Accession Number:

ADA585967

Title:

Predictions of Helmet Pad Suspension System Performance using Isolated Pad Impact Results

Descriptive Note:

Conference paper

Corporate Author:

PROJECT MANAGER SOLDIER PROTECTION AND INDIVIDUAL EQUIPMENT HAYMARKET VA

Report Date:

2010-09-13

Pagination or Media Count:

12.0

Abstract:

The Advanced Combat Helmet ACH pad suspension system is the primary attenuator of low-rate blunt impacts to a Soldier s head. Quantification of pad suspension system improvements currently requires the costly and time consuming testing of an entire helmet. Two potential methodologies for independently testing pads were assessed using four existing pad designs. One of these methodologies used a flat anvil impact surface, and the other used a modular elastomer pad MEP impact surface. Independent pad testing was conducted at three environmental and four impact velocity conditions. These test results were compared to those from complete helmet tests under the same environmental conditions and three of the four impact velocity conditions. This comparison shows that ambient 295 oK temperature, 3.0 ms independent pad impacts on a MEP surface account for over 99 of the variation observed in ambient 295 oK temperature, 3.0 ms complete system impacts. Under the same conditions, the flat anvil impact surface results account for 92 of the variation seen in complete system impacts. Despite positive results under ambient conditions, independent pad impacts are not a useful predictor of pad suspension system performance under extreme high or low temperatures. For example, hot 327 oK temperature, 3.0 ms independent pad impacts on a MEP surface account for only 31 of the variation observed in hot 327 oK temperature, 3.0 ms complete system impacts. Under the same conditions, flat anvil impact results account for only 4.4 of the variation seen in system impacts. At extreme temperature conditions, interactions of the helmet or impact surface with the pad suspension system likely contribute significantly to the end result. Independent impacts become progressively less valuable as a predictor of helmet system results as the impact temperature condition becomes increasingly extreme, and future studies will assess alternative test setups that may eliminate t

Subject Categories:

  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE