Prediction of Fatigue Strength of Aluminum Casting Alloys by the .RAD.area Parameter Model.

Abstract

In order to evaluate quantitatively the effect of inherent defects on the fatigue strength of aluminum casting alloys, a fatigue strength prediction by the √(area) parameter model was performed using the statistics of extreme values of defect size. Rotating-bending fatigue tests were carried out on AC4C aluminum alloys with three levels of defect size. It was found tha the fatigue strength decreased with increasing defect size and the prediction for the lower limits of fatigue strength of these aluminum alloys was successfully correlated with the results of experiment.