Abstract
Fatigue crack growth tests were conducted at 450, 550, 650 and 700°C. Crack closure level was measured using the interferometric strain/displacement gage (I.S.D.G.), described in the previous paper, Crack growth rates for stress ratio R=-0.1 plotted against stress intensity factor range, ΔK, deviated from those for R=0.5. Using the effective stress intensity factor range, ΔKeff, which was calculated using crack opening ratio determined from the I.S.D.G. measurement, the R-dependence of the crack growth behaviors for R=-0.1 and R=0.5 were reconciled at each test temperature. A threshold value, ΔKeff, th, of fatigue crack growth was determined at each temperature. It was found that the threshold value reached a maximum at a temperature between 450 and 550°C.
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