LWH & ACH Helmet Hardware Study

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 2015
Accession Number
ADA627203

Entities

People

  • Peter Matic
  • Ronald L. Holtz

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acceptance Tests
  • Ceramic Materials
  • Chemical Analysis
  • Chemical Composition
  • Chemistry
  • Chromium
  • Failure Mode And Effect Analysis
  • Grain Size
  • Impact Loads
  • Impact Tests
  • Materials
  • Materials Science
  • Screw Threads
  • Standards
  • Tensile Strength
  • Test And Evaluation
  • Test Methods

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Military Engineering.
  • Polymer Science and Engineering.