Hybrid Fiber Sizings for Enhanced Energy Absorption in Glass-Reinforced Composites

Report No. ARL-TR-3241
Authors: Robert E. Jensen, Steven H. McKnight, Dave P. Flanagan, Alan R. Teets, and Donovan Harris
Date/Pages: July 2004; 36 pages
Abstract: Achieving high-impact energy absorption without loss of structural performance in a glass fiber-reinforced composite can be obtained through a "materials by design" approach of the fiber matrix interphase through modification of current commercially formulated silane-based fiber-sizing packages. In this report, we document the structural and impact performance of composites produced using a fiber-sizing package designed to provide strong fiber-matrix bonding at low-impact rates and weak fiber-matrix bonding at high-impact rates. Additionally, enhancement of post-failure behavior at high-impact rates via increased absorption of frictional energy during fiber-matrix pullout was explored through control of the surface roughness and texture of the glass fibers. A unique inorganic-organic hybrid fiber-sizing formulation was successfully applied at a commercial E-glass manufacturing facility to produce rovings as well as woven fabric reinforcements. Composite materials were manufactured using these specialized fabrics, and the preliminary structural and impact energy responses of these materials have been measured.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2004