Numerical simulation of landmine explosions: comparison between different modelling approaches
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/192399
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Until decade ago the design of mechanical structures, having to resist to explosive
events, was mainly performed using experimental tests with explosive materials. In the last
years, numerical methods are assuming importance thanks to the following advantages: high
cost reduction, flexibility in investigating different scenarios and the chance to study
explosive phenomena without risks. An explosion is a complex and multidisciplinary subject.
It involves a large number of physical parameters which influence the amount of energy
transferred to the target above the detonation. The aim of this paper is to describe numerical
models to simulate landmine explosion and blast loading on structures, using different
approaches: an Arbitrary Lagrangian Eulerian (ALE) mesh and a pure Lagrangian mesh. For
what concerns the ALE simulations, three different cases are analyzed. First of all, the
numerical model of the landmine explosion is validated through the comparison with
experimental data. The same model is then used to evaluate the effect of detonations against
two structures, using a fluid-structure algorithm: a steel plate and a human leg. For this type
of simulations, an Eulerian approach is needed, in order to reproduce the expansion of the mix
of sand, air and gas against the target. When the gas encounters the target a fluid structure
interaction algorithm (FSI) determines the pressure values, which are transferred from the
Eulerian parts to the Lagrangian ones. The main disadvantage of an ALE approach is the large
computational time, which is further aggravated by the need to use quite fine mesh resolution
to adequately reproduce the air shock. For this reason it is interesting to use 2D modeling. The
second approach is based on empirical airblast equations developed by Kingery and Bulmash,
for the application of pressure loads due to explosives in conventional weapons, and was
implemented in LS-DYNA by Randers-Pehrson and Bannister. This methodology is applied
to simulate the detonation against the plate and the results are compared with the
corresponding results obtained using an ALE approach.
ISBN978-84-941407-6-1
Fitxers | Descripció | Mida | Format | Visualitza |
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Coupled-2013-62 ... simulation of landmine.pdf | 1,772Mb | Visualitza/Obre |