Residual stress and its consequences on both sides of the wheel-rail interface
| Autor: | D.E. Gray, O. Orringer, P.K. Raj, W.R. Paxton |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Fatigue cracking
Materials science business.industry Fatigue testing Fracture mechanics Surfaces and Interfaces Structural engineering Dissipation Condensed Matter Physics Residual Surfaces Coatings and Films Stress (mechanics) Shear (geology) Mechanics of Materials Residual stress Materials Chemistry business |
| Zdroj: | Wear. 191:25-34 |
| ISSN: | 0043-1648 |
| DOI: | 10.1016/0043-1648(95)06674-8 |
| Popis: | The contact pressures from service loads gradually change the residual stresses in the heads of rails and the rims of wheels from their initial (as manufactured) distributions as permanent plastic deformation accumulates. The resultant state has a near-surface compressive component, aligned with the major live stress, which protects the contact surface against fatigue propagation of shallow surface cracks unit wear removes them. If the contact pressures are high enough, internal residual tension may develop and promote subsurface fatigue cracking. The fatigue environment can also be exacerbated by high traction/ braking shear loads or by local heating and thermal stress if the interface is subjected to high power dissipation. The Federal Railroad Administration sponsors research on problems involving rail and wheel cracks in order to foster safer railroad operations. The goal is to establish rational criteria for load or life limits. The research program development history and major findings are summarized. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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