A device was designed and built that attaches to servohydraulic 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 movement of the fabric was observed. A slight modification of the device is required to eliminate this movement. After cycling a piece of woven poly(benzoxazole) (PBO) fabric for 5500 cycles, an 18% 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.
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January 2008
Design Innovations
A Device for Mechanically Folding Yarns and Woven Fabrics of Ballistic Fibers
J. H. Kim,
J. H. Kim
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
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N. Brandenburg,
N. Brandenburg
Fabrication Technology Division, Shops,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8250, Gaithersburg, MD 20899-8250
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W. McDonough,
W. McDonough
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
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W. Blair,
W. Blair
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
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G. A. Holmes
G. A. Holmes
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
Search for other works by this author on:
J. H. Kim
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
N. Brandenburg
Fabrication Technology Division, Shops,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8250, Gaithersburg, MD 20899-8250
W. McDonough
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
W. Blair
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541
G. A. Holmes
Polymers Division, Characterization and Methods Development Group,
National Institute of Standards and Technology
, 100 Bureau Drive Stop 8541, Gaithersburg, MD 20899-8541J. Appl. Mech. Jan 2008, 75(1): 015001 (4 pages)
Published Online: January 16, 2008
Article history
Received:
September 29, 2006
Revised:
May 14, 2007
Published:
January 16, 2008
Citation
Kim, J. H., Brandenburg, N., McDonough, W., Blair, W., and Holmes, G. A. (January 16, 2008). "A Device for Mechanically Folding Yarns and Woven Fabrics of Ballistic Fibers." ASME. J. Appl. Mech. January 2008; 75(1): 015001. https://doi.org/10.1115/1.2755131
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