Abstract
Simulation of Soil-Structure Interaction becomes more and more the focus of computational engineering in civil and mechanical engineering, where FEM (Finite element Methods) for structural and soil mechanics and Finite Volume for CFD are dominant. New formulations have been developed for FSI applications using ALE (Arbitrary Lagrangian Eulerian) and mesh free methods as SPH method, (Smooth Particle Hydrodynamic). In defence industry, engineers have been developing protection systems for many years to reduce the vulnerability of light armoured vehicles (LAV) against mine blast using classical Lagrangian FEM methods. To improve simulations and assist in the development of these protections, experimental tests, and new numerical techniques are performed. To carry out these numerical calculations, initial conditions such as the loading prescribed by a mine on a structure need to be simulated adequately. The effects of blast on structures depend often on how these initial conditions are estimated and applied. In this report, two methods were used to simulate a mine blast: the classical Lagrangian and the ALE formulations. The comparative study was done for a simple and a more complex target. Particle methods as SPH method can also be used for soil structure interaction.
Highlights
Theoretical and experimental analysis of explosion mine loading have been considered by several researchers over the past decades, using empirical methods as CONWEAP (Conventional Weapon) code when the explosive charge is far away from the structure, and Lagrangian description of motion for near field.Different approaches have been explored in recent years to simulate the loading conditions generated by mine blast
smoothed particle hydrodynamics (SPH) methods are gaining in accuracy numerical stability, and the use of SPH method is becoming more common in industry for solving soil structure coupling problems
For decades engineers in aerospace industry were using arbitrary Lagrangian-Eulerian (ALE) method to simulate bird impact on aircrafts, where a viscous hydrodynamic material is used for the bird
Summary
Theoretical and experimental analysis of explosion mine loading have been considered by several researchers over the past decades, using empirical methods as CONWEAP (Conventional Weapon) code when the explosive charge is far away from the structure, and Lagrangian description of motion for near field. Lagrangian and ALE Formulations for Soil Structure coupling with Explosive Detonation. The aim of this article is to compare numerical results obtained using the two different formulations, the ALE and SPH with empirical and simplified methods using CONWEP, Westine, pressure-based mine loading models. The comparison was carried out for two scenarios and the obtained numerical results were compared with the experimental data. For this more complex scenario, several parametric studies were carried out for the ALE and SPH methods. A mesh sensitivity analysis was conducted for the ALE model, and the results obtained with several formulations of the particle approximation theory were compared. Parametric studies were conducted on both models and the best obtained results were compared to the experimental ones. Each comparison include the velocity at the center of the plate, sponson top and sponson sidewall
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