A simple coupling of ALE domain with empirical blast load function in LS-DYNA

Gilson, L.; Roey, J. Van; Guéders, C.; Gallant, Johan; Rabet, L.

doi:10.1051/epjconf/20122604018

Cited by 7 publications

(2 citation statements)

References 1 publication

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“…However, the pressure curve generated by different parameter combinations were not promising. The LBE-ALE method, which applies the ConWep predicted blast wave on an ambient layer, predicted promising blast wave pressure history curves [28,29], but a recent work [30] showed that the blast pressure history is affected by the expansion wave initiated at the sides of the air domain, leading to rapid decrease in the pressure wave. Other studies [31][32][33] did not compare blast pressure wave with experimental data or only showed the pressure history within the ambient layer, which is not relevant, as the pressure wave can change significantly as it transits from the ambient layer to the air mesh.…”

Section: Coupled Load Blast Enhanced and Ale (Lbe-ale)mentioning

confidence: 99%

An assessment of blast modelling techniques for injury biomechanics research

Ghajari

2019

Numer Methods Biomed Eng

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Blast-induced Traumatic Brain Injury (TBI) has been affecting combatants and civilians. The blast pressure wave is thought to have a significant contribution to blast related TBI. Due to the limitations and difficulties of conducting blast tests on surrogates, computational modelling has been used as a key method for exploring this field. However, the blast wave modelling methods reported in current literature have drawbacks. They either cannot generate the desirable blast pressure wave history, or they are unable to accurately simulate the blast wave/structure interaction. In addition, boundary conditions, which can have significant effects on model predictions, have not been described adequately. Here, we critically assess the commonly used methods for simulating blast wave propagation in air (open-field blast) and its interaction with the human body. We investigate the predicted blast wave time history, blast wave transmission and the effects of various boundary conditions in 3 dimensional (3D) models of blast prediction. We propose a suitable meshing topology, which enables accurate prediction of blast wave propagation and interaction with the human head and significantly decreases the computational cost in 3D simulations. Finally, we predict strain and strain rate in the human brain during blast wave exposure and show the influence of the blast wave modelling methods on the brain response. The findings presented here can serve as guidelines for accurately modelling blast wave generation and interaction with the human body for injury biomechanics studies and design of prevention systems.

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Section: Coupled Load Blast Enhanced and Ale (Lbe-ale)mentioning

confidence: 99%

An assessment of blast modelling techniques for injury biomechanics research

Ghajari

2019

Numer Methods Biomed Eng

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“…Recently, the use of the CONWEP (Hyde 1991) blast-loading model [based on Kingery and Bulmash (1984) and/or TM 5-855-1 (Technical Manual 1986)] has gained popularity due to its inclusion in the advanced numerical tools such as ABAQUS (e.g., Mougeotte et al 2010; Lahiri and Ho 2011; Markose and Rao 2017) and Dyna2D and Dyna3D (Randers-Pehrson and Bannister 1997). A similar empirical blast model is also implemented in LS-DYNA (e.g., Neuberger et al 2007;Gilson et al 2012;Tabatabaei and Volz 2012). However, researchers (e.g., Le Blanc et al 2005) also realize that even such empirical tools have significant limitations and are applicable to only nonnuclear weapons.…”

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confidence: 99%

Probabilistic Characterization of Nuclear-Blast Loads

Pathak

Ramana

2020

J. Struct. Eng.

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With increasing stockpiles of nuclear warheads, it has become essential to fortify critical infrastructure against nuclear blast. 5 Therefore, a reliable estimation of nuclear-blast load is crucial for design of such hardened facilities. Several previous studies analyzed 6 nonnuclear explosion scenarios without specific attention to nuclear explosions. In this paper, 2 a standard nuclear-blast model from the liter-7 ature is compared with the declassified nuclear test data, and it is observed that the standard model reasonably captures the mean trend of the 8 decay portion of the air-overpressure history. This study accounts for the uncertainties associated with (1) the standard model, (2) occurrence 9 of an explosion, and (3) inherent variability of nuclear-attack parameters (range, yield, and height of burst) by (1) comparing the field data 10 with the model estimates, (2) developing a probabilistic threat scenario model, and (3) assigning appropriate probability distributions to the 11 nuclear-attack parameters, respectively. The incorporation of these uncertainties into the standard model leads to the probabilistic charac-12 terization of nuclear-blast loads. For direct use in design, two simple equations are proposed for peak overpressure and positive phase duration 13 in terms of probability of exceedance, and an equation is proposed that represents a normalized air-overpressure history.

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