Recent Advances In Lagrangian Computations
For Ballistics Problems Involving Severe
Distortions
Author(s)
G. R. Johnson, R. A. Stryk, S. E. Ray & A. A. Johnson
Abstract
This article presents an overview of recent developments for Lagrangian
algorithms applied to ballistics problems involving severe distortions. The
primary development is a new algorithm that automatically converts highly
distorted finite elements into meshless particles during the course of the
computation. A large number of computations is provided to illustrate this
capability, including parametric computations that examine the response of a
small caliber projectile impacting a body armor component. The parameters
include the projectile velocity, the projectile core material, the target thickness
and the projectile impact point on the target.
Keywords: Lagrangian computations, finite elements, meshless particles, impact,
terminal ballistics.
1 Introduction
A characteristic of ballistics problems is that the material is often highly
distorted due to high-velocity impact and/or explosive detonation. During the
past years this has limited the classes of problems for which Lagrangian
approaches have been appropriate, because the traditional finite element grid can
represent only limited distortions. In recent years, however, there have been
significant improvements in material models, sliding/contact algorithms and
element formulations. Meshless particle methods have also been developed, and
some of these algorithms allow for very severe distortions in a Lagrangian
framework. Furthermore, some significant advantages have been achieved by
combining finite elements and meshless particles in the same problem.
Keywords
Lagrangian computations, finite elements, meshless particles, impact,
terminal ballistics.
Related Book
Other papers in this volume
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