Abstract
This study investigates the effect of the phase angle between fretting and fatigue loads on the life of Al7050-T7451 aluminum alloy specimens. Tests with phase angles of 0°, 45°, 90° and 135° are carried out using a bi-actuator system which permits the distinct control of fretting and fatigue loads. A numerical stress analysis for the in phase condition is developed and compared with the closed form solution to provide a benchmark for the study. Life is estimated using three different critical plane criteria coupled with extended versions of the Theory of Critical Distances. Results show that the introduction of a phase angle between loads plays a significant role on the fatigue life of this alloy.
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