Fatigue life prediction of Al 7075-T6 notched specimens with circular holes using several multiaxial fatigue criteria

Abstract

In this study, Fatigue lives of the specimens with circular holes have been studied on the fatigue life strength of 7075-T6 aluminum alloy specimens via experimental and multiaxial fatigue analysis. The tests of Load controlled fatigue stated samples have been conducted on the servo-hydraulic Zwick/Amsler fatigue testing machine with the frequency of 15 Hz. ANYS code which defines a finite nonlinear element was chosen as the measure of stress and strain of the specimens which are caused by the loads applied on these specimens. Fatigue lives of the specimens with circular holes were predicted with Kandil-Brown-Miller (KBM), Glinka, Varvani-Farahani (VF), Fatemi-Socie (FS), and smith-Watson- Topper (SWT) multiaxial fatigue criteria by means of the local stress and strain distribution obtained from the finite element analysis. The comparison between experimental results and multiaxial fatigue predictions revealed that among the applied criteria, the Glinka and FS approaches have the best accuracy for the specimens.