Before revision: In materials science and fatigue, the Goodman relation is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material materialTapany Udomphol.
After revision: The Goodman relation also called a Goodman diagram, a Goodman-Haigh diagram, a Haigh diagramor a Haigh-Soderberg diagram, is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a materialTapany Udomphol.