Evaluations Of Computational Techniques For
The Engraving Of Projectiles
Author(s)
J. South, B. Powers & M. Minnicino
Abstract
This paper presents research on the evaluations of computational methods used
to model the engraving of small caliber projectiles. The launch mechanics of a
5.56 mm projectile fired from a rifled barrel based on a M16A2 are examined in
this study. The interaction between small caliber projectiles and rifled barrels is
evaluated using finite element analysis (FEA) simulations utilizing the 3D
explicit dynamic FEA LS-DYNA code. The calculations were performed to
understand the interaction of the projectile during the initial portion of launch,
where the projectile is subjected to the dynamic pressure from the combustion of
the charge. The modeling parameters investigated include the order of element
integration, the hourglass control scheme, and contact algorithms. The stress and
strain state within both the projectile and the barrel are evaluated and compared
to experimental data. The results show that a comparison of global hourglass
energy to internal energy can lead to improper conclusions about the validity of
the engraving model. The choice of the hourglass scheme and contact algorithm
affects the hourglass energy and may affect the internal energy. This effort has
led to increased insight into the behavior of the engraving process on small
caliber projectiles and the numerical techniques necessary to reduce modeling
difficulties.
Keywords: engraving, projectile, hourglass.
1 Introduction
Correct simulation of the engraving process is crucial for the design of
obturation and prediction of in-bore dynamics. In addition, given realistic
constitutive models, consideration of the utility of different materials for the
bullet can be made. Unfortunately the engraving process is a difficult
Keywords
engraving, projectile, hourglass.
Related Book
Other papers in this volume
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