Simulation an Eulerian approach to soil impact analysis for crashworthiness applications

The primary motivation of this study was the development and implementation of an explicit nonlin-ear dynamic finite element based methodology for investigating the crashworthiness of small lightweight rigid impacting into soft soil.The crash dynamics of aircraft are highly dependent on the characteristics of the impact terrain, as different terrains produce different structural responses. The technique used to characterise and validate a numerical model for soft soil as an impact terrain is the focus of this paper. The technique used was primarily based on the use of a time explicit Eulerian-based FE analysis code, and this technique was demonstrated through the FEA of penetrometer drop tests into soft soil. The Eulerian-based FE approach was considered rather than the more commonly used Lagrangian-based FE approach in order to reduce numerical insta-bilities which often occur with the use of Lagrangian solvers when considering problems with large deformations, which is a characteristic of crash analyses. These numerical instabilities may prematurely terminate analyses and compromise results.Explicit FE codes have been extensively employed in nonlinear transient dynamic analyses. In this simulation projectile was modeled as rigid body and soil as eulerian part. During the  analysis projectile is penetrated into the soil and crated a hole in the soil. You can see some figures of this simulation at below

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