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OXIDATION‐ASSISTED FATIGUE CRACK GROWTH BEHAVIOR IN ALLOY 718‐PART II. APPLICATIONS
Author(s) -
Zheng D.,
Ghonem H.
Publication year - 1991
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.1460-2695.1991.tb00704.x
Subject(s) - alloy , materials science , paris' law , duration (music) , work (physics) , fatigue testing , structural engineering , metallurgy , growth model , low cycle fatigue , fracture mechanics , crack closure , composite material , engineering , mechanical engineering , mathematics , physics , mathematical economics , acoustics
In previous work by the authors, a quantitative model based on a two‐stage oxidation mechanism was developed to describe the oxidation‐assisted crack growth behavior in alloy 718. This model is used here to predict the crack growth rate in this alloy at 650°C for two different loading conditions: one is a continuous cycle with a hold time duration of 300 s imposed at minimum load, the other is a continuous cycle without a hold time duration. The results obtained from applying the model to these loading profiles were then compared with those obtained experimentally. Good agreement was observed between the two data sets. Details of the model calculations are discussed, and suggestions to further extend the model capabilities are made in this paper.