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- Title
Investigation of residual stresses in a repair-welded rail head considering solid-state phase transformation.
- Authors
Jun, H‐K; Kim, D‐W; Jeon, I‐S; Lee, S‐H; Chang, Y‐S
- 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.
- Subjects
RESIDUAL stresses; STRENGTH of materials; AXIAL stresses; BEARING capacity (Bridges); BENDING moment
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2017, Vol 40, Issue 7, p1059
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12564