Low Velocity Perforation Design Of Metal Plates
Author(s)
N. Jones & R. S. Birch
Abstract
This article examines some recent experimental test data on the perforation of
mild steel plates having thicknesses 2 ≤ H ≤ 8 mm and struck by relatively heavy
masses travelling up to about 13 m/s. The plates are fully clamped around
circular, square and rectangular boundaries and struck by projectiles having
blunt, conical and hemispherical impact faces. It transpires that the
dimensionless perforation energies are smallest for the plates struck by the
blunt-faced projectiles and largest for the hemispherical ones. The perforation
energies are greatest at the plate centre and are smaller near to the supporting
boundaries. These latter effects are captured in an empirical equation for the
dimensionless perforation energy. This equation provides a lower bound to
almost all of the test data on the different plate geometries and impactor shapes
and is, therefore, a useful tool for design purposes.
Keywords: perforation, impact, circular plate, rectangular plate, blunt, conical,
hemispherical impactors.
1 Introduction
Many empirical equations for the impact perforation of ductile metal plates have
been developed over the years since Robins studied the problem in 1742.
However, most of these equations have been obtained using experimental data
from high velocity tests with relatively light missiles which are of particular
interest for military engineers. Nevertheless, there is a large class of practical
industrial impact problems which involve heavy masses travelling at relatively
low velocities. These impact loadings produce global deformations (e.g., large
transverse displacements of the plating) prior to perforation which contrasts with
the local shear failures, which often occur at the high impact velocities
associated with the existing empirical equations.
Keywords
perforation, impact, circular plate, rectangular plate, blunt, conical,
hemispherical impactors.
Related Book
Other papers in this volume
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