Accession Number:

ADA200432

Title:

SPH-4 Helmet Retention Assembly Reinforcement

Descriptive Note:

Final rept.

Corporate Author:

ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s):

Report Date:

1988-07-01

Pagination or Media Count:

23.0

Abstract:

The purpose of a helmets retention assembly is to keep the helmet firmly and securely in place on the wearers 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.

Subject Categories:

  • Protective Equipment
  • Life Support Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE