Abstract
The fatigue tolerance of 5083 aluminum (Al) alloy has attracted considerable research interest owing to its wide application in railway vehicle and shipbuilding industries. Thus, the fatigue crack propagation (FCP) behavior of this alloy is studied under various stress ratio (R) conditions. The results show that the higher R, the higher is FCP rate and the lower are threshold and fracture toughness. Microstructure examination of the crack path shows that the crack tends to propagate toward grains with lower twist angle and higher Schmid factor with an increase in R. The effect of R on FCP behavior was discussed from the microstructure perspective through a modified crystallographic model that considers the twist angle and the Schmid factor.
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