ExLO: A three-dimensional total shock physics FEM code

Abstract

A unified shock physics code, ExLO, in which Lagrangian, ALE and Eulerian solvers are incorporated into a single framework, has recently been developed in Korea. It is based on the three-dimensional explicit finite element method and written in C++. ExLO is mainly designed for the calculation of structural responses to highly transient loading conditions, such as high-speed impacts, high-speed machining and explosions. In this paper the numerical schemes are described. Some improvements of the material interface and advection scheme are included. Details and issues of the momentum advection scheme are provided. Numerical predictions are in good agreement with the existing experimental data. Specific applications of the code are discussed in a separate paper in this journal. Eventually, ExLO will provide an optimum simulation environment to engineering problems including the fluid-structure interaction problems, since it allows regions of a problem to be modeled with Lagrangian, ALE or Eulerian schemes in a single framework.

Modeling high-speed impacts and explosions with ExLO code

“…Two mixture theories studied are the equal strain rate model and linearized pressure equilibrium model. More details are included in a separate paper in this volume [1]. To demonstrate the capabilities of ExLO, we simulated a variety of problems of interest in the high-speed impacts and explosions.…”

“…This code is called ExLO. To validate the schemes a benchmark problem such as Taylor impact of a copper rod was already well compared with the existing experimental data [1]. In this paper, modeling with ExLO is presented for computing highly transient dynamic problems of two extreme areas such as munition-target impacts and explosions.…”

“…One special feature of the code is that the Lagrangian, ALE and Eulerian schemes are integrated into a single framework. The details of the numerical schemes are described in a previous paper [1]. In this paper, the modeling capability of ExLO has been described for two extreme loading events: high-speed impacts and explosions.…”