Effect of projectile nose shape on ballistic resistance of interstitial-free steel sheets

Abstract

In this paper an experimental and numerical work is reported concerning the process of perforation of thin steel plates using different projectile nose shapes. The main goal is to analyze how the projectile shape may change the ballistic properties of materials. A wide range of impact velocities from 35 to 180 m/s has been covered during the tests. All the projectiles were 13mm in diameter and the targets were 1mm thick, as such the projectile can be regarded as rigid and the target sheets were of interstitial-free (IF) steel. The mass ratio (projectile mass/steel sheet mass) and the ratio between the span of the steel sheet and the diameter of the projectile were kept constant, equal to 0.38 and 3.85 respectively. To define the thermoviscoplastic behaviour of the target material, the Rusinek-Klepaczko (RK) constitutive model [1] was used. The complete identification of the material constants was done based on a rigorous material characterization. Numerical simulations of some experimental tests were carried out using a non-linear finite element code ABAQUS/Explicit. It was found that the numerical models are able to describe the physical mechanisms in the perforation process with a good accuracy.

Experimental and Numerical Study of the Thermo-Viscoplastic Behavior of NICRO 12.1 for Perforation Tests

“…Beyond 175 m/s, mass inertial effects are important, i.e., no dependence on the projectile geometry is found in the residual impact velocity. This behavior has been observed in other research [ 5 , 29 ].…”

“…al. [ 9 ] and Kepenyigba et al [ 5 ], triaxiality depends on the projectile nose shape. Blunt projectiles produces a tensional state of shearing (triaxiality = 0), conical projectile produces a tensional state by piercing with a triaxiality of 1/3, and hemispherical projectiles produces a mixed tensional state (triaxiality = 2/3).…”

Numerical investigation on ballistic resistance of aluminium multi-layered panels impacted by improvised projectiles

“…It was shown that residual velocity after perforation was similar for a conical-and a hemispherical-shaped object, while the lowest value was found for a cylindrical projectile. Visible correlation between the projectile shape and the energy absorption capacity of a target was presented in the paper by Kpenyigba et al [34]. It was found that the hemispherical-nosed impactor was the least efficient, followed by conical and two double nosed.…”

The Ballistic Behavior of High Strength, Low Alloy-100 Steel at Sub-zero Temperatures

“…The value of the impact velocity at the point where the fitted curve intersects with the horizontal axis defines the ballistic limit which is shown by v 50 . Equation (3) is frequently used for determining the ballistic limits of materials [17,18]. The ballistic limit may be affected by the geometry of projectile and the target [19,20] and also by heat treatment of the material [21].…”