Bagci Method Fatigue Curve Equation Summary
Strength and Mechanics of Materials
The Bagci (ASME, Bagci and Gerber) use the intersection with the mean stress axis for calculations, but they lie higher in the area of modest mean stresses than most linear methods. The general response is therefore nonconservative. However, the trend toward high mean stresses again cannot be correct, because the material response quite frequently exceeds Re in the mean stresses.
Bagci Method Formula
| Where: | |
 |
= Amplitude of normal (shear) stress [MPa,psi] |
 |
= Endurance limit at constant strength [MPa,psi] |
 |
= Mean cycle stress [MPa,psi]] |
 |
= Yield tensile strength [MPa,psi] |
 |
= Yield tensile strength [MPa,psi] |
 |
= Yield shear strength [MPa,psi] when SYS  .577 SY |
Stress Amplitude vs Mean Stress Graph
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