钢轨打磨磨痕粗糙度与交叉磨痕对滚动接触疲劳损伤的影响

利用砂纸在钢轨试样表面打磨出不同粗糙度等级(1、4和7 μm)的单向磨痕和交叉磨痕(−45°/70°、−20°/90°和45°/70°)，利用MMS-2A轮轨摩擦磨损试验机对打磨后的钢轨试样进行滚动试验并分析滚动接触疲劳损伤规律. 结果表明：打磨钢轨的滚动磨损表面粗糙度和损伤均比未打磨钢轨严重，随打磨磨痕粗糙度增加，钢轨滚动磨损表面粗糙度和损伤均呈减小趋势. 当打磨粗糙度为7 μm时，滚动接触疲劳裂纹为枝裂纹，裂纹深度较小；随打磨粗糙度减小，枝裂纹发生贯穿连通形成网状裂纹损伤，裂纹深度增加. 相较于单向打磨钢轨，交叉打磨磨痕钢轨滚动磨损表面粗糙度较低，滚动接触疲劳损伤较轻微. 此外，−45°/70°和45°/70°交叉磨痕的滚动损伤比−20°/90°交叉磨痕钢轨更加轻微.

Unidirectional wear scars and cross wear scars with different roughness grades (1, 4 and 7 μm) (−45°/70°, −20°/90° and 45°/70°) were fabricated on the surface of rail specimens using abrasive paper. Rolling tests were conducted on the ground rail specimens with an MMS-2A wheel-rail friction and wear tester, and the rolling contact fatigue damage behavior was analyzed. The results indicate that both the rolling wear surface roughness and damage of ground rails are more severe than those of unground rails. As the roughness of the ground wear scars increases, the rolling wear surface roughness and damage of the rails exhibit a decreasing trend. When the grinding roughness is 7 μm, the rolling contact fatigue cracks are branch cracks with small depths. As the grinding roughness decreases, the branch cracks penetrate and connect to form network-like crack damage, and the crack depth increases. Compared with unidirectionally ground rails, rails with cross-ground wear scars have lower rolling wear surface roughness and milder rolling contact fatigue damage. In addition, the rolling damage of rails with −45°/70° and 45°/70° cross wear scars is milder than that of rails with −20°/90° cross wear scars.

搜集汇总

背景与挑战

背景概述

该数据集研究了钢轨打磨磨痕粗糙度（1、4和7 μm）和交叉磨痕（如-45°/70°、-20°/90°和45°/70°）对滚动接触疲劳损伤的影响。实验发现，打磨钢轨的损伤比未打磨钢轨严重，但随粗糙度增加损伤减小；交叉打磨磨痕（特别是-45°/70°和45°/70°）能降低表面粗糙度并减轻疲劳损伤，为钢轨维护提供优化依据。