Abstract
This paper describes a technique that enables fatigue crack growth rate to be determined for a range of stress ratios, R, using a single specimen. The procedure eliminates some of the scatter normally encountered when data are obtained from multiple specimens. In the process of verifying the procedure, the effect of R on the fatigue crack growth rate in steel Q1N, and the effect of increases and decreases in R, have been examined. Change in the stress ratio causes significant change in the crack growth rate in the Paris regime, but transient effects are not observed unless the maximum stress intensity factor at the crack tip is reduced by more than about 10%.
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