Goodman Diagram

A graphical mean‑stress versus alternating‑stress fatigue criterion that presents allowable combinations of mean (Sm) and alternating (Sa) uniaxial stresses for high‑cycle fatigue, usually plotted with a linear Goodman line or relation of the form Sa/Se + Sm/Sut ≤ 1 (or variant forms using yield strength), where Se is the endurance limit and Sut the ultimate tensile strength; used to assess whethe