Predicting Blast Waves from the Axial Direction of a Cylindrical Charge

Knock, Clare; Davies, Nigel; Reeves, Thomas

doi:10.1002/prep.201300188

Cited by 34 publications

(18 citation statements)

References 23 publications

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“…Past work on the blast waves from cylindrical charges initiated at one end indicates that the blast wave is not the same in all directions [3][4][5][7][8][9][10].I nstead multiple shock waves are seen in the direction of least presented area [3,5].…”

Section: Singlep Oint End Initiationmentioning

confidence: 99%

“…Publishedw ork on cylindricalc harges in air has either had single point initiation [3,5,[9][10][11][12] or if double endedi nitiated it has been at fixed L/D ratios [ 6].T he present work investigates the blast field generatedb yc ylindrical charges initiated simultaneously at both endsu sing aw ide range of L/D ratios. The aim is to verify if double ended initiation has am ajore ffect on the blastf ield and if so to quantify the effects.…”

Section: Multiple Point Initiationmentioning

confidence: 99%

“…Most data available for predictingt he shock waves from an explosiona re based on spherical charges [1,2].H owever, warheads generally have ac ylindrical shape.C ylindrical, high explosive charges produce more complexb last fields compared to spherical charges, especially close intot he charges [3,4].T his can result in multiple shockwaves with the peak overpressure of secondary shock waves sometimes exceedingt hatofthe primary shock waves [5].…”

Section: Introductionmentioning

confidence: 99%

“…

1IntroductionMost data available for predictingt he shock waves from an explosiona re based on spherical charges [1,2].H owever, warheads generally have ac ylindrical shape.C ylindrical, high explosive charges produce more complexb last fields compared to spherical charges, especially close intot he charges [3,4].T his can result in multiple shockwaves with the peak overpressure of secondary shock waves sometimes exceedingt hatofthe primary shock waves [5].The shapeo ft he blast wave also depends on the position and number of pointso fi gnition [6].H ence to be able to predict the effects of an explosive charge it is essential to understand the effects of the number of ignition points on the production of shockwaves.This paper looks at the effect of multiple ignitionp oints on the shock waves produced from cylindrical charges. New experiments were carried out detonating cylinders and discs of high explosive.

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confidence: 99%

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Radial Blast Prediction for High Explosive Cylinders initiated at Both Ends

Anastacio

Knock

2016

Propellants Explo Pyrotec

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This paper presents experimental results for the double ended initiation of cylindrical, explosive charges. Bare cylindrical charges of PE4 (RDX/binder 88/12 %) were used with length to diameter ratios of 1/3.7 to 5.75/1 and masses of 0.25 to 0.45 kg. Pressure measurements were taken at distances of 1 to 3.5 m in the radial direction. It was found that it was possible to predict the peak overpressure in the radial direction using P=K′ M(L/D)1/3R−3. M is the mass of explosive, L the length of the explosive charge, D the diameter of the explosive charge, and R the distance from the charge. For PE4, K′=2251 kPa m3 kg−1 for all length to diameter ratios. The double ended initiation gives a peak overpressure 1.6 times that for single ended initiation. The impulse for double ended initiation was found to be the same as for single ended initiated charges.

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Section: Singlep Oint End Initiationmentioning

confidence: 99%

Section: Multiple Point Initiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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mentioning

confidence: 99%

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Radial Blast Prediction for High Explosive Cylinders initiated at Both Ends

Anastacio

Knock

2016

Propellants Explo Pyrotec

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“…Although these empirical data enabled predicting the blast phenomena, the shape of explosive influences the blast wave propagation considerably [3,4].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Shape of Explosive Charge on the Blast Wave Propagation

Yoo

Choi

Lee

et al. 2016

MATEC Web of Conferences

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Abstract. For several decades, a blast wave due to explosive detonation has been investigated extensively. Base on a significant amount of experimental data, the blast wave propagation has been predicted at specific conditions. However, only spherical shape of explosive has been considered in most studies. Recently, it was noted that the shape of explosive influences the blast wave propagation significantly. In this study, a finite element analysis was carried out to investigate the effect of the shape of explosive on the blast wave propagation. Two different shapes of explosive were compared in blast wave propagation; spherical and cylindrical shape. It was found that the spherical and cylindrical shape blast show different characteristics in the blast wave propagation. The spherical blast showed the isotropic wave propagation as verified by experimental data. However, the cylindrical blast showed more concentrated and faster propagation in the axial direction.

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Blast Waves and Fragment Velocities of Erythritol Tetranitrate

Tagawa

Hiyoshi

Takeuchi

et al. 2016

Propellants Explo Pyrotec

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Erythritol tetranitrate (ETN) is a highly sensitive nitrate ester that has a similar molecular structure to nitroglycerine and penta‐erythritol tetranitrate (PETN). In this study, experiments detonating 175 g of ETN were repeated three times to measure blast waves 0.6 m above the ground. TNT and PETN were also tested under the same conditions for comparison. The average peak overpressure of ETN was about 30 kPa at 3 m from the explosion center (5.4 m kg−1/3 scaled distance), which was much higher than that of TNT (about 22 kPa) and similar to PETN. The effects of the reflected wave from the ground appeared at greater distances of 5 and 7 m (8.9 and 12.5 m kg−1/3, respectively), as verified by the waveforms and high‐speed camera images. Previous TNT data for peak overpressure vs. scaled distance were used to calculate the TNT equivalents for the experimental data, which revealed that ETN had a similar value to PETN. The fragments velocities of steel cylinders were measured, and that of ETN (1040 m s−1) was higher than that of TNT (957 m s−1) and lower than that of PETN (1260 m s−1). The Gurney constant for each explosive was obtained by using the initial fragment velocities.

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Predicting Blast Waves from the Axial Direction of a Cylindrical Charge

Cited by 34 publications

References 23 publications

Radial Blast Prediction for High Explosive Cylinders initiated at Both Ends

Radial Blast Prediction for High Explosive Cylinders initiated at Both Ends

Influence of the Shape of Explosive Charge on the Blast Wave Propagation

Blast Waves and Fragment Velocities of Erythritol Tetranitrate

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