The nature of metal fatigue can be discovered when building your RivKit. Metal fatigue can show up as a crack and parts broken apart when you bend the aluminum parts too many times. You can use metal fatigue to your advantage to break apart the individual parts from the RivKit tree. However, you can unwittingly break the parts when you bend them during assembly.
The aluminum alloy used to make the Rivkits is 5052. 5052 alloy accepts bending better than other alloys of aluminum. A single bend or an adjustment to a bend will not typically crack the part. If the part is bent multiple times in the same place, the part will crack.
