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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. [1]
Haigh was educated at Allan Glen's School [6] and the University of Glasgow He served as professor of applied mechanics at the Royal Naval College in Greenwich. Haigh is known for his contributions in the fields of metal fatigue, welding and theory of plasticity. He is particularly known for Haigh diagram. [7] [8]
This definition introduces to the fact that material failure can be examined in different scales, from microscopic, to macroscopic. In structural problems, where the structural response may be beyond the initiation of nonlinear material behaviour, material failure is of profound importance for the determination of the integrity of the structure.
Created Date: 8/30/2012 4:52:52 PM
Rainflow counting identifies the closed cycles in a stress-strain curve. The rainflow-counting algorithm is used in calculating the fatigue life of a component in order to convert a loading sequence of varying stress into a set of constant amplitude stress reversals with equivalent fatigue damage.
Since "Goodman diagram" seems to be the most commonly-used term of that group, then in accordance with WP:COMMONNAME, I suggest moving this article from "Goodman relation" to "Goodman diagram". -- DavidCary ( talk ) 06:40, 26 January 2013 (UTC) [ reply ]
Lode coordinates (,,) or Haigh–Westergaard coordinates (,,). [ 1 ] are a set of tensor invariants that span the space of real , symmetric , second-order, 3-dimensional tensors and are isomorphic with respect to principal stress space .
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