Penetration of Nylon Ballistic Panels by Fragment-Simulating Projectiles

Abstract

The main purpose of this report is to present an analysis of the ballistic behavior of the fragment-simulating projectile (FSP)-nylon cloth system. For a set of Vc determinations, plots of Vr versus Vs can be adequately represented by hyperbolas. The energy lost by an FSP after complete passage through a nylon ballistic panel of L layers is virtually constant, independent of the striking velocity. The hyperbolas lie on a portion of the surface of a hyperbolic paraboloid with Vr, Vs, and L as axes. The minimum penetration velocity of a missile that has reached the plane of the Lth layer is practically equal to the Vc (or V50) for L layers. The work of penetration per interior layer is essentially constant. For the interior layers, the average force and average deceleration per layer are approximately 1.03 times 104 N and 9.34 times 106 m/s2, respectively. This behavior holds for bonded (laminated) nylon ballistic panels, for the FSP-Kevlar system, and for the right-circular-cylinder missile/nylon system so far. Response surfaces are given for the FSP-nylon and FSP-bonded nylon systems relating ballistic performance to the diameter of the FSP, the firing obliquity, and the number of layers of cloth in the panel. The associated three-dimensional plots are also provided.

Modelling inter‐yarn friction in woven fabric armour

“…Prosser [16] analysed fabrics impacted by 0.22 calibre fragment simulating projectiles (FSP) and found that if slippage could be reduced by just four yarns at the impact point, an almost 50% 5 increase in protection could be achieved. Bazhenov [17] reported that in multiple-ply fabric systems, the ravelling of yarns at the unclamped edges is related to the energy transferred to 7 yarns in each fabric layer.…”

Modelling crimp in woven fabrics subjected to ballistic impact

“…8. It has been reported that increasing inter-yarn friction improves the ballistic resistance of woven fabrics [12][13][14][15]. With higher friction, it becomes more difficult for a projectile to push yarns apart and hence, they have to engage and break more yarns in order to perforate the fabric.…”

Investigation of the ballistic performance of ultra high molecular weight polyethylene composite panels

“…The author identified that the work of penetration per interior layer was constant. Penetration mechanisms were described in part II of his work [4], which is focused on providing more evidence that the major mode of failure of the Nylon panels impacted by the FSP were cutting and shearing mechanisms. Ballistic performance of Nylon 6,6 was also compared with the performance of Kevlar 29 in Figucia et al [5].…”