Abstract
The effect of a single peak overload cycle on the rate and mechanism of fatigue crack propagation under constant amplitude loading was investigated in controlled-rolled C-Mn and C-Mn-Nb-V structural steels. The imposition of an overload cycle caused a retardation of crack growth which was of greater duration when the stress intensity range and/or stress ratio of constant amplitude loading was low. Fractographic observations and measurements of crack tip displacement revealed that crack tip blunting was produced by the overload. Stress relieving treatments and overload/underload tests indicate that the main cause of crack retardation was the influence of residual compressive stresses within the overload plastic zone, rather than the effect of crack tip blunting.
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