Abstract
Fatigue tests were carried out using extruded Mg alloy AZ61 to study the distribution of fatigue lives under constant stress amplitudes. Cracks initiated from the inclusions existing on the specimen surface during the fatigue process of the alloy, and then propagated prior to final failure of the specimen. The probabilistic distributions of both the inclusion's densities, and their sizes (areas) were investigated experimentally in detail. The distributions of the fatigue lives of the extruded Mg alloys under the constant stress amplitudes were evaluated using the Monte-Carlo simulation, in which the Weibull random numbers coffesponding to the above probabilistic distributions of the inclusions are utilized. A good agreement between the evaluated distribution of the fatigue lives and the experimental one was obtained.
