Fatigue Pictures

Basic Fatigue Models/Approaches

Basic Fatigue Regimes

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Basic Fatigue Models/Approaches


Stress-Life Approach(S-N) - for high cycle fatigue applications


Strain-Life Approach(e-N) - for low cycle fatigue situations. Good for crack initiation stage.

The Linear Elastic Fracture Mechanics (LEFM)Approach - for low cycle fatigue Good model for crack apropagation stage.




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Basic Fatigue Regimes


Low Cycle Fatigue (LCF) Regime - for N<= 1000 cycles to fracture.


High Cycle Fatigue (LCF) Regime - for N>= 1000 cycles to fracture.


N=Ni + Np= crack initiation cycles + crack propagation cycles.



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