Assessment of uncertainties in life prediction of fatigue crack initiation in rails – influence of residual stresses from manufacturing
Paper in proceedings, 2007

The risk for initiation of fatigue cracks in the web in the weld zone of a rail is studied. The interaction between the welding residual stress field and the stress field caused by service loads is simulated in a nonlinear finite element (FE) analysis where the welding residual stress distribution (shape) and magnitude, the service load magnitude, and the material parameters used in the fatigue life estimation are varied. The initiation of fatigue cracks is assessed using the shear-stress-based multiaxial fatigue criterion proposed by Dang Van. In addition, the accuracy in the fatigue life assessment is evaluated by statistical uncertainty analysis where the variances according to the Gauss approximation formula are studied. It is seen that the welding residual stress enhances the risk for fatigue crack initiation in the rail web, and that the uncertainty in load level dominates the uncertainty in the fatigue assessment.

Fatigue

uncertainty prediction

residual stress

railway rails

Author

Lennart Josefson

Chalmers, Applied Mechanics

Jonas Ringsberg

Ship Design

Proceedings of The 8th International Conference on Multiaxial Fatigue & Fracture (ICMF&M8)

1-8 Published on CD-ROM

The 8th International Conference on Multiaxial Fatigue & Fracture (ICMF&M8)
Sheffield, United Kingdom,

Driving Forces

Sustainable development

Areas of Advance

Transport

Materials Science

Subject Categories

Manufacturing, Surface and Joining Technology

Reliability and Maintenance

Other Materials Engineering

Vehicle Engineering

Roots

Basic sciences

More information

Latest update

10/9/2018