Additive Continuous Tows Preform for Fiber Angle-Optimized Composite Tube
摘要
Many continuous carbon fiber-reinforced (CCFR) composite tubes are manufactured using filament winding of resin impregnated tows. While such manufacturing method allows variation in fiber angle along the length, low axial angles (<40 \(^\circ \) ) are hindered because the tows slide along the circumference during fabrication. This manufacturing constraint limits longitudinal placed tows and high axial stiffness. Other methods like infusion of woven preforms are available in limited tow angles and cannot readily vary fiber angles. Currently, the ability to vary tow angles along the length of tubes to optimize for specified loading conditions is limited to capital-intensive slow fabrication processes such as automated fiber placement (AFP) or labor-intensive hand layup. Here, we investigate a new method of composite tube manufacturing in which Continuous Fiber 3D (CF3D®) additively manufactured tow preforms are printed and rolled onto a mandrel before cure. This method of manufacturing allows variation of fiber angles along the length of a composite tube and enables fiber placement parallel to the longitudinal axis (0 \(^\circ \) ). Through this work, we optimize the fiber angles along the length and thickness of the tube for compression strength and compare with other variations of fiber architecture including published results of optimized filament-wound composite tube.