Review of Jones-Wilkins-Lee equation of state

Abstract:In this work, a new bicyclic nitramine, cis-1, 3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole (bicyclo-HMX or BCHMX), has been tested for its performance as a shaped charge explosive filler in comparison with three other interesting cyclic nitramines. Four shaped charges were prepared using different nitramine-based plastic bonded explosives (PBXs), and their performance was measured experimentally in terms of the penetration depth into laminated rolled homogeneous armour (RHA) targets. The explosive fillers were highly pressed PBXs based on RDX, HMX, BCHMX and CL-20, bonded by Viton A binder. The Autodyn numerical hydrocode was implemented to determine the shaped charge jet's characteristics and its penetration depth. The experimental and calculated detonation characteristics of the explosives used are reported. Relationships between the detonation characteristics of the explosives and the jet characteristics were observed. The results show that CL-20 is the most powerful explosive, with the largest penetration depth into the RHA target, while BCHMX explosive has a relatively enhanced penetration depth with respect to RDX explosive. The results of the Autodyn code calculations are consistent with the experimental measurements, with a maximum difference of 6.6%.

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“…The equation of state (EOS) for the high explosive was the "Jones-Wilkins-Lee" (JWL) equation [24], i.e.…”

Section: The Explosive Chargementioning

confidence: 99%

Application of BCHMX in Shaped Charges against RHA Targets Compared to Different Nitramine Explosives

Elbeih¹,

Elshenawy²,

Zeman³

et al. 2018

Cent. Eur. J. Energ. Mater.

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“…Detonation is a rapid process that converts explosive material into gaseous products, and it is usually completed at the start of a given simulation. TNT explosive was modelled with the Jones-Wilkins-Lee equation of state [32] using following expression:…”

Section: Materials Modelsmentioning

confidence: 99%

Analysis of Blast Wave Parameters Depending on Air Mesh Size

Draganić

Varevac

2018

Shock and Vibration

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Results of numerical simulations of explosion events greatly depend on the mesh size. Since these simulations demand large amounts of processing time, it is necessary to identify an optimal mesh size that will speed up the calculation and give adequate results. To obtain optimal mesh sizes for further large-scale numerical simulations of blast wave interactions with overpasses, mesh size convergence tests were conducted for incident and reflected blast waves for close range bursts (up to 5 m). Ansys Autodyn hydrocode software was used for blast modelling in axisymmetric environment for incident pressures and in a 3D environment for reflected pressures. In the axisymmetric environment only the blast wave propagation through the air was considered, and in 3D environment blast wave interaction and reflection of a rigid surface were considered. Analysis showed that numerical results greatly depend on the mesh size and Richardson extrapolation was used for extrapolating optimal mesh size for considered blast scenarios.

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“…Among these equations, because of the simplicity and ability to predict proper relationship between pressure, specific volume and internal energy, JWL EOS is the most widely used in numerical simulations. Jones-Wilkins-Lee (JWL) EOS shows thermodynamic properties of reacted and unreacted products of explosion and is described as (Baudin & Serradeill, 2010):…”

Section: Numerical Model For Explosive Chargementioning

confidence: 99%

A parametric study on the effects of surface explosions on buried high pressure gas pipelines

Adibi¹,

Azadi²,

Farhanieh³

et al. 2017

10.5267/j.esm

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Underground gas pipelines are one of the vital parts of each country which surface blasts can break down such pipelines, making destructive explosions and threatening the safety of neighborhood structures and people. In this paper, to enhance the safety of these lines, response of a buried 56-inch diameter high pressure natural gas pipeline to a surface blast was numerically investigated. Besides, the effects of: i) explosive mass, ii) pipeline thickness, iii) burial depth and iv) concrete protective layer on pipeline deformation were parametrically studied. To simulate the problem according to actual explosion events, geometries were modeled in real scales, pipeline properties were predicted with Johnson-Cook strength and failure model and soil strength was determined by Drucker-Prager model. Also, explosive charge and natural gas were modeled with JWL (Jones-Wilkins-Lee) and ideal gas equation of states. For validation of the numerical method, three bench mark experiments were reproduced. Comparison of the numerical results and the experimental data confirmed the accuracy of the numerical method. Results of parametric studies indicated that by increasing the burial depth from 1.4 to 2.2 m, deformation of the pipeline was reduced about 71%. By analyzing the deformation plots, it was found that in a constant explosive mass, burial depth has a greater effect than pipeline thickness on pipeline deformation reduction. It was also shown that using a concrete protective layer may act reversely and increase pipeline destruction. In other words, to enhance the safety of pipelines, a certain thickness of concrete must be used.

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Review of Jones-Wilkins-Lee equation of state

Cited by 46 publications

References 4 publications

Application of BCHMX in Shaped Charges against RHA Targets Compared to Different Nitramine Explosives

Application of BCHMX in Shaped Charges against RHA Targets Compared to Different Nitramine Explosives

Analysis of Blast Wave Parameters Depending on Air Mesh Size

A parametric study on the effects of surface explosions on buried high pressure gas pipelines

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