Accession Number : ADA627203


Title :   LWH & ACH Helmet Hardware Study


Descriptive Note : Memorandum rept. 18 Nov 2010-13 Jul 2015


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC


Personal Author(s) : Holtz, Ronald L ; Matic, Peter


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a627203.pdf


Report Date : 30 Nov 2015


Pagination or Media Count : 29


Abstract : NRL conducted a series of basic tests to characterize the properties of helmet screws and nuts used with the Light Weight Helmet (LWH) and Advanced Combat Helmet (ACH). The testing included basic dimensional measurements, Rockwell hardness and Vicker s microhardness measurements, metallographic examination of the grain microstructure, basic chemical composition, tensile strength, screw/nut thread pull strength, and a drop-weight impact test. Information was obtained for sets of screws and nuts taken from LWH and ACH helmets that have previously passed acceptance tests. This information is used as reference values for a series of recommended tests that can be applied to new batches of helmets or replacement screws, to detect any significant changes in the helmet hardware characteristics that could indicate a change of the ballistic performance.


Descriptors :   *HELMETS , *NUTS(FASTENINGS) , *SCREWS , ACCEPTANCE TESTS , BALLISTICS , CHEMICAL COMPOSITION , HARDNESS , IMPACT TESTS , LIGHTWEIGHT , MEASUREMENT , METALLOGRAPHY , MICROHARDNESS , PULL TESTS , REPLACEMENT , SIZES(DIMENSIONS) , STRENGTH(MECHANICS) , TENSILE STRENGTH , VALUE , WARFARE


Subject Categories : Test Facilities, Equipment and Methods
      Protective Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE