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Fatigue has traditionally been associated with the failure of metal components which led to the term metal fatigue. In the nineteenth century, the sudden failing of metal railway axles was thought to be caused by the metal crystallising because of the brittle appearance of the fracture surface, but this has since been disproved. [ 1 ]
Goodman relation. 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]
The fatigue limit or endurance limit is the stress level below which an infinite number of loading cycles can be applied to a material without causing fatigue failure. [ 1] Some metals such as ferrous alloys and titanium alloys have a distinct limit, [ 2] whereas others such as aluminium and copper do not and will eventually fail even from ...
Haigh was educated at Allan Glen's School 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.
Work hardening, also known as strain hardening, is the process by which a material's load-bearing capacity (strength) increases during plastic (permanent) deformation. This characteristic is what sets ductile materials apart from brittle materials. [ 1] Work hardening may be desirable, undesirable, or inconsequential, depending on the application.
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Vibration fatigue is a mechanical engineering term describing material fatigue, caused by forced vibration of random nature. An excited structure responds according to its natural-dynamics modes, which results in a dynamic stress load in the material points. [1] The process of material fatigue is thus governed largely by the shape of the ...
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. The method successively extracts the smaller ...