1999 Volume 42 Issue 1 Pages 97-103
Fatigue crack growth tests were conducted at 450, 550, 650 and 700(°C)using type 304 stainless steel. 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 and effective J-integral range, ΔJf, eff which were calculated using crack opening ratio determined from the I.S.D.G. measurement, the crack growth behaviors for R=0.1 and 0.5 were reconciled at each test temperature. A threshold value, ΔKeff, th of fatigue crack growth was determined at each temperature investigated. It was found that the threshold value reached a maximum at a temperature between 450 and 550(°C).
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