Before revision: The Goodman relation also called a Goodman diagram, a Goodman-Haigh diagram, a Haigh diagram or a Haigh-Soderberg diagram , is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material.Tapany Udomphol.
After revision: Within the branch of materials science known as material failure theory, the Goodman relation ( also called a Goodman diagram) a Goodman-Haigh diagram, a Haigh diagram or a Haigh-Soderberg diagram , is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material.Tapany Udomphol.