Best way to joint fabricated carbon strut structure.


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Tobias
Tobias
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Hi there,
I am pretty new to working with carbon, but have a good background in other materials.

I am working on designing a strutted framework, fabricated out of 5mm pultruded carbon tube, and I thought it best to seek some advice about how best to make the joints. My plan is to build a jig which holds everything flat, and use a braided sleeve to form a reinforced skin. However since I also plan on painting the structure, I don't necessarily need the braid for aesthetics, however I also don't want 'spider knees' at each join. 

To simplify things, lets assume i am building a small chair, with some structural triangulation, which needs to hold about 10kg ( so in real world terms I guess it has to be over-engineered to not fail under 50kg, or something of the kind ).

In my crude drawing I have 3 potential jointing processes, but I wonder if there is another I have not considered, or if I would be better off making a mould and a core, and using a cast component joined by tubes, rather than attempting to join struts together. 

Thanks,
T
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Warren (Staff)
Warren (Staff)
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how big is the gap?? I have used ET515 personally for bonding inserts and its been a good bond.  You need to key the alloy properly. Some people go as far as putting grooves in or even knurling the end to be inserted.  

I guess you are using roll wrapped tubing?? Almost all roll wrapped tubes will come from the factory with a heavy coating of release agent still inside the tube, so you really need to ensure it is gone to get a good bond.

Some photos would be ideal.

If you're still having problems getting a good bond after that, then return us the glue and we will test it. It is theoretically possible to have a bad batch, although this has not happened to us yet.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
GO

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