CF reinforced timber beam


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21TonyK
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Hello All. I'm looking for whatever info, advice or even just comments I can get on creating a laminated composite timber beam.
It's part of a student project comparing the structural properties of timber vs. laminated timber vs. laminated composite/timber 
The test beams are 1/4 scale so approx. 40mmx90mm and a metre long.

It would be simple enough to incorporate a single piece of pultruded CF but I'd like to try layers of cloth between each of the 10 timber lamellas.

Any suggestions on the composite material and resins or adhesives much appreciated!

Many thanks



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21TonyK
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Dravis - 6/1/2018 10:22:53 AM
Hi!

I have made several carbon-fibre reinforced "timber beams"  in effect they were raw "blocks" for cutting out the "core" of rifle stocks, and consisted of layers of 5 mm balsa-wood laminated with unidirectional Carbon cloth -using West Systems laminating epowy and vacuum bag consolidation, along with big "c-clamps"

The resulting ultra light weight "beam" was much stronger than conventional timber beams- even mulitple layered laminated beams made from Birch- of similar dimensions - and the beam stiffness was orders of magnitude better.
(They will however dull conventional band saw blades extremely quickly when you try to cut out the rifle-stock contours -- the owner of the band saw was not at all pleased with that :-|)

My take on this is that you would probably be able to make very stiff and strong beams using this simple tech -- but the CF inside the laminate will just be thin black lines, looking like black glue -- For decorative purposes you could laminate on an outer "bottom of beam" layer of wowen CF cloth.

I'm personally contemplating this for my new dining room table :-)
 


Sounds like its worth trying. I think I'll give the unidirectional cloth a go to begin with. Looks like I have several to make in various forms for testing.
GO

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