What's the difference between low cycle and high cycle fatigue?

Question

anonymous · Accepted Answer

low cycle - fewer number of cycles experienced by product
high cycle - product used for longer time, goes through more cycles

T · Answer

Low cycle: plastic deformation in each cycle, low number of cycles (finite endurance)
High cycle: elastic range, fatigue occurs above 10^3-10^4 cycles (S-N curve)

Anonymous · Answer

Low cycle means low frequency cycle
Example: when you have a rotating shaft bending back and forth
High cycle is when you have dynamic excitation and the part vibrates near the first mode

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