04-01-13, 09:29 AM
(03-01-13, 05:42 PM)His Dudeness link Wrote: probably fatigue failure. maybe caused by a flaw in the material that wasn't visible on the surface. here's a bit about it http://en.wikipedia.org/wiki/Fatigue_%28material%29It's more likely to be caused by a stress raiser and the many heating and cooling cycles with a touch of work hardening. Due to the type of material used and the manner of manufacture the likelihood of a flaw is remote, although possible. There was definitely something other than use that caused it. Maybe the heat treatment during manufacture wasn't done correctly, maybe a stone hit it square on causing a little nick. I noticed this disc was showing slight corrosion around the periphery where the other side wasn't. Still, this is all conjecture and I am just pleased that it was found and wasn't a catastrophic failure