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Modified Godman Method Fatigue Curve Equation

Strength and Mechanics of Materials

Modified Godman Method 

Where:
= Amplitude of normal (shear) stress [MPa,psi]
= Endurance limit at constant strength [MPa,psi]
= Mean cycle stress [MPa,psi]]
= Virtual mean stress [MPa,psi]
= Ultimate tensile strength [MPa,psi]
= When SUS  SU

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