Talk Composites - The Forum for Advanced Composites

Metal inserts - Carbon fiber layup

http://www.talkcomposites.com/Topic19155.aspx

By Trace Elliott - 9/9/2015 10:28:56 AM

Hello everyone,

I'm designing a drone, and I would like to be able to bolt two plates together (rather than use an adhesive, because if something breaks, I'd prefer to be able to change the piece that broke, rather than a whole assembly).
The plates would be 2-3mm thick, made by resin infusion.
To that effect (bolting plates together), I'd like to put a metallic insert in the lamination, prior to the infusion.
The insert would be a nut, essentially.
I know you can make the plate, then drill a hole and glue the insert, but I'd rather infuse the whole thing at once, if it's possible.

My question is: how do you put an insert in the fiber stack?
I read everywhere that you should have pins in the mould to accurately locate the inserts, but very little info on how to blend the insert in the fiber stack.

Should I spread the fibers apart? I'm thinking that won't look good
Should I punch a hole through the stack? Hello fibers everywhere...
Should I lay the first cloth and spread the others around the insert, and grind the first layer to reveal the insert?

If you have any ideas, please do tell :-)

Thank you very much!
By FLD - 9/15/2015 10:23:58 AM

Hanaldo (13/09/2015)
How thick a piece of metal are you using? I always think of sheet metal as being like 0.5 to 3mm thick, which isn't really enough for fasteners... Depends what loads the fastener sees, but the rule of thumb is you need at least 4 turns of thread for the fastener to be doing anything. 

I wouldn't be using anything less than 10mm.


The last one was a hard 4.5mm piece of alloy for an M4 thread.  Seems to have held up OK for the last year although it's not supporting anything massive, just a small header tank.