Intermediate Strength Blast Wave

Jones, Donald L.

doi:10.1063/1.1692177

Cited by 97 publications

(34 citation statements)

References 6 publications

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“…Figure 6 taken from Obed Samuelraj et al 25 shows the comparison between the experimental NONEL blast wave trajectory with the ideal blast wave theory proposed by Jones. 24 The figure shows that the trajectory of the blast wave measured along the tube axis follows the trend well. Figure 7 shows the setup used to measure the total pressure behind the porous plates.…”

Section: Nonel Tubesmentioning

confidence: 68%

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Detonation-driven–shock wave interactions with perforated plates

Zare‐Behtash

Gongora-Orozco

Kontis

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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The study of detonations and their interactions is vital for the understanding of the high-speed flow physics involved and the ultimate goal of controlling their detrimental effects. However, producing safe and repeatable detonations within the laboratory can be quite challenging, leading to the use of computational studies which ultimately require experimental data for their validation. The objective of this study is to examine the induced flow field from the interaction of a shock front and accompanying products of combustion, produced from the detonation taking place within a non-electrical tube lined with explosive material, with porous plates with varying porosities, 0.7-9.7%. State of the art high-speed schlieren photography alongside high-resolution pressure measurements is used to visualise the induced flow field and examine the attenuation effects which occur at different porosities. The detonation tube is placed at different distances from the plates' surface, 0-30 mm, and the pressure at the rear of the plate is recorded and compared. The results indicate that depending on the level of porosity and the Mach number of the precursor shock front secondary reflected and transmitted shock waves are formed through the coalescence of compression waves. With reduced porosity, the plates act almost as a solid surface, therefore the shock propagates faster along its surface.

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Section: Nonel Tubesmentioning

confidence: 68%

“…24 This theory was proposed for blast waves of intermediate strength (10> Áp/p 0 5 0.02, where Áp is the overpressure). Figure 6 taken from Obed Samuelraj et al 25 shows the comparison between the experimental NONEL blast wave trajectory with the ideal blast wave theory proposed by Jones.…”

Section: Nonel Tubesmentioning

confidence: 98%

Detonation-driven–shock wave interactions with perforated plates

Zare‐Behtash

Gongora-Orozco

Kontis

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…An estimate of the sensitivity of ground damage to energy deposition profiles can be obtained from the characteristic distance of an explosion. To have a similar blast footprint, the energy deposition profile needs to have similar energies deposited within a fraction of the characteristic distance, which is given by Jones [] as

R_{char} = {({((), \frac{5}{2})}^{2} \frac{5.34}{γ P_{normalatm}} E)}^{\frac{1}{3}},

where γ and P atm are the ratio of specific heats and pressure of the surrounding air and E is the explosive energy released. For a static explosion equivalent to Chelyabinsk, with an energy of 500 kt of TNT at 30 km altitude, the characteristic distance is 35 km.…”

Section: Resultsmentioning

confidence: 99%

Effect of yield curves and porous crush on hydrocode simulations of asteroid airburst

Robertson

Mathias

2017

JGR Planets

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Simulations of asteroid airburst are being conducted to obtain best estimates of damage areas and assess sensitivity to variables for asteroid characterization and mitigation efforts. The simulations presented here employed the ALE3D hydrocode to examine the breakup and energy deposition of asteroids entering the Earth's atmosphere, using the Chelyabinsk meteor as a test case. This paper examines the effect of increasingly complex material models on the energy deposition profile. Modeling the meteor as a rock having a single strength can reproduce airburst altitude and energy deposition reasonably well but is not representative of real rock masses (large bodies of material). Accounting for a yield curve that includes different tensile, shear, and compressive strengths shows that shear strength determines the burst altitude. Including yield curves and compaction of porous spaces in the material changes the detailed mechanics of the breakup but only has a limited effect on the burst altitude and energy deposition. Strong asteroids fail and create peak energy deposition close to the altitude at which ram dynamic pressure equals the material strength. Weak asteroids, even though they structurally fail at high altitude, require the increased pressure at lower altitude to disrupt and disperse the rubble. As a result, a wide range of weaker asteroid strengths produce peak energy deposition at a similar altitude.

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“…Thermal properties of aluminum are given in Table 1 [38,39,40]. The constant, A, in the equation for the density of liquid aluminum is 0.35 [41]. The specific heat ratios of aluminum vapor which is assumed to be a monatomic gas and the ambient gas, air, are taken to be [43].…”

Section: Resultsmentioning

confidence: 99%

Energy coupling and plume dynamics during high power laser heating of metals

Jeong

1997

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High power laser heating of metals was studied utilizing experimental and numerical methods with an emphasis on the laser energy coupling with a target and on the dynamics of the laser generated vapor flow. Rigorous theoretical modeling of the heating, melting, and evaporation of metals due to laser radiation with a power density below the plasma shielding threshold was carried out. Experimentally, the probe beam deflection technique was utilized to measure the propagation of a laser induced shock wave.The effects of a cylindrical cavity in a metal surface on the laser energy coupling with a solid were investigated utilizing photothermal deflection measurements. A numerical calculation of target temperature and photothermal deflection was performed to compare with the measured results. Reflection of the heating laser beam inside the cavity 1 was found to increase the photothermal deflection amplitude significantly and to enhance the overall energy coupling between a heating laser beam and a solid.Next, unsteady vaporization of metals due to nanosecond pulsed laser heating with an ambient gas at finite pressure was analyzed with a one dimensional thermal evaporation model for target heating and one dimensional compressible flow equations for inviscid fluid for the vapor flow. Target surface conditions, vapor velocity at the Knudsen layer, and the gasdynamic flow characteristics of the vapor were investigated.Lastly, the propagation of a shock wave during excimer laser heating of aluminumwas measured with the probe beam deflection technique. The transit time of the shock wave was measured at the elevation of the probe beam above the target surface; these results were compared with the predicted behavior using ideal blast wave theory. The experimental conditions at which the propagation of the laser generated shock wave agrees with the prediction fiom ideal blast wave theory were obtained. The propagation of a gaseous material plume was also observed from the deflection of the probe beam at later times.

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Intermediate Strength Blast Wave

Cited by 97 publications

References 6 publications

Detonation-driven–shock wave interactions with perforated plates

Detonation-driven–shock wave interactions with perforated plates

Effect of yield curves and porous crush on hydrocode simulations of asteroid airburst

Energy coupling and plume dynamics during high power laser heating of metals

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