通过对广深铁路钢轨疲劳斜裂纹与钢轨侧磨的现场调查及钢轨滚动疲劳模拟试验,研究了钢轨滚动接触疲劳损伤与磨损之间的作用关系,分析了轮、轨滚动疲劳过程中钢轨磨损率对疲劳裂纹形成及裂纹扩展寿命的影响.结果表明:钢轨磨损严重时,疲劳斜裂纹损伤就表现轻微,钢轨滚动疲劳损伤与磨损之间表现为相互竞争与制约的耦合作用关系;通过增加磨损率能减轻钢轨的滚动疲劳损伤,有利于延长钢轨的疲劳裂纹扩展寿命.
The relationship between rolling contact fatigue damage and wear of rail had been explored by the investigation on rail fatigue oblique crack and side wear volume on Guangzhou-Shenzhen high-speed railway and rolling simulation test of rail. The effects of wear rate of rail on formation of fatigue crack and crack propagation life had been analyzed in the rolling wear of wheel-rail process. The results indicate that when rail wear was severe, rail fatigue oblique crack was relatively slight. The relationship between rolling contact fatigue crack damage and rail wear was manifested as mutual competitive and restrictive coupling mechanisms. In the practical application, increasing wear rate of rail could alleviate rolling contact fatigue of rail and prolong the fatigue life.
参考文献
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