Rolling Friction and Wear, and Damage Behavior of Wheel/Rail at High Rotation Speed and Different Normal Loads
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摘要: 利用滚动接触疲劳试验机研究了高转速不同法向载荷（2 000, 5 000, 8 000 N）条件下, 车轮与钢轨(以下简称轮、轨)试样间的滚动摩擦磨损和损伤行为。结果表明:随着法向载荷增大, 轮、轨试样间滚动摩擦稳定阶段的摩擦因数以及轮、轨试样的磨损量、塑性变形层厚度均逐渐增大; 在相同的试验条件下, 轮试样的磨损量大于轨试样的磨损量; 轮、轨试样的表面损伤皆表现为典型的滚动接触疲劳特征, 并且轮试样的疲劳损伤更严重, 表面更易萌生裂纹。Abstract: The rolling friction and wear, and damage behavior of wheel/rail specimens at high rotation speed and different normal loads （2 000, 5 000, 8 000 N） were investigated by a rolling contact fatigue testing machine. The results show that the friction coefficient during stable rolling contact stage and the wear as well as the thickness of plastic deformation layer of wheel/rail specimens all raised with the increase of normal load. Under the same friction conditions, it was shown that wear of wheel specimen was a little bit larger than that of rail specimen. The surface morphology of wheel/rail speciens presented the typical appearance of rolling contact fatigue. What′s more, the fatigue damage of wheel specimen was more seriously and the initiation of cracks could be observed more frequently in wheel specimen.
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Keywords:
- normal load /
- wheel /
- rail /
- rolling contact /
- friction and wear /
- fatigue damage
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