S-N Curve Life Estimator

Estimate fatigue life from S-N curve parameters using modified Goodman or Soderberg criteria for fully-reversed and mean stress loading.

Alternating (half-range) stress amplitude.
MPa
Mean stress. 0 for fully reversed loading.
MPa
Corrected endurance limit of the material.
MPa
Ultimate tensile strength.
MPa
Fatigue strength exponent. Typically -0.05 to -0.12.

Results

Equiv. Fully-Reversed Sa-MPa
Safety Factor (Goodman)-
Estimated Life Nf-cycles
References: Shigley's Ch. 6 — Fatigue; ASTM E739