Knott, John

Shademan, S

Soboyejo, ABO

Soboyejo, WO

A physically-based model is presented for the prediction of fatigue crack growth in Ti-6Al-4V. The model assumes that the crack extension per cycle is directly proportional to the change in the crack-tip opening displacement, during cyclic loading between the maximum and minimum stress intensity factor. The extent of irreversibility is also assumed to exhibit a power law dependence on the effective stress intensity factor range. A simple power law equation is then derived for the prediction of fatigue crack growth as a function of the effective stress intensity factor range. The model is validated for fatigue crack growth in the near-threshold, Paris and high-AK regimes. The fatigue crack growth mechanisms associated with the parametric combinations of stress intensity factor ranges and maximum stress intensity factor are then summarized on fatigue mechanism maps. Mechanistically-based fatigue crack growth relationships are thus obtained for the prediction of fatigue crack growth in the near-threshold, Paris and high-AK regimes. (C) 2001 Elsevier Science B.V. All rights reserved

A physically-based model for the prediction of long fatigue crack growth in Ti-6Al-4V

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