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NCJRS Abstract

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NCJ Number: NCJ 234316     Find in a Library
Title: Device for Mechanically Folding Yarns and Woven Fabrics of Ballistic Fibers
Author(s): J. H. Kim ; N. Brandenburg ; W. McDonough ; W. Blair ; G. A. Holmes
Corporate Author: National Institute of Standards and Technology (NIST)
United States of America
Date Published: 01/2008
Page Count: 4
Sponsoring Agency: National Institute of Justice
US Department of Justice
Office of Justice Programs
United States of America
Sale Source: National Institute of Standards and Technology (NIST)
100 Bureau Drive
Gaithersburg, MD 20899-3460
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF 
Agency Summary: Agency Summary 
Type: Research (Applied/Empirical)
Language: English
Country: United States of America
Annotation: This report reviews the material testing of body armor.
Abstract: An apparatus was designed and built that attaches to servo-hydraulic machines that typically perform material fatigue testing. The device was designed to systematically fold woven fabric and yarns of ballistic fibers to assess the impact of mechanical folding, such as may occur during use, on ballistic fiber properties. Initial tests indicate that the device repeatedly folds a piece of woven fabric at the same location. However, when the device is in the open position, a consistent 1 cm movement of the fabric was observed. A slight modification of the apparatus is required to eliminate this movement. After cycling a piece of woven poly(benzoxazole) (PBO) fabric for 5,500 cycles, an 18 percent reduction in the ultimate tensile strength and strain to failure of the PBO fibers was observed. Research is continuing to determine a relevant and optimized testing protocol. (Published Abstract)
Main Term(s): Body armor/Personal protective equipment
Index Term(s): Testing and measurement ; Ballistics ; Protective equipment ; Mechanical equipment analysis ; NIJ grant-related documents
   
  To cite this abstract, use the following link:
https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=256271

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