Abstract
Fatigue crack growth from a hole with a pre-existing compressive residual stress is simulated using two-dimensional elastic–plastic finite element analyses. The analyses allow a determination of the crack opening stress as the crack propagates through the residual stress, from which the effective stress intensity factor range Δ K eff and the fatigue crack growth is predicted. Results from these simulations are compared with experimental data and to predictions made using a conventional superposition of the elastic stress intensity factor. The crack closure-based methodology resulted in predictions which compared well with the experimental data, while the results using superposition were nonconservative. Predictions from the closure-based method are highly dependent on the d a/d N = f(Δ K eff) constitutive relationship used, highlighting the need for experimental methods to reliably measure this correlation.
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