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The Tensile Properties of Three Dimensional Air Textured Aramid Reinforced Composites

[+] Author Affiliations
Thomas Brice Langston

North Carolina State University, Raleigh, NC

Yiping Qiu

Donghua University, Shanghai, P. R. China

Paper No. IMECE2003-55526, pp. 77-81; 5 pages
doi:10.1115/IMECE2003-55526
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Textile Engineering
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Textile Engineering Division
  • ISBN: 0-7918-3729-7 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Air-textured aramid yarns (ATAY) and regular aramid yarns (RAY) were used in this study to fabricate 3D orthogonal woven composites. The composites were tested in warp, weft, and 45° directions to determine the engineering constants of the composites. The ATAY composite had a much lower fiber volume fraction than the RAY composite due to the bulkiness of the textured yarns. With the same fiber volume fraction, the ATAY composite had a slightly lower tensile strength and modulus, but a 120% higher in-plane shear modulus, than the RAY composite. Unlike the RAY composite that demonstrated a brittle failure, the ATAY composite failed in a ductile manner with multiple diverting cracks propagating during failure. The ATAY composite had a much higher yield point in the 45° direction tensile test and a much higher softening point in the warp direction tensile test than the RAY composite. The loop entanglements of ATAY are responsible for all the improvements observed in this study.

Copyright © 2003 by ASME

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