THE APPLICATION OF STRESS RUPTURE DATA FOR THE PREDICTION OF THE HTLCF LIVES OF TWO NICKEL BASE ALLOYS
The high temperature low cycle fatigue lives of some nickel-base alloys are predicted using stress rupture data in combination with a "Linear Time Dependent Damage Accumulation" rule. It applies when the ratio r of the inelastic strain - rate in the fatigue cycle to the minimum creep rate in a stress rupture test at a stress equal to the maximum tensile stress in the cycle and at the same temperature, is near to unity. No fitting parameter is required. For cases where the contribution of creep to the total deformation rate is small and r largely exceeds unity, a modified rule is proposed. This "Strain Rate Modified Accumulation of Time Dependent Damage" or SRM rule uses a single adjustable parameter. Provided that no damage mechanism boundaries are crossed upon extrapolation, the SRM rule successfully predicts cyclic lives at lower frequencies and at other test temperatures and cycle shapes.
Bibliographic Reference: HIGH TEMPERATURE ALLOYS FOR GAS TURBINES AND OTHER APPLICATIONS 1986, LIEGE (BELGIUM), OCT. 6-9, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32764 ORA
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Record Number: 1989125074100 / Last updated on: 1987-12-01
Available languages: en