Carbon 3K / 12K / UD

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Carbon 3K / 12K / UD

Postby mikesbytes » Tue May 07, 2013 9:45 pm

Looking at a web site selling carbon components, they have the option of 3K or 12K or UD. There is no price differential.

Whats the difference between 3K / 12K / UD ?
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by BNA » Tue May 07, 2013 9:47 pm

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Re: Carbon 3K / 12K / UD

Postby ldrcycles » Tue May 07, 2013 9:47 pm

Coolness :lol: .

Wouldn't have a clue TBH.
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Re: Carbon 3K / 12K / UD

Postby DavidTomic » Tue May 07, 2013 11:13 pm

mikesbytes wrote:Looking at a web site selling carbon components, they have the option of 3K or 12K or UD. There is no price differential.

Whats the difference between 3K / 12K / UD ?


http://www.yoe <remove>leo.com/weave (Spam filter doesn't like that site for some reason?)
http://www.light-bicycle.com/the-3k-12k ... frame.html

Lots more sites / information if you just Google "3K 12K UD carbon fiber"
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Re: Carbon 3K / 12K / UD

Postby Mark Kelly » Wed May 08, 2013 12:20 am

UD = unidirectional, all the fibres are parallel so no weave pattern visible.

3k and 12k are types of weave, the number refers to the number of fibres in each tow of the weave (3000 and 12000).

12k weave has 1/16th the number of visible pattern elements per unit area.
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Re: Carbon 3K / 12K / UD

Postby AndrewBurns » Wed May 08, 2013 6:20 am

If they give you the option it's only for the surface 'cosmetic' layer and won't have any effect on the performance of the part. Basically UD = a more solid black finish, 3K = small chequerboard style finish, 12K = larger chequerboard style finish.
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Re: Carbon 3K / 12K / UD

Postby trailgumby » Wed May 08, 2013 10:11 am

Mark Kelly wrote:UD = unidirectional, all the fibres are parallel so no weave pattern visible.

Ummm... not quite. That would be monodirectional if they were all parallel.

Unidirectional means fibres go every which way in no organised pattern, as in uni = universal = everywhere.
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Re: Carbon 3K / 12K / UD

Postby mikesbytes » Wed May 08, 2013 10:43 am

So I shouldn't take any attention to this detail apart from what I think looks good. There's also the choice of gloss or matt

I'm thinking of getting a track front wheel as there is no braking and no drive stress plus the ride surface is much better. Hence there is little risk of wheel failure due to the quality of the manufacturing.
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Re: Carbon 3K / 12K / UD

Postby clackers » Wed May 08, 2013 11:17 am

Yeah, they talk about those patterns and they're associated with different strengths, but they're only the finishing layer, not structural.

Better not be. I've just ordered a Hongfu 26" frame to convert into my first dually!
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Re: Carbon 3K / 12K / UD

Postby AndrewBurns » Wed May 08, 2013 11:53 am

trailgumby wrote:
Mark Kelly wrote:UD = unidirectional, all the fibres are parallel so no weave pattern visible.

Ummm... not quite. That would be monodirectional if they were all parallel.

Unidirectional means fibres go every which way in no organised pattern, as in uni = universal = everywhere.


No he's right.

u·ni·di·rec·tion·al
/ˌyo͞onidiˈrekSHənl/

Adjective
Moving or operating in a single direction.

Synonyms
one-way

Unidrectional composite cloth has all the fibres aligned parallel in one direction, no such thing as monodirectional. You're thinking about omnidirectional.
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Re: Carbon 3K / 12K / UD

Postby Mark Kelly » Wed May 08, 2013 2:18 pm

trailgumby wrote:
Mark Kelly wrote:UD = unidirectional, all the fibres are parallel so no weave p,attern visible.

Ummm... not quite. That would be monodirectional if they were all parallel.

Unidirectional means fibres go every which way in no organised pattern, as in uni = universal = everywhere.


Sorry, that's completely wrong. Uno = one, unidirectional = all in one direction.

I have three types of UD CF on hand at the moment and in all of them the fibres are all parallel. The UD boron fibre prepreg I use also has all the boron fibres in one direction along the tape.

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image from http://specmaterials.com/boronprepregtape.htm

The fabric with randomly oriented fibres is known as "tissue", it is available in CF

Image

image fromhttp://www.acpsales.com/Carbon-Fiber-Tissue.html

but it's fairly rare. I've never worked with it whereas I have two weights of tissue in glass on hand. There's also a fabric known as quasi-isotropic which is approximately what you said, but it's actually made from a number of layers of UD oriented at angles to each other.
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Re: Carbon 3K / 12K / UD

Postby Crawf » Wed May 08, 2013 3:08 pm

For the generic Chinese manuf's, they all build their frames/rims in 3k, then offer the top layer finish in 3k/UD/12k (it's purely cosmetic) with a gloss or matte finish. 18k also seems to be becoming popular.
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