Various stresses add to the railway rails and accumulate fatigue damage due to daily use. Fracture mechanics clarification concerning the growth behavior of cracks is needed, in order to decide the inspection period and the cycle. Though the crack progression and influence of residual stress on fatigue strength has been researched for many years, they are not clear now. The aims of this research are the assistance of the inspection period and the cycle decision of the rail maintenance. This research suggests of combining the strain gauge method with the FEM analysis. To sum up this research, the main conclusions are as follows: It was similar to the result of Luzin; the residual stress value of each stress component is low. For un-used rail, the influence can be supposed to be very small though the residual stress is formed by the universal rolling and the heat treatment, etc. There are good prospects of evaluating the state of the rail residual stress before the rail is destroyed by using both the strain gauge and the FEM analysis. It will be necessary to examine the state of the internal residual stress of the test specimen with a high residual stress distribution in the future. The FEM analysis result indicated an excellent agreement in the rail head with that of X-ray measurement. It is thought that the residual stress distribution of the material surface can be presumed by FEM analysis. The neutron diffraction method can evaluate internal residual stress distribution. The validity of the internal residual stress distribution by the FEM analysis can be evaluated effectively with the neutron diffraction method. This is what we will focus on in future research.
Residual stress evaluation of railway rails
Bewertung der Eigenspannung in Eisenbahnschienen
2008
8 Seiten, 13 Bilder, 1 Tabelle, 7 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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