…”

Section: Cylinder Energy Modelmentioning

confidence: 99%

Determination of the JWL Parameters of Detonation Products Using Adaptive Genetic Algorithm

Cui

Song²,

et al. 2020

Propellants Explo Pyrotec

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The determination of Jones-Wilkins-Lee(JWL) equation of state (EOS)parameters for considered explosives plays a dominant role in hydrocode simulations, which are commonly used in the field of contemporary explosion mechanics. A two-point fitting method, combined with the excellent exploratory capabilities of Adaptive Genetic Algorithm (AGA) and the cylinder energy model was developed for the determination of JWL parameters of the detonation products for all ideal condensed explosives without conducting a cylinder test. The JWL parameters can be determined by the proposed method while only the initial density and the detonation velocity of the explosive can be obtained. JWL parameters of eight explosives were determined based on this method, and the results indicated that the P-V curves of eight fitted JWL EOSs, quantitatively evaluated by the determination coefficient, were in high agreement with that of standard JWL EOSs for all considered explosives. Moreover, the validity of the two-point fitting method was verified by corresponding numerical simulations. It was found that the numerical results based on the fitted parameters agreed well with that based on thedata from literature. The applicability of the two-point fitting method to a certain propellant was also discussed and the research can provide a reference for other propellants.

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Section: Cylinder Energy Modelmentioning

confidence: 99%

Determination of the JWL Parameters of Detonation Products Using Adaptive Genetic Algorithm

Cui

Song²,

et al. 2020

Propellants Explo Pyrotec

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A Constant‐Density Gurney Approach to the Cylinder Test

Reaugh

Souers

2004

Propellants Explo Pyrotec

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The previous analysis of the Cylinder test required the treatment of different wall thicknesses and wall materials separately. To fix this, the Gurney analysis is used, but this results in low values for full‐wall standard, ideal explosives relative to CHEETAH analyses. A new constant metal‐density model is suggested, which takes account of the thinning metal wall as the cylinder expands. With this model, the inner radius of the metal cylinder moves faster than the measured outer radius. Additional small corrections occur in all cylinders because of energy trapped in the copper walls. Also, the half‐wall cylinders have a small correction because the relative volumes of the gas products are smaller at a given outside wall displacement. The Fabry‐Perot and streak camera measurements are compared. The Fabry method is shown to equate to the constant density model.

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Additional Information Showing That a Cylinder’s Material and Geometry Affect Measuring an Explosive’s Gurney Velocity

Backofen¹

2006

AIP Conference Proceedings

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Effect of an Inert Material’s Thickness and Properties on the Ratio of Energies Imparted by a Detonation’s 1st and 2nd Propulsion Stages

Cited by 4 publications

References 4 publications

Determination of the JWL Parameters of Detonation Products Using Adaptive Genetic Algorithm

Determination of the JWL Parameters of Detonation Products Using Adaptive Genetic Algorithm

A Constant‐Density Gurney Approach to the Cylinder Test

Additional Information Showing That a Cylinder’s Material and Geometry Affect Measuring an Explosive’s Gurney Velocity

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