Ballistic performance maps for thick metallic armour

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Ballistic performance maps for thick metallic armour

Srivathsa, B. / Ramakrishnan, N.

This paper presents a concept for generating a certain type of Ballistic Performance Map (BPM) to assess the armour quality of metallic materials without resorting to expensive and time-consuming experiments. The maps are essentially based on a Ballistic Performance Index (BPI), developed by Srivathsa and Ramakrishnan in an earlier work, which describes the performance of a typical metallic armour in terms of the static mechanical properties of the material and the striking velocity of the projectile. The correlation is derived assuming an energy-balance approach and a two-stage penetration mechanism where the armour experiences radial flow at the striking end and bulging at the rear. The maps provide iso-performance contours as a function of the yield strength and the strain-hardening rate for a given striking velocity. To demonstrate the validity of the maps, those pertaining to steel (mild steel, maraging steel), aluminium (pure and alloyed) and titanium alloys (Ti-6Al-4V) are presented, along with experimental data. It is hoped that the simplicity and the applicability of these maps will greatly facilitate the development activity pertaining to metallic armour.