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| Carbon-fiber reinforcement in laminate structures has resulted in great improvement in tensile strength, but much-less-than-theoretical improvement in compressive strength. Textron scientists have discovered that waviness reduces the compressive strength of the fibers. By bundling the ultra-small fibers into easily manageable resin-matrix rods or shapes, and holding those fibers in tension while the resin sets so that the carbon remains as straight as possible, Textron has demonstrated that highly aligned fibers in rod form can dramatically reduce the amount of fiber waviness inherent in carbon/epoxy prepreg tape laminates. For highly unidirectional laminates, or parts with highly directional loading, carbon/resin pultruded rods can eliminate the knockdowns due to waviness, porosity and other defects common to typical carbon/epoxy laminates and structure. In addition, carbon/resin rod layup into composite structure has been demonstrated to be easily automated for insertion to aircraft structural wing and fuselage structure at Textron. Layers of rods can easily be applied to new techniques in the transfer molding (RTM, VARTM, etc) process, braiding process, injection molding, compression molding, and others. The locked-in, fiber alignment makes the carbon/resin pultruded rod or shape very applicable for applications including tethers, sailboat rigging, control rods and even kite cross-members!Reinforcing skins structures against stress tension common ranges steel rods fresh concrete (buildings) glass fibers embedded resin (boat hulls) carbon-fiber laminations (aircraft spacecraft) composite materials matrix light weight applicable transfer molding resin-injection fast relatively inexpensive |
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