5. Extrapolations and predictions of long-term creep behavior
For the design of certain parts that will be in service for many years, it is necessary to extrapolate creep results obtained from short tests and/or at temperatures higher than the service temperature, in order to accelerate deformation (or reduce test times).
These extrapolations are sometimes based on assumptions that we will describe in detail below.
5.1 Extrapolation from a constraint-time graph
This method is used when extrapolations are made at temperatures identical to those of the reference tests. It involves constructing a graph of lg σ as a function of lg t. At a given temperature and for each test constraint, the time reported is either :
to achieve a given deformation, generally...
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Extrapolations and predictions of long-term creep behavior
Creep associated with oxidation and/or fatigue phenomena
Bibliography
References
Standardization
French Standards Association (AFNOR)
- Produits en acier. Essai de fluage - NF A03-355 - Déc. 1985
- Forets à centrer pour centres sans chanfrein de protection. Type A. Indice de classement : E66-053. - NF ISO 866 - Janv. 2004
- Forets à centrer pour centres avec chanfrein de protection. Type B Indice de classement E66-054. - NF ISO 2540 - Janv. 2004
- Forets à centrer pour centres à profil curviligne....
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