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Search Publications by: Jae Hyun Kim (Fed)

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Displaying 51 - 75 of 77

High Speed Fiber Testing: The Single Fold Test

May 20, 2010
Author(s)
Haruki Kobayashi, Walter G. McDonough, Alexander J. Shapiro, Jae H. Kim, Stefan D. Leigh, Amanda L. Forster, Kirk D. Rice, Gale A. Holmes
The failure of a first responder s body armor has prompted research to assess the long-term durability and effectiveness of current and future soft body armor products. Prior work in this laboratory described a 10 % drop in tensile strength and 15 % drop

The Effect of Environmental and Mechanical Mechanisms on the Performance of Soft Body Armor

July 27, 2009
Author(s)
Gale A. Holmes, Eun S. Park, Jae Hyun Kim, Walter G. McDonough, John R. Sieber, Haruki Kobayashi, Michael A. Riley, Kirk D. Rice
The use of high performance fibers (such as, poly[(benzo-[1,2-d;5,4-d ]-benzoxazole-2,6-diyl)-1,4-phenylene]1 (PBO), ultra-high molecular weight polyethylene2 (UHMWPE), and poly(p-phenylene terephthalamide)3 (PPTA)) in soft body armor (SBA) is well

Coordinated Fracture and Failure Initiation in Microcomposites

October 16, 2008
Author(s)
Gale A. Holmes, Jae H. Kim, Chang K. Moon, Walter G. McDonough
In this paper, the failure behavior of glass fiber microcomposites is investigated. E-glass fibers treated with an epoxy compatible sizing were embedded in a diglycidyl ether of bisphenol-A (DGEBA) resin cured with meta-phenylenediamine (m-PDA). Even

The Role of Folding in the Degradation of Ballistic Fibers

May 19, 2008
Author(s)
Walter G. McDonough, Gale A. Holmes, Jae Hyun Kim, Derek L. Ho
Research has indicated that the folding of ballistic fibers comprising soft body armor may be a factor in the performance deterioration that has been observed. To quantify the impact of this failure mechanism on body armor performance, an apparatus was

The Modified-Single Fiber Test: A Methodology for Monitoring Ballistic Performance

January 18, 2008
Author(s)
Jae Hyun Kim, Walter G. McDonough, William R. Blair, Gale A. Holmes
In an effort to develop a minimally invasive testing methodology for monitoring the in-service performance of soft body armor, the ASTM D3379-75 standard was modified by measuring the fiber diameter at 5 equally spaced locations along a 6 cm gauge length

A Device for Mechanically Folding Yarns and Woven Fabrics of Ballistic Fibers

January 7, 2008
Author(s)
Walter G. McDonough, Jae Hyun Kim, Nolan J. Brandenburg, William R. Blair, Gale A. Holmes
Abstract (2000 characters maximum - spell out acronyms the first time)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

An Apparatus For Folding Yarns And Woven Fabrics Of Ballistic Fibers

June 4, 2007
Author(s)
Walter G. McDonough, Jae Hyun Kim, Nolan J. Brandenburg, William R. Blair, Gale A. Holmes
Folding of ballistic fibers comprising soft body armor may be a factor in the performance deterioration that has been observed in used soft body armor. To quantify the impact of this mechanism, an apparatus was designed and built to simulate the folding

Estimation of the Interfacial Adhesion Strength in Compositional Libraries of Epoxy Films

February 22, 2006
Author(s)
Jae Hyun Kim, Martin Y. Chiang, D Kawaguchi, Gareth Royston, Christopher M. Stafford
At the NIST Combinatorial Methods Center (NCMC), we have designed, developed, and demonstrated a combinatorial approach to the edge delamination test to char-acterize the adhesion of thin polymer films. This test is based on fracture of a film/substrate

Cosolvent-assisted Spray Pyrolysis for the Generation of Metal Particles

July 1, 2003
Author(s)
Valeri I. Babushok, S H. Ehrman, Thomas Germer, Jae H. Kim, George W. Mulholland
A co-solvent assisted spray pyrolysis process was developed for the formation of pure metal particles from metal salt precursors without the direct addition of hydrogen or other reducing gas. Generation of pure copper and nickelparticles from aqueous

Measurement of the 100 nm NIST SRM 1963 by Laser Surface Light Scattering

November 1, 2002
Author(s)
Thomas A. Germer, George W. Mulholland, Jae Hyun Kim, S H. Ehrman
Accurate sizing of particles deposited on surfaces is important for the semiconductor, optical, and data storage industries. The recent availability of accurate light scattering models for non-ideal conditions enables the determination of particle size