A Novel Lightweight Sandwich Panel With
Substantial Resistance To Ballistic Penetration
Author(s)
T. Farquhar & R. Marlowe
Abstract
The goal of this study was to develop a lightweight structural panel that also
provided substantial resistance to ballistic penetration. Conventional sandwich
structures consist of a low density core laminated between thin stiff facing
sheets. Their specific flexural stiffness can be very high but their out-of-plane
impact strength is typically so low as to barely slow a high-energy projectile. In a
new configuration examined here, the standard core has been replaced by a novel
hybrid structure that can redirect or dissipate most of the incoming projectile’s
energy. This new core consists of woven Aramid textile loosely anchored to the
facing sheets by slender sacrificial pins. A numerical model of this structure was
evaluated using Abaqus Explicit Nonlinear software. The initial phase of
parameter study focused on the combined effects of pin modulus and strength.
Various metrics were used to assess the simulated efficacy of armour test panels
struck by a 5.66 mm (0.233 calibre) bullet travelling at 300 to 900 m/s (1000 to
3000 ft per s). The salient result was that the optimal choice of pin properties
varied according to the chosen metric. For example, stiff weak pins maximized
energy dissipation but stronger pins minimized backface deflection and softer
pins minimized peak fabric stress. The overall pattern indicated that a pinned
ballistic fabric core could, when suitably scaled, provide far better ballistic
protection than standard core materials, with minimal weight or cost penalties.
Keywords: ultralight armour, sandwich structure, ballistic impact, finite
element modelling, Abaqus, hybrid core, plain weave, sacrificial pins.
1 Introduction
The objective of this research was to develop a lightweight composite structure
that could also provide substantial resistance to ballistic penetration. The initial
Keywords
ultralight armour, sandwich structure, ballistic impact, finite
element modelling, Abaqus, hybrid core, plain weave, sacrificial pins.
Related Book
Other papers in this volume
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