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References
Strain-Life : Morrows's Equation


Morrow's Equation strain life equation for calculating fatigue life of a component is given by

εa= ((σf' - σm)/E)(2Nf)b + εf' (2Nf)c

εa=the strain amplitude

εa=Δε/2

2Nf =Number of reversals to failure

E=Young's Modulus

σf'=the fatigue strength coefficient

εf'=the fatigue ductility coefficient

b =fatigue strength exponent (Basquin's exponent)

c =fatigue ductility exponent

εa
E MPa
σm MPa
σf' MPa
εf'
b
c
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