Abstract
Fretting fatigue tests were carried out using a 2618 aluminum alloy to investigate the effect of contact pressure and relative slip range between the specimen and the contact pad on fretting fatigue strength. Irrespective of contact pressure and relative slip range, the fretting fatigue strength was reduced to one quarter of the plain fatigue strength under the stress ratio R=0.0. However, a slight reduction in fretting fatigue strength occured with a decrease in contact pressure and with an increase in relative slip range, respectively. Friction force came to a constant value beyond a certain relative slip range (9 μm) under a pad-span of 30 mm and a contact pressure of 20 MPa. MoS2+PTFE coating improved fretting fatigue strength. And using fracture mechanics models, a prediction method for fretting fatigue endurance was assessed. The predicted fretting fatigue endurances were in good agreement with the experimental results of fretting fatigue tests.
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