Numerical Modeling of Fragmentation Warfead Using ALE Feedback

Abstract

The article presents introduction to numerical simulation of directed fragmentation warheads used for destroying projectiles with shaped charges. There are several methods for numerical modelling of such a phenomenon. One of the most common methods is to use Arbitrary Lagrangian-Eulerian (ALE) method alongside with fluid-structure interaction (FSI). Fragmentation warhead, in the form of 100 mm length cylinder with 80 mm diameter, consists of four main parts: internal and external case, explosive material, and fragmentation liner. Fragmentation liner is built from resin with submerged metallic spheres. After detonation, the liner fragments into many parts. Flight of the debris is characterized by a number of key values such as speed of the debris or their distribution in space. A three-dimensional model of a fragmentation warhead was prepared using Hypermesh software and numerical analyses were performed using LS-Dyna software. As a result of numerical analyses, the maximum velocity of the fragmentation liner and spatial distribution of fragments were determined.

Keywords

• mechanics
• finite elements method
• dynamics
• directed fragmentation warhead