桨-毂轴承材料扭动微动磨损行为研究

采用面接触扭动微动形式，以动力定位系统可调距螺旋桨桨-毂轴承摩擦副材料(CuNiAl-42CrMo4)为对象，以不同的角位移幅值模拟海水波动影响下的微动磨损行为，并结合扫描电子显微镜和超景深三维显微镜对磨痕形貌进行分析，探究桨-毂轴承摩擦副材料扭动微动磨损规律。结果表明，随着角位移幅值的增加，扭动微动依次运行于部分滑移区、混合区、滑移区，摩擦因数减小，同时磨损量增加，微动损伤中剥层机制所占的比例逐渐增加，且由于疲劳裂纹扩展的不利影响，实际运行过程中要尽量避开混合区。

Research on Torsional Fretting Wear Behaviors of Material in Hub Bearings

The torsional fretting wear behavior researches of CuNiAl against 42CrMo4 in a controllable pitch propeller of dynamic positioning system were carried out on flat-on-flat contact under various angular displacement amplitudes simulating sea waves. The fretting wear appearances were discussed combined with the micro-examinations of the wear scar with scanning electron microscope and ultra-depth three-dimensional microscope， and the rule of torsional fretting wear behavior researches of CuNiAl against 42CrMo4 was investigated. The results indicate that with the increase of the angular displacement amplitudes the fretting running regimes change from partial slip regime to gross slip regime, corresponding to the decrease of the friction coefficients. And the damages of the torsional fretting become more and more severe while delamination tend to be the major wear mechanism at the same time. The mixed fretting regime should be avoided on account of the crack propagation which goes against the life time of the hub bearings.