Originally Posted by
Mojo31
Actually, I’d be more concerned about the galvanic corrosion caused by the contact between the carbon threads and metal fastener:
Despite all of the excellent properties of CFRCs, there are issues with using carbon fiber reinforced compositesand metals together. The carbon fibers in CFRPs cause this material to become electrically conductive. The carbon fibers are electrically conductive and electrochemically very noble. Therefore, when a metal is electrically connected to a CFRP, it is more susceptible to galvanic corrosion. (To learn more about galvanic corrosion, read An Introduction to the Galvanic Series: Galvanic Compatibility and Corrosion.)
https://www.corrosionpedia.com/galva...olymers/2/1556
I’ve had experience with fastening fittings to carbon fiber sailboat masts and booms. Tapping and threading directly into CF does not make for a connection that is very durable. Better to bond a threaded insert to the carbon with an epoxy. At least that’s been my experience.
When it comes to machining threads directly into carbon, it can be done successfully if the right sort of carbon fibre is used in the design e.g. discontinuous fibre in an epoxy matrix. it's certainly not a good idea to just tap a hole into any random carbon fibre laminate. I presume Lemond have taken all this into account in the design of the carbon structure to make it machining friendly.