σ_max = Δσ/2 + σ_m

ε_a=Δσ/2E +(Δσ/2K^')^1/n'

n' = b/c

K'=σ_f'/(ε_f') ^n'

Δε/2 = Δσ/2E + ( Δσ/2K^') ^(1/n')

ε_a=the strain amplitude

2N_f =Number of reversals to failure

σ_f' =the fatigue strength coefficient

ε_f'=the fatigue ductility coefficient

b =fatigue strength exponent (Basquin's exponent)

c =fatigue ductility exponent

n' is defined as Cyclic Strain Hardening Exponent

K' is defined as Cyclic Strength Coefficient