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International Journal of Scientific & Technology Research

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IJSTR >> Volume 6 - Issue 8, August 2017 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Ballistic Characterization Of A Typical Military Steel Helmet

[Full Text]

 

AUTHOR(S)

Mohamed Ali Maher, Dr. Osama Mounir Dawood, Dr. Nabil El Houseiny Awad, Mahmoud Mohamed Younes

 

KEYWORDS

Areal density, Ballistic limit, FMJ 9×19 mm, Military standard, Shooting, Steel helmet

 

ABSTRACT

In this study, the ballistic limit of a steel helmet against a FMJ 9×19 mm caliber bullet is estimated. The helmet model is the typical polish helmet wz.31.The helmet material showed high strength low alloy steel material of 0.28% carbon content and 9.125 kg/m2 areal density. The tensile test according to ASTM E8 showed a tensile strength of 1236.4 MPa .The average hardness value was about HV550. First shooting experiment has been executed using a 9 mm pistol based on 350 m/s muzzle velocity at 5m against the simply supported helmet; complete penetrations rose in this test were in the form of cracks on the helmet surface, and partial penetrations were in the form of craters on the surface whose largest diameter and depth were 43 mm and 20.2 mm consequently .The second 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 to determine the ballistic limit velocity V50 according to (MIL-STD-662F). Three major outcomes were revealed; (1) the value V50 which found to be about 390 m/s, is higher than the one found in literature (360 m/s: German steel helmet model 1A1). (2) The smallest the standard deviation of the mixed results zone data, the most accurate the ballistic limit is. (3)Similar to the performance of blunt-ended projectiles impacting overmatching targets (t/D) near 1:1 or larger; It was found that the dominating failure mode of the steel helmet stuck by a hemispherical-nose projectile was plugging mode despite of having t/D ratio of about 1:9 (undermatching).

 

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