4009 Low Cycle Fatigue Life of 1070 Aluminum Under Stress Controlled Multiaxial Loading

Abstract

This paper describes the low cycle fatigue life of 1070 aluminum under stress controlled multiaxial loading. Proportional loading tests were carried out under combined push-pull and reversed torsion. Non-proportional loading tests were also carried out using three stress paths of cruciform, box, and circle. Mises stress range, Mises strain range and maximum principal stress range were applied to the experimental data and the applicability of the life prediction methods was discussed. No life prediction methods accurately predicted the multiaxial low cycle fatigue life under non-proportional loading within a small scatter band.