Analysis of Blast Wave Parameters Depending on Air Mesh Size

Draganić, Hrvoje; Varevac, Damir

doi:10.1155/2018/3157457

Cited by 15 publications

(10 citation statements)

References 24 publications

(23 reference statements)

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“…C4 explosive filling and surrounding air were modeled in Euler solver whereas the steel reflecting surfaces with the transducers were modeled in ALE. An optimized grid size of 1 × 1 mm 2 was used for both solvers (Ahmed and Malik, 2020; Ahmed et al, 2020; Draganić and Varevac, 2018). The air surrounding C4 charge was assigned specific internal energy of 2.068e+5 kJ/kg for ambient pressure of 101 kPa (14.7 psi).…”

Section: Experimental/simulations Comparisonmentioning

confidence: 99%

Experimental investigations of the response of a portable container to blast, fragmentation, and thermal effects of energetic materials detonation

Ahmed

Malik

2021

International Journal of Protective Structures

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The detonation of an energetic material (EM) is manifested in the form of blast wave, fragmentation of casing material, and thermal effects. These effects are very destructive and cause injuries-being fatal-and structural damage as well. The attenuation of these effects is a prime focus. C4 explosive weighing 104 g was tested as surface burst. Peak overpressures of 1362 kPa and fireball radius of 0.65 m were measured. A multi-layer container comprised steel liner, Kevlar woven fabric, and laminated glass fiber reinforced polymer (GFRP) was developed and investigated to counter the combined blast, fragmentation, and thermal effects of EM detonation. Commercially available shaving foam was characterized and used as filling material inside the container. The foam bubbles have shown a good stability with time. The shaving foam quenched the fireball and afterburning reactions owing to rapid heat and momentum transfer mechanism. The containment system provided more than 80% overpressure reduction with respect to an equivalent open-air detonation and also restricted any escape to lateral directions. Coupled Euler-ALE (Arbitrary Lagrangian-Eulerian) approach was employed to numerically simulate the blast wave parameters. A good agreement is obtained between the simulation and experimental results.

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Section: Experimental/simulations Comparisonmentioning

confidence: 99%

Experimental investigations of the response of a portable container to blast, fragmentation, and thermal effects of energetic materials detonation

Ahmed

Malik

2021

International Journal of Protective Structures

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“…The model consisted of two parts, air and explosive material. Air was modelled as an ideal gas with atmospheric pressure initializing at the start of the simulation while explosive was modelled as TNT, via Jones-Wilkins-Lee (JWL) equation of state [5], [6]. Air is a gaseous material and as such, there is no possibility of stress transfer.…”

Section: Experimental Set-upmentioning

confidence: 99%

Statistical Analysis of Blast Wave Decay Coefficient and Maximum Pressure Based on Experimental Results

Lukić

Draganić

Gazić

et al. 2020

WIT Transactions on the Built Environment

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Various expressions have been given in the literature for calculating blast wave parameters. Without experimental testing, it is difficult to determine which expression will predict the actual measurements more realistically. In this paper, a statistical analysis of two blast wave parameters, maximum overpressure and pressure-time diagram decay coefficient, was conducted based on field tests of the cylindrical TNT charge free-air detonation. Simple numerical simulation was also performed in order to compare the obtained maximum overpressures with the field test measurements. A comparison of the maximum free-field overpressures provided insights on the influence of the air mesh size as this proved to be a critical parameter. Statistically obtained blast wave decay coefficient and the maximum overpressure was compared with the analytical expressions given by different authors to determine the most appropriate description of experimental tests. Expressions are given depending on the scaled distance, i.e. the ratio of standoff distance to measuring sensors and cubic root of the charge mass. Expressions for blast wave parameters are used for a quick approximation of blast load for further analysis of structural elements, so their accurate determination ensures more realistic blast analysis and safer design.

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“…e numerical results are affected by the mesh size especially when the nonlinear material models are adopted in simulation [34]. With a larger mesh size, the computing time is applicable while the accuracy of the results is lower.…”

Section: Mesh Sizementioning

confidence: 99%

Numerical Evaluation of Reinforced Concrete Columns Retrofitted with FRP for Blast Mitigation

Dong

Zhao

Zhang

2020

Advances in Civil Engineering

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Fiber reinforced polymer (FRP) material is commonly applied in retrofitting structures due to the advantages of high strength and well corrosion resistance. Previous studies indicated that retrofitting with FRP sheet was an effective way for protecting the existing structures to resist the blast loads, but little research made comprehensive comparison study on the blast response of RC columns with different retrofitting strategies. This paper proposed a series of FRP retrofitting strategies and evaluated their effect on blast mitigation using numerical analysis approach. Comparison studies were conducted on the effect of FRP type, FRP thickness, and retrofitting mode on blast mitigation. A finite element model of RC columns retrofitted with FRP under blast loading was developed. The model considered the strain rate effect of steel and concrete and the orthotropic property of FRP composites. The reliability of the proposed model was validated against the data from a field blast test. Based on the verified model, the blast responses of RC columns with different retrofitting strategies were numerically investigated. According to the result analysis, appropriate FRP type, FRP thickness, retrofitting mode, and retrofitting length were recommended.

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Analysis of Blast Wave Parameters Depending on Air Mesh Size

Cited by 15 publications

References 24 publications

Experimental investigations of the response of a portable container to blast, fragmentation, and thermal effects of energetic materials detonation

Experimental investigations of the response of a portable container to blast, fragmentation, and thermal effects of energetic materials detonation

Statistical Analysis of Blast Wave Decay Coefficient and Maximum Pressure Based on Experimental Results

Numerical Evaluation of Reinforced Concrete Columns Retrofitted with FRP for Blast Mitigation

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