What is Low cycle fatigue failure and High cycle fatigue
failure? What are considerations of these while designing a
machine?
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Answer Posted / pradeep
Low cycle fatigue generally have less number of flight cycles to failure at high stress levels, fatigue cycles say about 10^3 cycles. But High cycle fatigue have more number of cycles to failure at low stress levels. >10^3 to say 10^8 cycles.
In High cycle fatigue since stress levels are less say at yeild limit of the material. The fatigue approach would be stress based. Whereas in Low cycle fatigue the fatigue failure is strain based approach.
Generally these machinary components and all fall in low cycle fatigue.
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