In Reply to: 2N Hydraulics Update posted by Jack - Iowa on October 15, 2018 at 19:55:59:
The middle photo shows the story. It was an initial tensile fracture probably caused by a sudden stress(hitting a boulder). You can see the fatigue beach marks coming out of that initial sudden stress crack. Over time, the crack progressed in fatigue fracture while using implements for normal work until the part could no longer support the load. That resulted in tensile final fracture. I do this type of work everyday in the aircraft engine field. Sorry if I bored you with the details!