SPH-4 Helmet Retention Assembly Reinforcement

Abstract

The purpose of a helmet's retention assembly is to keep the helmet firmly and securely in place on the wearer's head, thus preventing the exposure of the cranium to direct impact. The standard SPH-4 retention assembly is prone to excessive elongation under stress, and allows excessive helmet displacement and cranium exposure. A modified SPH-4 retention assembly, reinforced with 0.75-inch tubular nylon webbing; was manufactured in this laboratory and tested quasi-statically on a testing machine which exerted a force at a constant speed. A standard SPH-4 retention assembly was also tested as a control. The reinforced retention assembly withstood a 450-lb load without failure. Elongation of the reinforced retention assembly, measured at 300-lb load, was almost 50 percent less than that of the standard retention assembly measured at the same load. Keywords: Retention system; Life support equipment; Chinstrap; Protective clothing.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA200432

Entities

People

  • J. L. Haley Jr.
  • Ronald W. Palmer

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Army Aviation
  • Artillery
  • Biological Sciences
  • Biomedical Research
  • Classification
  • Displacement
  • Engineering
  • Health Services
  • Materials
  • Military Research
  • New York
  • Protective Clothing
  • Security
  • Standards
  • Test Methods

Readers

  • Logistics and Supply Chain Management.
  • Military Engineering.
  • Reinforced Composite Materials