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Stress Life Calculations
Strain Life Calculations
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Strain-Life Without Mean Stress


The strain life equation for calculating fatigue life of a component is given by

εa= (σf'/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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