Modified Godman Method Fatigue Curve Equation

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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