Abstract
The cyclic stress intensity threshold (Δ K TH ) below which cracks will not propagate varies with length for short cracks. A model is proposed which relates Δ K TH to the crack closure stress arising from fracture surface roughness. This is used to predict a variation in Δ K TH with crack length for surface cracks in Ti 6Al-2Sn-4Zn-6Mo alloy, based upon measured values of crack opening displacement arising from roughness. The predicted variation in Δ K TH with crack length is found to be similar to that obtained from the empirical model of Δ K TH proposed by El Haddad et al.[5]. The application of the new model to estimate the value of crack closure stress arising from crack tip plasticity for short surface cracks is also discussed.
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