Abstract
Fatigue crack propagation rates were measured under two-step programmed loading for a centre-cracked specimen of 9Cr-2Mo steel in which a high tensile residual stress field had been previously induced. This tensile residual stress makes the actual stress ratio at the crack tip high enough to avoid crack closure. Therefore the applied range of stress intensity factor ΔK coincided with the effective range ΔK eff, and as a result no transitional behaviour in the rate of fatigue crack propagation occurred after a sudden change in ΔK.
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