Abstract

The correlation between the mechanical properties of a material in microvolumes and the material under a load has been studied. A fractographic analysis is performed for the surface of fatigue failure of a railway rail with an internal cross crack. The correlation of the fractographic features with the material structure is discussed. A sample with an internal cross crack in the rail head had been withdrawn from service after severe cyclic loading in a turnout switch. For the metallographic study, the sample was subjected to a three-point bending. Three regions with different characters of the material fracture have been revealed at the surface of the fracture.

中文翻译：

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钢轨疲劳破坏分析

摘要

研究了微体积材料的机械性能与负载下的材料之间的相关性。对具有内部十字形裂纹的铁轨的疲劳破坏表面进行分形分析。讨论了形貌特征与材料结构的相关性。在道岔开关中承受严重的周期性载荷后，已将轨道头内部有交叉裂纹的样品退出使用。为了进行金相研究，将样品进行三点弯曲。在断口表面发现了三个具有不同断口特征的区域。