Fatigue is blamed for seventy-five percent of metal failures, and fatigue's cost to the infrastructure, aircraft, military equipment, motor vehicles, structures, and machinery is huge. Unidentified as a different phenomenon than overstress and other metal failure modes only about 200 years ago the scientific studies to understand its relationship with yield strength, ultimate strength and plastic deformation have been extensive. Astute researchers have identified many characteristics of different metals to be able to estimate the expected life of particular metals and their alloys with some precision. Metal manufacturers have been successful in improving alloy compositions and manufacture to extend fatigue life with remarkable success. Users like the author have puzzled over the many apparent causes of fatigue and in desperation accepted the failures as normal. Some surface deformation processes have helped extend fatigue life in some metals and some configurations. Also, an analysis of fatigue damage as a physical-chemical phenomena is proposed with an easy surface treatment of etching followed by a corrosion preventive treatment that in one series of tests extend fatigue life as much as 200 times. The process can be done during manufacture or with some configurations after begin of service, even after some fatigue damage has occurred.
Process to increase fatigue life of metals
MS&T, Materials Science and Technology, 2008 ; 2516-2521
2008
6 Seiten
Aufsatz (Konferenz)
Englisch
Anwendung in der Luft- und Raumfahrt , Anwendung in der Wehrtechnik , Bruchgrenze , chemische Oberflächenbehandlung , Ermüdungslebensdauer , Fehleranalyse , Flugzeugbau , Korrosionsermüdung , Korrosionsschutzschicht , Kraftfahrzeug , Legierung , Militärfahrzeug , Oberflächenverformung , plastische Verformung , Schadensanalyse , Streckgrenze , technisches Metall , Überlastung , wissenschaftliche Untersuchung , Zugfestigkeit
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