Effect of contact pressure on torsional fretting fatigue damage evolution of a 7075 aluminum alloy

Document Type

Article

Publication Date

9-1-2019

Abstract

Contact pressure is a crucial factor which can affect fretting fatigue (FF) life significantly. In this research, the influence of contact pressure on torsional fretting fatigue (TFF) damage of a 7075 aluminum alloy is investigated. According to the experiment results, below 72.5 N?m torque as the contact pressure increases, the TFF life decreases firstly and then it reaches to the lowest point at 300 N, while afterward the TFF life increases. The P-N curve shows a C shape. The damage analysis results show that with increasing the contact pressure, the damage becomes severer. The oxidative products are mainly Al2O3 and Al(OH)3, and the loading side is found to be more oxidized than the center position and fixed side.

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