1. Investigation of residual stresses in a repair-welded rail head considering solid-state phase transformation.
- Author
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Jun, H‐K, Kim, D‐W, Jeon, I‐S, Lee, S‐H, and Chang, Y‐S
- Subjects
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RESIDUAL stresses , *STRENGTH of materials , *AXIAL stresses , *BEARING capacity (Bridges) , *BENDING moment - 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]
- Published
- 2017
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