Mechanisms of mixed mode fatigue crack propagation at rail butt-welds
| Autor: | Stefano Beretta, H. Desimone |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Engineering
business.industry Mechanical Engineering Butt welding Torsion (mechanics) Fracture mechanics Structural engineering Paris' law Industrial and Manufacturing Engineering Crack closure Mechanics of Materials Modeling and Simulation Butt joint General Materials Science business Stress intensity factor Stress concentration |
| Zdroj: | International Journal of Fatigue. 28:635-642 |
| ISSN: | 0142-1123 |
| Popis: | In the present paper, the fatigue crack propagation of longitudinal flaws starting in butt-welded joints of rails is analysed. Firstly Finite Element simulations are carried out, in order to determine the actual stress intensity factor histories caused by the passage of the wheel over the rail. Simulations show that fatigue crack growth is dominated by an out-of-phase Mode I–Mode II mechanism with an overlapping of about 180 degrees. Then, mixed-mode fatigue test experiments have been designed in order to reproduce in-service conditions at laboratory test level. For this purpose, tubular specimens have been subjected to mixed-mode loading (reversal torsion combined with axial tension/compression). The crack growth propagation dominated by the shear has been confirmed. At the end of the paper, the conditions to obtain the shear mode crack propagation are discussed and the kinetics data are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect