Shock Initiation of PBX‐9404 by electrically driven flyer plates

Weingart, R.C.; Jackson, Richard K.; Honodel, C.; Lee, R. S.

doi:10.1002/prep.19800050604

Cited by 19 publications

(16 citation statements)

References 2 publications

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“…A viscoelastic equation of state (EOS) for PMMA was employed. [34][35][36] For these two materials, the shock-velocity ͑U S ͒-particle-velocity ͑u p ͒ relationship is given by 21 A Mie-Grüneisen EOS was used for water 30,33 and Mylar.…”

Section: Hydrocode Modelmentioning

confidence: 99%

Tensile failure of water due to shock wave interactions

Boteler

Sutherland

2004

Journal of Applied Physics

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Delayed failure in a shock-loaded silicon carbide A series of low stress shock impact experiments were performed on water to examine the dynamic response under tension and establish a lower bound for water rupture or cavitation threshold. The experimental cell configuration permitted particle velocity measurements at the water-air free surface separated by a 5-m-thick aluminized Mylar diaphragm. Water samples were triply distilled, de-ionized, and degassed prior to experiments. The average tensile strength for shock-induced cavitation in the water was found to be 8.7± 0.2 MPa. Experiments are compared with hydrocode simulations using a simple fracture criterion and published experimental data.

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Section: Hydrocode Modelmentioning

confidence: 99%

Tensile failure of water due to shock wave interactions

Boteler

Sutherland

2004

Journal of Applied Physics

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“…Weingart (8) has shown that the initiation threshold for 1.80 gycm 3 TATB pellets as a function of¯yer diameter was the same for the 25.4 mm and 12.7 mm¯yers, but substantially increased as the¯yer diameter was reduced.…”

Section: Diameter Effectmentioning

confidence: 99%

“…± For PBX-9404, Figure 1 shows the new relationship compared to experimental data (Kapton¯yer plate impacts (8) ). Although the behaviour of this explosive seemed well ®tted by the original criterion, it can be shown that the new one gives a better ®t over a broader pressure range.…”

Section: (A) Heterogeneous Explosivesmentioning

confidence: 99%

Threshold Energy: A Dimensional Extension of the Critical Energy for Jet Attack Application

Peugeot¹,

Quidot

1998

Propellants, Explosives, Pyrotechnics

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The critical energy criterion (E c ) developed by Walker and Wasley is widely used to determine the response of explosive submitted tō yer plate impacts. As it has been shown previously to be limited in the pressure range over which it applies, in the number of explosive formulations which appear to obey it and in the range of projectiles covered by it, we have modi®ed twice this criterion. The ®rst mod-i®cation, taking into account a trend toward lower minimum energy with increasing pressure (pressure¯uence) enables it to be applied to explosives previously found to be outside the original criterion and to extend the pressure range. The second modi®cation taking into account a trend toward higher minimum energy with decreasing impact surface area (impact surface dependence) is a bidimensional extension of the critical energy concept. The threshold energy per unit area thus de®ned allows to predict the shock initiation limits of bare explosives (PBX and cast formulations) impacted by shaped charge jets.

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“…P o is the unique value that is entered into our code models at this time. Table 1 lists the coefficients obtained from the data [4,[6][7][8][9][10][11][12] with ours and the James' methods, and there is not a lot of difference. The runs have the same flyer and explosive radii, which is 12.7 mm in most cases.…”

Section: Flyer Datamentioning

confidence: 99%

“…In Table 5, we pull together the three sources of pressure data: flyer thresholds [4,[6][7][8][9][10][11][12], calculated run-time values [11,21,[25][26][27][28][29][30][31][32][33][34][35][36][37] and the smallest gap test pressures available [15,18]. There are only a few Eglin shots, so we rely for a gap tests almost completely on the NSWC LSGT.…”

Section: Pressure Threshold Summarymentioning

confidence: 99%

Initiation Pressure Thresholds from Three Sources

Souers

Vitello

2007

Propellants Explo Pyrotec

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Pressure thresholds are minimum pressures needed to start explosive initiation that ends in detonation. We obtain pressure thresholds from three sources. Run‐to‐detonation times are the poorest source but the fitting of a function gives rough results. Flyer‐induced initiation gives the best results because the initial conditions are the best known. However, very thick flyers are needed to give the lowest, asymptotic pressure thresholds used in modern models and this kind of data is rarely available. Gap test data are in much larger supply but the various test sizes and materials are confusing. We find that explosive pressures are almost the same if the distance in the gap test spacers are in units of donor explosive radius. Calculated half‐width time pulses in the spacers may be used to create a pressure‐time curve similar to that of the flyers. The very‐large Eglin gap tests give asymptotic thresholds comparable to extrapolated flyer results. The three sources are assembled into a much‐expanded set of near‐asymptotic pressure thresholds. These thresholds vary greatly with density: for TATB/LX‐17/PBX 9502, we find values of 4.9 and 8.7 GPa at 1.80 and 1.90 g/cm3, respectively.

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Shock Initiation of PBX‐9404 by electrically driven flyer plates

Cited by 19 publications

References 2 publications

Tensile failure of water due to shock wave interactions

Tensile failure of water due to shock wave interactions

Threshold Energy: A Dimensional Extension of the Critical Energy for Jet Attack Application

Initiation Pressure Thresholds from Three Sources

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