| Strength
and Mechanics of Materials Quadratic ( Elliptic ) 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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