Abstract
The results of crack tip cyclic plastic strain distributions given in Part I are employed to model the crack propagation that occurs as a consequence of fatigue damage. The Miner rule together with the low cycle fatigue endurance results are used to calculate the fatigue crack growth rate curves. In the two investigated alloys, Inconel 718 and Waspaloy, good agreement between the calculated and experimental fatigue crack growth rates was observed in the near-threshold regime. In contrast, at large ΔK values the calculated crack propagation rates were lower than the experimental ones. In the discussion the importance of a number of microstructural features related to the near-threshold regime is emphasized. Moreover, it is proposed to divide the crack propagation regime corresponding to higher crack growth rates into two zones. In one of these zones, crack propagation results essentially from striation formation while, in the second zone, two processes are operating, i.e. fatigue damage and striation formation.
Published Version
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