SEP 2018


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SEPTEMBER 2018 44 CompositesWorld FEATURE / Safe Cycling because of the higher elongation fibers," Ohlsson contends. "If there is a failure in a handlebar, the composite does not break completely but stays held together, minimizing the risk to hit your nose on the ground. Instead you could still maintain control of the bike until full stop." Oxeon spreads 12K (and greater) carbon tows, and report- edly can tailor biaxial or hybridized plies, or other UD or multi- directional fabric materials. e company works closely with its customers to help identify and optimize customer require- ments. Ohlsson says the spread-tow fabrics also drape better than standard UD tapes around double curvatures or square shapes, yet still present the mechanical performance of cross-plied UDs. He adds, "We can tailor the fabric to change a four-ply UD layup into one fabric ply, possibly with different amounts of fiber in warp and weft, that gives exactly the requisite number of 0° and 90° fibers while still presenting a symmetrical layup." (Fig. 5, p. 47.) TeXtreme is used by bike manufacturer Masi Bikes (Vista, CA, US) for its new frames and forks, reducing fabric weight by 100 g/m 2 while improving stiffness. "e goal wasn't to just make the frame lighter, we also wanted to make it a bit smoother without giving up any drivetrain stiffness. e material is so thin, we could work with several plies to get the same thickness or less, resulting in signifi- cant improvements," says Masi's product manager James Winchester. Bike gear manufacturer PRO (Eind- hoven, e Netherlands) makes its PRO Vibe handlebars with the same material. Weighing 220g, PRO Vibe carbon fiber composite handlebars are now the lightest in the PRO line up, and Innegra fibers "strengthen the bar's most vulnerable areas without compromising its weight, so your handlebar is ready to ride in the harshest conditions," Pro states. Sam Pickman, director of product/engi- neering for Allied Cycle Works/HIA-Velo, emphasizes the advantages of selectively adjusting the ratio and composition of carbon and thermoplastic fiber content in the layup to pinpoint the desired between performance/weight/cost balance for each bike model. "For a laminate that has its eye on price," he notes, "we use a combi- nation of standard-modulus UD [carbon fiber] prepreg in 150-g/m 2 weight, a quasi- isotropic stack from Vectorply Corp. [Phenix City, AL, US], and Innegra in key locations to add damage tolerance and toughness." To build a super-lightweight layup that takes advantage of thermoplastic fatigue- and damage-tolerance benefits, Pickman uses an intermediate-modulus 100-g/m 2 UD prepreg with a TeXtreme/Innegra hybrid material to add toughness. For its production Alfa all-road bike, Allied uses about 1m 2 of 150-g/m 2 Innegra prepreg weave in areas of the bike "that are at high risk of impact," says Pickman. But the majority of the layup, he says, is 150-g/m 2 standard-modulus UD prepreg (Mitsubishi Composite Materials Div., Irvine, CA, US). For its coming Alfa X, "we are using the 166-g/m 2 TeXtreme/Innegra as the outermost ply for the entire bike, with the base layup as 110-g/m 2 intermediate- modulus UD Mitsubishi fiber, both prepreg." 2675 Main Street • PO Box 873 • East Troy, WI 53120 USA • • 262-642-3938 Wisconsin Oven is a brand of Thermal Product Solutions, LLC Interior Thermocouple Jack Panel & Vacuum Stubs Interior Supply and Return Ducts with Interior Lighting Pressure Transducer Monitoring Lines Vacuum Piping System w/ Pressure Transducer & Thermocouple Jack Panel Your Composite Curing Oven Specialists Wisconsin Oven Premium Data Acquisition and Control System

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