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A NEW METHOD TO PREDICT THE LIFE UNDER HIGH‐TEMPERATURE LOW CYCLE FATIGUE CONDITIONS
Author(s) -
Danzer R.,
Bressers J.
Publication year - 1986
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1986.tb00443.x
Subject(s) - low cycle fatigue , materials science , creep , structural engineering , stress (linguistics) , test data , thermodynamics , metallurgy , engineering , physics , linguistics , philosophy , software engineering
The low cycle fatigue lives of some nickel‐base alloys tested at high temperature are predicted using a linear time dependent damage accumulation rule. Based on stress rupture data, the rule correctly predicts the cyclic life provided that the ratio of the inelastic strain rate in the cycle to the minimum creep rate in a stress rupture test (performed at the maximum cycle stress and at the same temperature) is near to one. If this ratio is much larger than one, the rule gives an upper limit to the cyclic life time. For that case a modified rule is proposed with a single fitting parameter which is adjusted to high frequency low‐cycle fatigue test data. Using the nickel‐base alloy data it is shown that life extrapolations to (i) low testing frequencies, (ii) a higher temperature and (iii) different cycle shapes, are possible too within a factor of two.