Irvingthien wrote:I got a few questions here..
and why do they have to bond titanium with carbon, can't they just have carbon gearbox?
Composites, whether they be carbon, fiberglass, or Kevlar reinforced, have little strength in the Z direction, that being perpendicular to the fibers. This leads to delamination if the interlaminar stresses are too high.
Thay also have relatively low "bearing" strength, i.e. resistance to crushing when a contact force is applied.
Metals have neither of these problems. Therefore, the engineer is sometimes tempted to integrate metal into his design, especially in the case of bearing strength where bolted attachments and the like are required.
The delaminations mentioned earlier in the thread, and then possibly clarified as disbonds of a metal part from a composite part, are also affected by the stresses in the joint, as well as the temperature. So it could be a combination of the strength reduction due to temperature as well as the bond stresses that caused the failures.
And finally with regard to preparation of titanium for bonding, it is very finicky, but can be done, and can be successful, depending on the strength requirements. And of course weight (an dapparently not cost!) is one of the prime driving parameters in F1!!!!