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Investigation of residual stresses in a repair-welded rail head considering solid-state phase transformation.
- Source :
-
Fatigue & Fracture of Engineering Materials & Structures . Jul2017, Vol. 40 Issue 7, p1059-1071. 13p. - Publication Year :
- 2017
-
Abstract
- Repair welding for recovery from local damage of a rail head surface is known to cause high residual stress and can accelerate fatigue in the rail. This study examines repair-welded rails by applying experimental and numerical approaches. In the former approach, two newly manufactured rail specimens and four repair-welded rail specimens with two different weld depths were prepared, and their residual stresses were measured with a sectioning method. In the latter approach, a finite element repair welding simulation model was developed that adopted a prescribed temperature method with a moving block as an input heat source, and the thermal strain caused by the volume change due to solid-state phase transformation was considered. Overall, the residual stresses correlated well between the experimental and numerical approaches. The measured high compressive residual stress of −290 MPa seems to be beneficial to prevent a crack initiation in the rail surface. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 8756758X
- Volume :
- 40
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Fatigue & Fracture of Engineering Materials & Structures
- Publication Type :
- Academic Journal
- Accession number :
- 123394618
- Full Text :
- https://doi.org/10.1111/ffe.12564