Perforated Plates as Passive Mitigation Systems

Langdon, G.S.; Nurick, G.N.; Balden, V.H.; Timmis, R. B.

doi:10.14429/dsj.58.1644

Cited by 25 publications

(13 citation statements)

References 14 publications

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“…The highest attenuation was obtained with the grid having the lowest porosity. Langdon et al [13] have observed the mitigation capacity of perforated plates on plates fully clamped to blast loading directed down a tube. The influence of a mild steel plate's thickness and hole size on its response to blast loading has been also studied [14].…”

Section: Introductionmentioning

confidence: 99%

Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

Schunck

Eckenfels

2021

SN Appl. Sci.

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This work is set in the context of blast mitigation based on geometric means, namely perforated metallic plates or grids. When a shock wave passes through a perforated plate, the flow field is modified, and new shock waves are created, as well as regions of vortices and turbulence in which the energy of the wave can be dissipated. In this study, an explosive driven shock tube (EDST) was used to visualize the interaction of a blast wave with perforated plates or with a piece of cast metallic foam. Additionally, the overpressure and the impulse of the reflected blast wave on a wall located downstream were assessed. The use of an EDST allowed the evaluation of the mitigation capacity under a high dynamic loading. Several combinations of perforated plates were tested, varying the geometry and the number of plates, as well as switching between two different spacings. When the shock wave collided with a plate, we observed that part of the incident shock wave was reflected by the plate, while the remaining wave was transmitted through it. Downstream of the plate, both the overpressure and the impulse were reduced, this effect being more prominent as the porosity of the plates decreased. When two plates were placed as obstacles, this phenomenon of reflection/transmission was repeated twice consecutively, further reducing the downstream reflected overpressure and impulse. An array of three plates or a piece of metallic foam were even more effective in mitigating the blast wave. Varying the distance between two or three plates had no effect on blast mitigation.

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Section: Introductionmentioning

confidence: 99%

Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

Schunck

Eckenfels

2021

SN Appl. Sci.

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“…Furthermore DP and TRIP steels have high impact strength and they can be used for perforated steel armour. Because perforated plates are also attractive for passive mitigation systems against explosive blast [24]. In this study, it was aimed to investigate the metallurgical structure of the weld zone (FZ), strength values such as hardness, tensile strength, toughness and elongation percentages of the welded parts by similar combining TRIP 800 and DP 1000 steels with the EBW welding method.…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Sezgin

Hayat

2020

Soldag. insp.

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TRIP 800 steel and DP 1000 steel welded by using the electron beam welding (EBW) method were investigated in this study. Martensite was a dominant phase at the fusion zone (FZ) of both steels. In addition, bainite and austenite were observed in the FZ of TRIP 800. The hardness of FZ and heat affected zone (HAZ) of both steels were higher than their base metals. The hardness of FZ of the TRIP 800 joinings was higher than the FZ of DP 1000. Ductility and tensile strength decreased at both of the joinings. However, this decrease became higher at the DP 1000 steel joinings compared to the TRIP 800 joinings. It was observed that the TRIP 800 joining absorbed more energy than the DP 1000 joining at impact notch test for each temperature.

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“…Solutions proposed for attenuation and reflection of shock waves and high-energy flows included use of permeable solids, porous materials, and solid geometric reflectors. 4 Various media that have been used in research include energy-absorbing or energy-dissipating foams, 5 liquids encapsulated in elastic shells, textiles, cellular materials, resin-bonded aggregates, honeycomb structures, 6 perforated plates, 7 and granular media.…”

Section: Introductionmentioning

confidence: 99%

Uninstrumented Measurement Method for Granular Porous Media Blast Mitigation Assessment

et al. 2015

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The current paper is concerned with testing the efficiency of a uninstrumented method in assessing granular porous media capacity to mitigate blast impulse. A thin plate constant deformation test was carried out based on the findings obtained throughout blast-structure interaction phenomena. The proposed test requires only post-test measured data and no test instrumentation is needed. The test protocol under scrutiny consists of a short series of 200 g TNT charge detonations at 1000 mm distance from the tested structures. All test results have shown impulse mitigation. The findings obtained in the test under scrutiny tally those in the pendulum test. The final section of the current article is concerned with the improvement and shortcomings of the test developed.

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Perforated Plates as Passive Mitigation Systems

Cited by 25 publications

References 14 publications

Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Uninstrumented Measurement Method for Granular Porous Media Blast Mitigation Assessment

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