| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 617208 | Wear | 2015 | 8 Pages |
•The fretting fatigue strength drops rapidly with the increase of contact pressure.•All the cracks initiate from the fretting area of fretting fatigue specimen.•The depth of crack initiation area increases with the increase of contact pressure.•Fatigue strength decreases with the increase of the depth of crack initiation area.•The main damage patterns are fatigue flake and plow.
With a new test facility, we have investigated fretting fatigue properties of Ti-1023 titanium alloy at different contact pressure. Both fatigue fracture and fretting scar were analyzed by scanning electron microscopy (SEM). Moreover, the depth of crack initiation area in fatigue fracture has been analyzed quantitatively, to investigate the relationship between the depth of crack initiation area and the fretting fatigue strength. The changing trends of the depth of crack initiation area and fretting fatigue strength with the increase of contact pressure show obvious opposite correlations. The depth of crack initiation area increases rapidly with the increase of contact pressure at low contact pressure (smaller than 10 MPa), and the fretting fatigue strength drops rapidly. At the contact pressure of 10–45 MPa, both the depth of crack initiation area and the fretting fatigue strength do not vary significantly. Contact pressure influences fatigue strength through influencing the initiation of fatigue crack. The main damage patterns are fatigue flake and plow.
