Quote:
Originally Posted by Ultramaroon
^^^this
How much design factor to account for scratches/divots? Stress risers lower actual critical speed.
Also interesting but might be coincidental, the failure occurred approximately where the stock driveshaft is divided.
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An engineer who helped me with the car afterwards made a similar point about the location of the fracture along the shaft, saying it was at/near the shafts maximum stress point (or words to that effect),
Our first reaction was some simple sort of impact fracture (at some point), but our gut feeling is that there may be some other factors at play.
Somewhat counterintuitive is the overall condition of the carbon, which is almost completely umarked (to the eye) along its length. * aside from the large scrapes and marks which correlate to hits taken as it spun free of the gearbox, and then being towed off the track.
Of course having said all that, it was always a risk running carbon on this car!