Rolling contact fatigue assessment of repair rail welds
Artikel i vetenskaplig tidskrift, 2019

A repair welding procedure is numerically simulated. To validate the numerical model, analyses of the temperature evolution in a repaired rail are compared to existing full-scale test results. Thermomechanical simulations are carried out to evaluate the residual stress formation during welding and how the residual stress field is influenced by subsequent wheel passages during operations. The risk of rolling contact fatigue (RCF) is analysed and results discussed. It is found that tensile stress magnitudes resulting from welding decrease substantially during rolling contact loading. The influence of the residual stresses on RCF is found to be minor 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 these factors on the risk of RCF is discussed.

Rolling contact fatigue

Stress redistribution

Rail repair welding

Thermomechanical analysis

FE simulations

Residual stresses

Författare

Elena Kabo

Chalmers, Mekanik och maritima vetenskaper, Dynamik

Anders Ekberg

Chalmers, Mekanik och maritima vetenskaper, Dynamik

Michele Maglio

Chalmers, Mekanik och maritima vetenskaper, Dynamik

Wear

0043-1648 (ISSN)

Vol. 436-437 203030

Styrkeområden

Transport

Ämneskategorier

Teknisk mekanik

DOI

10.1016/j.wear.2019.203030

Mer information

Senast uppdaterat

2019-11-10