Mixed mode fatigue and fracture behaviour investigation on rail and welded rails

Date

2026-2-26

Author

Agin, Onur

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Derailment is one of the most controversial topics in the world. There are lots of accidents due to the derailment of the wagons from the rails. Fatigue and fracture of the rails are common causes of derailment and accidents. In the thesis, mixed mode (I+II) Fatigue Crack Growth rate of the R 350 HT grade rail in base and flash-Butt welded region were investigated in different angles (15°, 30°, 45°, 60° and 75°). According to the results, it is found that the Crack Growth rate of the specimens in the parent metal decreases with increasing the angle. This behavior is also observed in the welded specimens, where crack growth is induced in the weld region. However, when comparing the welded and parent metal, it is seen that the crack growth rate of the welded specimens is lower than the parent metal. It was also found that this mainly results from the material’s microstructure.

Subject Keywords

Fatigue, Fracture, Rail, Crack, Welding

URI

https://hdl.handle.net/11511/119020

Collections

Graduate School of Natural and Applied Sciences, Thesis