Joe’s Corner #7: Testing Carbon Fiber Filaments

Discussion of brand name filaments (ColorFabb Brand, NinjaFlex, Taulman, etc.)
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LePaul
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Joe’s Corner #7: Testing Carbon Fiber Filaments

Post by LePaul »

It's a short article but interesting...


http://3dplatform.com/joes-corner-7-tes ... filaments/
filaments.jpg
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Re: Joe’s Corner #7: Testing Carbon Fiber Filaments

Post by Amedee »

<grumpy mode on>
Mmmmmh...

I am really missing some data here. What has been tested? traction, compression, flexibility? In which direction? How many samples? what is the measurement unit?

(If he's using a force gauge I assume it is a traction test, and people using the word 'gage' are probably talking 'pounds', but still...)

Without the test protocol I'm afraid it's not very useful...
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Re: Joe’s Corner #7: Testing Carbon Fiber Filaments

Post by LePaul »

I was curious about his color coding...is green good?
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Re: Joe’s Corner #7: Testing Carbon Fiber Filaments

Post by Amedee »

No, green is weak, red is strong....
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Re: Joe’s Corner #7: Testing Carbon Fiber Filaments

Post by Anders Olsson »

Yeah, it would be more useful of there was some information about how the "strength" was measured and some absolute numbers instead of percentage compared to "house brand PLA".

The general opinion about carbon filled filaments is that they do not have higher flexural or tensile strength than unfilled ones (they will not take more load before they break than unfilled plastic of the same kind).
The flexural/tensile modulus will be higher when adding carbon fibers though, meaning that the printed object deforms/bends less under a certain load than the same object printed in pure plastic would.

The explanation for this is that the carbon fibers, while very stiff, are not long enough to entangle with each other, meaning the strength of the material is still limited by the "glue" which is the plastic in this case.

So I am curious about those tests Joe made, would be very interesting to see more data.
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