FöRFATTARE
Ringsberg, J W; Lindbäck, T; Olsson, M; Josefson, B L; Näsström, M O

DATUM
2000-12-21

INSTITUTION
Maskinteknik / Datorstödd maskinkonstruktion

SAMMANFATTNING
In this report an investigation of contact fatigue in railway track is presented. Especially rolling contact fatigue under enviromental extremes such as heavy load will be studied.

The focus is on the modelling of the processes that lead to contact fatigue. In order to model this process the residual stress state after manufacturing will be taken into account.

In this study Luleå university of technology has modelled the manufacturing process which includes calculating residual stresses after manufacturing. Chalmers University of Technology has analysed the fatigue life of the rail due to rolling contact fatigue.

Three different load cases have been considered; one with stress free initial conditions, one with measured residual stress values and one with residual stress values calculated from the modelling of the manufacturing process. The simulation shows that crack initiation will appear after 1-2 days of heavy haul traffic, which agree with informations from Banverket that states that cracks have been observed after less than one week.

ISSN 1402-1528 / ISRN LTU-FR--00/12--SE / NR 2000:12