Carbon Fibre frame

[northwind]

Originally Posted by Ceri JC

As YC says, I think he's refering more to the consequences of your frame suddenly snapping at 180, rather than 35.

Yep, but since you're frame's under barely more stress at 180mph than it is in the garage, not an issue. Unless you're road racing of course in which case... Well, you're mad, so you might get a carbon fibre frame anyway

Originally Posted by northwind

Yep, but since you're frame's under barely more stress at 180mph than it is in the garage, not an issue...

Gone for a couple of days and all of the laws of physics have flown the coop.

I won't argue with you... but I will ask that you please explain that statement.

...

[northwind]

What extra high stresses do you believe it's under? What will cause a sudden critical failure?

Answers a question with a question.... I guess that you don't have the faintest idea and compose your response to divert attention from that.

How about...
engine torque of a lump at full song? Something is restraining that engine and the first stop is the frame.
....vibration induced by road surfaces, aerodynamics, and all of those unequalised rotating masses?
....the sometimes conflicting gyroscopic effects of the two largest rotating masses - even travelling in an (almost) straight line in the real world?
...suspension loads or are you riding around on billiard tables?
...the asymmetrical load paths of the drive train which conspire to twist the frame?
...the aerodynamic loads which ultimately are passed back through the frame to the rear wheel?

I could go on...

Loads will be transmitted through the stiffest path. In a normal composite structure that would be through the fibres. With a compromised and repaired structure the bandage can easily become the stiffest local part, but without the continuity of fibre the "glue" line between the patch and part becomes a critical path.

........

Easy guys! From a layman's point of view and I must admit I'm not an authority on the subject, you guys are comparing two frames which have some things in common and some other major differences in mostly weight and torque stresses.

The bicycle frame is majorly supporting the rider's weight and the torque force applied by said rider's pedaling. The road's uneven surface is introducing additional stresses to the bike's frame.

The motorcycle on the other hand has the same problems as the mountain bike but with additional weight and torque from an engine producing a bit more power than a cyclist. SO similar forces but much multiplied on a motorcycle.

My mind is telling me that maybe a material may be quite a good candidate for a lighter less stressed mountain bike but maybe cannot be directly compared with a motorcycle having much more weight and stresses.

Just look at the geekyness of this thread and people have the gall to quote us computer tech's as geeks... wow.

I notice that geeks marry the most beautiful girls pal!

Zunkus,

I have stayed away from the MTB/MC frame comparison. My only objection is to the whole notion that carbon frames would be repairable in the manner described.

Going back to your original post, I don't think that we will be seeing "shattered" frames if/when we see these things on the road. One just has to look at what F1 does to their monocoque chassis' should be a fair indication of the state of carbon construction - bits go flying everywhere but the chassis remains intact. Boeing and Airbus are both using carbon in more and more critical structures - these aircraft are repeatedly subjected to high loads (but well known loads) and will be expected to put in 1,000,000 service hours. Bits falling off aircraft have taken aircraft down so it would be unacceptable having carbon components failing in service.

Cheers

[yorkie_chris]

The bit I wonder about is interfacing with metal mechanical bits. How do they do that? Just set a bit of metal into it?

Originally Posted by Grinch

Just look at the geekyness of this thread and people have the gall to quote us computer tech's as geeks... wow.

Coding/compiling as I read the forum... got a gorgeous lady too.

Cheers