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Abstract
Abstract
In this study, the ballistic limit of a steel helmet against a FMJ 9×19 mm caliber having an approximate kinetic energy of about 600 joules at collision is estimated. The helmet type is the typical polish helmet wz.31. A numerical model was established and three materials were studied using Autodyne Hydrocode to choose a higher ballistic limit alternative among Iron-Armco, Steel-4340 and Ti-6Al-4V.
The ballistic performance of the helmet was determined by its V50 ballistic limit according to MIL-STD-662F standard. The experiment was on a rifled gun arrangement, 13 bullets of 9×19 mm caliber were shot on the examined simply supported steel helmet at a zero-obliquity angle at different velocities. The ballistic limit was found to be about 390 m/s. The numerical model resulted in 395 m/s ballistic limit for Ti-6Al-4V which is higher than the measured value of the helmet, while it is only 56 % of the areal density of the helmet material.
Keywords
Ballistic limit - Steel helmet - Shooting - FMJ 9×19 mm – projectile - areal density – hemispherical nose - Numerical modelling - mechanical & metallurgical testing