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Method of Virtual Mean Stress Fatigue Curve Equation

Strength and Mechanics of Materials

Method of Virtual Mean Stress 

= Amplitude of normal (shear) stress [MPa,psi]
= Endurance limit at constant strength [MPa,psi]
= Mean cycle stress [MPa,psi]]
= Virtual mean stress [MPa,psi]
= Haigh factor diagram narrowing
= Coefficient; For Bending 

For shear

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