Abstract
Crack propagation experiments were conducted on 6061-T6 Al alloy for high-low and low-high block loads at various combinations of overload ratios (0.0–0.1,0.0–0.2,0.0–0.3,0.0–0.5, 0.2-0.0 and 0.3-0.0). On the basis of these experiments one power law is developed for the high-low case to predict the delay period at a particular block load ratio. The delay period after application of the low amplitude block load is increased as the magnitude of the low block load is decreased. In the low-high sequence, an acceleration is observed in the crack growth rate. For the high-low load sequence, a retardation was observed in the crack growth rate.
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