Unidirected Twined-Strand Composites and Their Usesby Charles E. Kaempen, Kaempen Technology Inc, Anaheim, United States,
Abstract: Twined strand composites are a new class of unidirected continuous-fiber-reinforced composite materials where the orientation of the continuous fibers is a twine of unidirected helically configured strands instead of the collimated parallel strands that typify conventional unidirected fiber composites. The sinusoidal wave-like arrangement of twined filament strands not only increases the stiffness of unidirectional composite ply structures but also simplifies the fabrication of tubular composite structures having two or more biaxial plies. Analytical methods are provided to guide calculations of bending strengths and tensile strengths of composite plies made from unidirected twined strands. Tables are provided that give engineering properties and design values of composite twines and composite ply structures made from parallel twines.
Subject Headings: Composite structures | Fiber reinforced composites | Material tests | Construction materials | Fibers | Ultimate strength
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