Influence of diaphragm properties on shock wave transmission

Murray, S.B.; Zhang, F.; Gerrard, K. B.; Guillo, P.; Ripley, Robert C.

doi:10.1007/978-3-540-27009-6_120

“…But the variation of results can be easily and directly compared to charge performance with respect to variations in standoffs. 3 Figure 7 shows the results specified in required zero-particle-velocity peak reflected pressure and impulse to accelerate the six different cases to a velocity of 2 m/s. The simple 1-D numerical model described in the previous section was utilized along with an automated root-solving procedure to compute these results.…”

Section: Analysis and Discussion Of Differences In Coupled And Uncoupmentioning

confidence: 99%

“…Detailed fully coupled fluid-structure models for soil-filled concertainer walls using a commercial coupled CFD/CSM code have been constructed by Pope [1] and experimentally validated by Fowler [2]. Shock tube experiments by Murray et al [3] have been conducted to investigate velocity profiles and shock trajectories attained from a blast wave impacting rigid movable wall. In this study, the accuracy of an analytical solution by Meyer [4] computing the velocity-time history of a rigid movable wall impacted by a shock wave was investigated and found to be in good agreement for weak shock waves, but underestimated reflected loading for strong shock waves.…”

Section: Introductionmentioning

confidence: 99%

Effect of silty-sand compressibility on transferred velocity from impulsive blast loading

Scherbatiuk¹,

Pope²,

Fowler³

et al. 2012

WIT Transactions on State of the Art in Science and Engineering

0

View full text Add to dashboard Cite

A common assumption made in calculating response of walls subjected to blast loading is that the reflected blast loading is often based on rigid body dynamics along the thickness of walls and zero particle velocity at the fluid-structure interface. Of interest to the authors is the development of a quick-running impulse-dominated structural response model for soil-filled concertainer walls that assumes reflected impulse assuming zero particle velocity during the course of loading. The magnitude of response will directly depend on the velocity transferred in the thickness direction by the blast loading. The aim of this study is to assess whether a reduction factor should be applied to reduce the initial velocity corresponding to the zero-particle-velocity reflected impulse for concertainer walls filled with compressible silty-sand. Results obtained from a 1-D numerical program using a simple analytical coupling model are validated with those obtained from a commercial coupled Computation Fluid Dynamics and Computational Solid Mechanics (CFD/CSM) code. Both coupled and uncoupled loading combinations are investigated for rigid body, elastic, and compressible silty-sand material behaviours using the simple 1-D numerical program developed and validated. Graphical results for a range of peak blast pressures are compiled to present the differences in zero-particle-velocity reflected impulse required to attain the same velocity in the thickness direction for each different combination. The resulting differences in charge standoffs between each combination are compared as well for a number of different charge sizes. For this specific problem of calculating transferred velocity in the thickness direction for a silty-sand filled concertainer wall subjected to impulsive blast loading, results that include coupling only lead to a small difference in the resulting charge standoff and therefore reasonable results will be achieved assuming uncoupled loading and rigid body dynamics.A model of a simple soil-filled concertainer wall subjected to uniform blast loading was constructed using a commercial CFD/CSM code. Figure 2 compares www.witpress.com, ISSN 1743-3509 (on-line)

show abstract

“…Zero Particle Velocity Reflected Impulse (kPa-ms) Zero Particle Velocity Reflected Pressure (kPa) 3 Figure 7 shows the results specified in required zero-particle-velocity peak reflected pressure and impulse to accelerate the six different cases to a velocity of 2 m/s. The simple 1-D numerical model described in the previous section was utilized along with an automated root-solving procedure to compute these results.…”

Section: Analysis and Discussion Of Differences In Coupled And Uncoupmentioning

confidence: 99%

“…Shock tube experiments by Murray et al [3] have been conducted to investigate velocity profiles and shock trajectories attained from a blast wave impacting rigid movable wall. In this study, the accuracy of an analytical solution by Meyer [4] computing the velocity-time history of a rigid movable wall impacted by a shock wave was investigated and found to be in good agreement for weak shock waves, but underestimated reflected loading for strong shock waves.…”

Section: Introductionmentioning

confidence: 99%

Effect of silty-sand compressibility on transferred velocity from impulsive blast loading

Scherbatiuk¹,

Pope²,

Fowler³

et al. 2006

WIT Transactions on the Built Environment, Vol 87

1

0

View full text Add to dashboard Cite

A common assumption made in calculating response of walls subjected to blast loading is that the reflected blast loading is often based on rigid body dynamics along the thickness of walls and zero particle velocity at the fluid-structure interface. Of interest to the authors is the development of a quick-running impulse-dominated structural response model for soil-filled concertainer walls that assumes reflected impulse assuming zero particle velocity during the course of loading. The magnitude of response will directly depend on the velocity transferred in the thickness direction by the blast loading. The aim of this study is to assess whether a reduction factor should be applied to reduce the initial velocity corresponding to the zero-particle-velocity reflected impulse for concertainer walls filled with compressible silty-sand. Results obtained from a 1-D numerical program using a simple analytical coupling model are validated with those obtained from a commercial coupled Computation Fluid Dynamics and Computational Solid Mechanics (CFD/CSM) code. Both coupled and uncoupled loading combinations are investigated for rigid body, elastic, and compressible silty-sand material behaviours using the simple 1-D numerical program developed and validated. Graphical results for a range of peak blast pressures are compiled to present the differences in zero-particle-velocity reflected impulse required to attain the same velocity in the thickness direction for each different combination. The resulting differences in charge standoffs between each combination are compared as well for a number of different charge sizes. For this specific problem of calculating transferred velocity in the thickness direction for a silty-sand filled concertainer wall subjected to impulsive blast loading, results that include coupling only lead to a small difference in the resulting charge standoff and therefore reasonable results will be achieved assuming uncoupled loading and rigid body dynamics.

show abstract

“…For most tests, the diaphragm petaled open cleanly, however, some small fragments were swept into the flow and likely interfered with the implosion symmetry. It is expected that after rupturing the diaphragm, it took some time for the imploding shock to form from the imploding jet of high-pressure gas [25], but this effect was not explored.…”

Section: Test Sectionmentioning

confidence: 99%

Detonation Initiation in a Tube via Imploding Toroidal Shock Waves

Jackson

¹

,

Shepherd

²

2008

View full text Add to dashboard Cite

The effectiveness of imploding waves at detonation initiation of stoichiometric ethylene-and propane-oxygennitrogen mixtures in a tube was investigated. Implosions were driven by twice-shocked gas located at the end of a shock tube, and wave strength was varied to determine the critical conditions necessary for initiation as a function of diluent concentration for each fuel. Hydrocarbon-air mixtures were not detonated due to facility limitations, however, detonations were achieved with nitrogen dilutions as large as 60 and 40% in ethylene and propane mixtures, respectively. The critical-energy input required for detonation of each dilution was then estimated using the unsteady energy equation. Blast-wave initiation theory was reviewed and the effect of tube wall proximity to the blast-wave source was considered. Estimated critical energies were found to scale better with the planar initiation energy than the spherical initiation energy, suggesting that detonation initiation was influenced by wave reflection from the tube walls.

show abstract

Influence of diaphragm properties on shock wave transmission

Cited by 3 publications

References 1 publication

Effect of silty-sand compressibility on transferred velocity from impulsive blast loading

Effect of silty-sand compressibility on transferred velocity from impulsive blast loading

Effect of silty-sand compressibility on transferred velocity from impulsive blast loading

Detonation Initiation in a Tube via Imploding Toroidal Shock Waves

Contact Info

Product

Resources

About