Soderberg Fatigue Calculator

Soderberg fatigue check — a conservative alternative to Goodman, using yield strength instead of ultimate.

Alternating stress σa (MPa)Mean stress σm (MPa)Endurance limit Se (MPa)Yield strength Sy (MPa)Calculate

Equation

σa/Se + σm/Sy = 1/FoS (Soderberg line)

Assumptions

Constant-amplitude uniaxial loading. More conservative than Goodman since it limits mean stress at yield rather than ultimate.