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Erschienen in:
2001 | OriginalPaper | Buchkapitel
Fatigue and Creep Fatigue
verfasst von : Dominique P. Miannay
Erschienen in: Time-Dependent Fracture Mechanics
Verlag: Springer New York
Enthalten in: Professional Book Archive
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Fatigue consists of the cycling loading of a structure over time, that is loading and unloading. Thus, the new aspect introduced is the unloading, which suppresses proportional loading at the crack tip and leads to the accumulation of residual stresses after unloading.When creep phenomena are superimposed to fatigue phenomena at high temperatures, the creep singularity, which can be described by loading parameters C(t), C*, etc., is destroyed and residual stresses are built up during unloading. During subsequent loading, the creep process is resumed, but no satisfactory analytical solutions exist at present. Finite-element computation can be carried out to obtain the stress-and-strain fields around the crack tip, but these computations are time consuming and may be umeliable.