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.
The Tensile Properties of Three Dimensional Air Textured Aramid Reinforced Composites
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Langston, TB, & Qiu, Y. "The Tensile Properties of Three Dimensional Air Textured Aramid Reinforced Composites." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Textile Engineering. Washington, DC, USA. November 15–21, 2003. pp. 77-81. ASME. https://doi.org/10.1115/IMECE2003-55526
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