In the field of railway technology, there is a problem known as rolling contact fatigue (RCF) in rails. It is necessary to elucidate the mechanism of the initiation and the growth of the RCF cracks in order to prevent unexpected accidents caused by this phenomenon. Hirakawa reported that residual stress plays an important role in the behavior of cracks in the rail. However, residual stress in rails is one of the most unknown parameters in the RCF phenomenon. In this study, the authors used X-ray stress measurement to clarify the residual stress state caused by rolling contact fatigue (RCF) in the surface of the rail head. To accommodate future field measurements, the authors used an area detector type X-ray stress measurement. A method for determining the depth profile of stresses was also conducted. Furthermore, the measurements were made with synchrotron radiation in order to estimate residual stresses in the near surface under the optimum conditions.
Residual stress measurements by synchrotron radiation for rail surfaces damaged by rolling contact fatigue
Eigenspannungsmessungen mit Synchrotronstrahlung für Schienenoberflächenschäden durch Wälzermüdung
2008
7 Seiten, 7 Bilder, 1 Tabelle, 15 Quellen
Conference paper
Storage medium
English
Non-destructive residual stress measurement in rail heads and rolling contact fatigue
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