Abstract
In this study, fatigue tests were carried out using a diecast Mg alloy AZ91 and an extruded Mg alloy AZ61 to study the distribution of fatigue lives under constant stress amplitudes. During the fatigue process of the diecast Mg alloy, cracks initiated from the casting defect existing inside of the specimen. In the case of extruded Mg alloy, cracks were initiated from the inclusions existing on the specimen surface. The extreme-value distribution of the defect sizes, and of the spatial positions of the defects were investigated experimentally in detail. The distributions of the fatigue lives of two kinds of Mg alloys under the constant stress amplitudes were evaluated using the Monte-Carlo simulation. An increase of scatter in the distribution of the fatigue life with lowering of the stress amplitude could also be predicted using the simulation.
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