06-03-2011, 06:52 PM
kj wrote: Mine happened over a rocky section of trail that utilized all available travel on my shocks. I guess that's sort of fatigue, but not really.
No, there is no "sort of" about metal fatigue. It either is or it isn't. As I stated above, metal fatigue is a very specific term that describes the lowering of a metal's yield strength due to cyclic loading. It is possible that your frame was already suffering from fatigue effects which made it more susceptible to a failure due to a traumatic impact, but dropping off a cliff could easily exceed the yield strength of any frame material even if it was not fatigued.