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    Yoeleo,Carbon Bike Parts Manufacture

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    pink2012
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    Yoeleo,Carbon Bike Parts Manufacture

    Post by pink2012 on Thu Sep 27, 2012 3:11 am

    Bike manufacturers usually start with
    carbon composites in one of two forms – prepreg or tubing. Carbon composite
    tubing is basically pre-cooked in a generic form that allows the manufacturer
    to cut the tube to size and glue it into lugs that can be made a variety of
    materials – including: carbon composite, steel, titanium, and aluminum. http://www.yoeleowheels.com/carbon-cycling-wheels-clincher-38mm.htmlThis
    method of construction can provide more leeway as far as building with custom
    frame geometry. However, lugged carbon construction doesn’t allow the builder
    nearly as much choice of tube shapes and sizes and doesn’t allow a level of
    integration equal to a monocoque, which can result in extra weight and material
    and concentrates stress at the weakest points of the frame – the bonded joints.


    http://www.yoeleowheels.com/carbon-racing-wheels-track-tubular-38mm.htmlPrepreg, the other main way of using composites, is short for
    “pre-impregnated”, and it refers to a sheet of filaments pre-impregnated with
    uncured resin. The prepreg is adhered to tack sheets like the backing on
    shelving paper so that it can be more easily handled. Properly handled sheets
    are stored in freezers to keep the resin from curing prematurely, and in
    production the sheets are cut and laid up in climate controlled rooms. http://www.yoeleowheels.com/carbon-wheels-cycling-track-tubular-88mm.html


    To give bike frames their structural
    strength manufacturers employ a variety of unidirectional carbon fiber prepreg
    sheets. Each sheet is designated by the fiber orientation as being either a 0°,
    a plus 45°, a minus 45°, and/or a plus or minus 30°. Each orientation
    bestows a different mechanical attribute to the structure. 0° sheets build
    strength and stiffness along the length of the structure. Plus and minus 30°
    sheets resist twisting, and the 45°’s fend off crushing loads. Together they
    determine the strength and stiffness of our little mechanical structure. http://www.yoeleowheels.com/track-bike-wheel-carbon-single-tubular-88mm.html


    Another word you’ll here often when
    researching composite bicycle frames is. Monocoque - meaning “a structure in
    which the shell bears most of the stress”- composite frames are molded using
    layers of prepreg in a very specific sequence and orientation. In practical
    terms, this means that large components of the frame (like the front triangle)
    are formed as a single integral piece. http://www.yoeleowheels.com/cheap-bmx-rim-20-carbon-clincher-single-50mm.htmlIf
    properly designed and built, this unified structure distributes dynamic stress
    over a wider portion of the moncoque – The easiest way to avoid stress
    concentration at the joints is to not have joint at all . Monocoques also allow
    the Ibisians more creativity in the forms they can design. Which - on the whole
    - delivers you a lighter, stiffer, and more stylie (in our humble opinion) ride. http://www.yoeleowheels.com/16-bmx-rim-carbon-clincher-single-50mm.html


    The sequence of prepreg layers is called
    “the lay-up schedule”, and is determined by a variety of methods. Lots of folks
    talk about how they employ FEA - finite element analysis - to develop their
    schedule, but what they don’t tell you is that FEA is only as good as the
    person who sets up the analysis. And the more complex the form or the material,
    the more difficult it is for FEA to give you useful information. http://www.yoeleowheels.com/bmx-carbon-rim-20-clincher-single-38mm.htmlComposite
    materials and the interesting forms it allows are very complex. We use FEA to
    develop the basic lay-up schedule, but then the artistry comes in. Our
    engineers go to our factory to build up sample frames and test them over and
    over until they find just the right ‘recipe’ that mixes the appropriate amounts
    of strength and stiffness at the lightest total weight.

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