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Low cycle fatigue vs High cycle fatigue | Difference between Low cycle fatigue and High cycle fatigue

This page compares Low cycle fatigue vs High cycle fatigue and mentions difference between Low cycle fatigue and High cycle fatigue.

What is Fatigue?

Introduction:
• Failure occurrence due to dynamic and fluctuation loading is called fatigue.
• Fatigue has become more common due to use of greater amount of equipments and structures in the development of bridges, automobiles, pumps, turbines etc.
• It is stated that fatigue accounts about 90% of all service failures due to mechanical causes.
• It usually occurs after lengthy period of repeated stress or strain cycle.
• Following factors are causes of fatigue failure viz. maximum tensile stress of high value, large enough variation in applied stress, sufficient large number of cycles of applied stress.
• Fatigue behavior can be classified into two domains viz. low cycle fatigue and high cycle fatigue. The figure-1 below depicts the same.

Low cycle fatigue

Following are the characteristics of Low Cycle Fatigue.
• It is associated with relatively high loads.
• It produces elastic strain as well as plastic strain during each cycle.
• This type of fatigue lives are relatively short.
• Low cycle fatigue domain occurs at less than 104 to 105 cycles (N < 104 to 105 cycles).

Difference between Low cycle fatigue vs High cycle fatigue

High cycle fatigue

Following are the characteristics of High Cycle Fatigue.
• It is associated with lower stress levels.
• In high cycle fatigue, deformations are totally elastic.
• This type of fatigue lives are relatively longer.
• In this type, large number of cycles are needed to produce fatigure failure.
• High cycle fatigue is associated with fatigue lives greater than 104 to 105 cycles (N > 104 to 105 cycles).



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