Abstract
The fretting fatigue characteristics of 8090-T7 and 7075-T651 aluminum alloys were investigated. The purpose of this investigation was to determine the relative effects of wear and environmental degradation from laboratory air on the fretting fatigue process. The fretting fatigue test system used in this experimentation enables testing either in air or a scanning electron microscope vacuum environment. Fretting fatigue damage in vacuum tests was considered as resulting predominantly from wear, whereas damage from tests in air results from the concurrent wear and oxidation mechanisms. Based on this experimentation, it was concluded that: • Degradation of fatigue life in air due to fretting is caused primarily by wear mechanisms for 8090-T7 aluminum. • Fretting fatigue life in air was greater than fretting fatigue life in a vacuum for the 8090-T7 aluminum under the conditions of this experimentation. • Environmental mechanisms significantly decrease fatigue life due to fretting in air for 7075-T651 aluminum. • Fretting fatigue behavior is material dependent.
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