Quote:
Originally Posted by JDM4E
One question I always had about these pieces - does this compromise safety at head-on crash? Our car has 2-piece shaft with a joint, and IIRC this joint is designed as a point of failure during crash, so the engine can slide "under the cabin".
My concerns are about road-use since this will be super strong piece.
Thanks.
|
I was always under the assumption this was for NVH and costs but it could be for safety as well? I honestly have no idea.
No manufacturer of a one piece driveshaft will be testing a driveshaft in a head-on collision fashion, it's far too expensive. So I cannot comment beyond my speculation, which is below. But being a speculation, it is an opinion and from past experiences... not data.
The carbon tube would likely break in a compression loading scenario. I don't see a carbon tube surviving a crash if the engine gets pushed backward in the chassis. Carbon has great strength to weight but it does not buckle and remain intact like steel does when loaded past its yield strength.
Personally, what I see happening if this were to happen, would be the carbon tube disintegrating. Honestly, this would be much safer than a steel or aluminum shaft going downward into the concrete or upward into the cabin. Regardless, I believe the engine would be pushed backward "as designed" from the manufacturer. That's to say the manufacturers even design an engine to move rearward in a head-on collision... I have no idea what failure modes they assume, account for, and try to improve upon...
Regardless, do whatever you feel comfortable with and feel safe doing. I don't have the exact answer for you, beyond what I state above from my experiences with carbon and failure modes.
Thanks,
Eric
Quote:
Originally Posted by Falcon
Hey Eric!
What about high RPM Vibrations?
I would really like a lightweight driveshaft, but how good will it be going more than 200kp/h on the german Autobahns for al longer time?
Im mean round 125mph for more than 15min.
|
You should be fine
.
Thanks,
Eric