Rolling contact fatigue assessment of repair rail welds
Paper in proceedings, 2018

A repair welding procedure is numerically simulated. To validate the numerical model, analyses of the temperature evolution are compared to full-scale test results. Further simulations are then carried out to evaluate the residual stress formation during welding and how the residual stress field is influenced by subsequent wheel passages. The influence of residual stresses from welding and the subsequent residual stress redistribution during operations on the risk of rolling contact fatigue (RCF) is discussed and analyzed. It is found that high tensile stresses are formed during welding, however these shake down substantially during subsequent operations. The influence on RCF is found to be moderate on the surface and somewhat more severe in a layer at the bottom of the repair weld. In addition to residual stresses, there is also a risk that welding introduces material defects and alters material properties. The influence of such phenomena on RCF are discussed.

stress redistribution

FE simulations

thermomechanical analysis.

rolling contact fatigue

rail repair welding

residual stresses

Author

Elena Kabo

Chalmers, Mechanics and Maritime Sciences, Dynamics

Chalmers Railway Mechanics (CHARMEC)

Anders Ekberg

Chalmers, Mechanics and Maritime Sciences, Dynamics

Chalmers Railway Mechanics (CHARMEC)

Michele Maglio

Chalmers, Mechanics and Maritime Sciences, Dynamics

Chalmers Railway Mechanics (CHARMEC)

Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems (CM2018)

2590-0609 (ISSN)

450-456

11th International Conference on Contact Mechanics and Wear of Rail/Wheel systems
Delft, Netherlands,

Areas of Advance

Transport

Subject Categories

Applied Mechanics

Manufacturing, Surface and Joining Technology

Other Materials Engineering

More information

Latest update

1/18/2019