Resistance of M1 Helmets of Varying Thicknesses and of M1 Helmets Fitted with Plastic Liners to Perforation by the Soft and Hard Types of Caliber .45 M1911 Ball Ammunition

摘要

Ballistic tests conducted upon the fronts and backs of M1 helmets of varying thicknesses showed marked increases in ballistic resistance up to thicknesses of 0.035 in. to 0.037 in. above which thickness the increase was negligible. The front of the M1 helmet has a ballistic limit approximately 5% higher than the back. The plastic liner was found to behave in a brittle manner and to have no effect upon the ballistic resistance of M1 helmets. The replacement of the liner by an equivalent weight of steel in the helmet shell resulted in a considerable increase in the ballistic efficiency.