The current trend toward high-speed train demands extending the service life und increasing the reliability of wheelset. In order to solve this technical challenge, great efforts to improve the wheel und rail have been made. With regard to safety it is very important to evaluate the fracture mechanics of wheels und axles. In the present paper, the evaluation based on fracture mechanics such as dynamic fracture toughness und charpy impact energy was carried out for high-speed train wheelsets materials (tread, plate, bolt hole of the wheel and for the surface of a press fit axle for wheels on axles). The results obtained are as follow: 1) The fracture toughness and impact energy of the wheel material varies significantly depending on the position of the specimen from the wheel. The highest fracture toughness was measured at the tread region, and it decreased slightly toward the bolt hole location. Axle material is a relatively tough material at room temperature with stable crack extension 2. The results show that dynamic fracture toughness is obviously lower than static fracture toughness, and the fracture mechanics characteristics are different between locations at the wheel tread and at the bolt hole location. Dynamic fracture toughness is significantly lower than static and should therefore be considered in the design code of the wheelset. 3) The wheel material is brittle at normal service temperatures with a slight increase of toughness above 50 C degree. Axle material has higher notch toughness. Also, the FATT of the materials used should be below -20 C or -50 C degree. However, the FATT in wheelset materials is far above -20 C or -50 C degree.
Dynamic fracture toughness and charpy impact properties of wheel and axle materials for high speed train
2003
5 Seiten, 10 Bilder, 7 Quellen
Conference paper
English
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