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Fatigue crack growth discrepancies with stress ratio |
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| Authors: | R. Jones B. Farahmand |
| Affiliation: | a Department of Mechanical and Aerospace Engineering, Monash University, P.O. Box 31, Victoria 3800, Australia b TASS Inc., 115th Ave NEKirkland, WA 98034, USA c Laboratory of Technology and Strength of Materials, Department of Mechanical Engineering and Aeronautics, University of Patras, Panepistimioupolis-Rion, 26500, Patras, Greece d Materials and Engineering Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK |
| Abstract: | This paper examines cracking in D6ac and 4340 steel along with Mil Annealed and STOA Ti-6Al-4V and finds that the data implies that in the Paris Region (Region II) of the crack growth curve there is only a minimal R ratio dependency. Presented is a theoretical basis for explaining this behaviour and suggest alternative ways for characterising crack growth prediction through the use of the Generalised Frost-Dugdale crack growth law. The Fatigue Damage Map method is then used to explain the physics behind this behaviour. |
| Keywords: | Ti-6Al-4V Crack growth R ratio Frost-Dugdale Crack closure |
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