SUX United DC10
This accident was caused by fatigue of sorts.
There was a weakness in a small section of the titanium alloy from manufacture, I forget the exact number of flights but it was around the 17000 hour mark where the crack that had been forming hit 13 mm in length and this caused the catastrophic uncontained failure of the fan which in turn then led to the subsequent damage to all three hydraulic lines...so essentially it was fatigue related.