Goodman Fatigue Calculator

Modified-Goodman fatigue check for combined mean and alternating stress.

Alternating stress σa (MPa)Mean stress σm (MPa)Endurance limit Se (MPa)Ultimate strength Su (MPa)Calculate

Equation

σa/Se + σm/Su = 1/FoS (Goodman line)

Assumptions

Constant-amplitude uniaxial loading. Apply your own stress-concentration and surface-finish corrections to Se beforehand.