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Título
Effect of sudden load decrease on the fatigue crack growth in cold drawn prestressing steel
Autor(es)
Materia
Overload retardation effect
Loading sequences
Fatigue crack growth
Cold drawn prestressing steel
Crack tip opening displacement
Clasificación UNESCO
33 Ciencias tecnológicas
Fecha de publicación
2017-02-08
Resumen
This paper analyzes the overload retardation effect (ORE) on the fatigue crack growth (FCG) of cold drawn prestressing steel when different loading sequences are used. The ORE is more intense for elevated load decrease or for low initial stress intensity factor (SIF) range ΔK0. A transient stage can be observed in the Paris curve (da/dN–ΔK) when the KmaxΔK value suddenly decreases, associated with the ORE and with the evolution of the plastic zone and compressive residual stresses near the crack tip. In tests with Kmax decrease, a small zone appears related to FCG initiation, with a fatigue fractography resembling the tearing topography surface (TTS) mode, and associated with a decrease of crack tip opening displacement (CTOD).
URI
DOI
10.1016/j.ijfatigue.2015.01.007
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