Modeling of multiaxial creep behavior for Incoloy 800 tubes under internal pressure

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Journal of Pressure Vessel Technology

DOI:https://doi.org/10.1115/1.2842310· OSTI ID:527600

Koundy, V; Forgeron, T; Le Naour, F ^[1]

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1. CEA-Saclay, Gif-Sur-Yvette (France)

In order to validate the long-term behavior of fast breeder reactor steam generator tubes, a creep test monitoring program has been undertaken. A series of over one hundred tests was performed on small specimen tubes which were cut from the as-received tube material of Incoloy 800, similar to those used in generator applications. In contrast to uniaxial conditions in which constant load conditions usually apply; multiaxial experiments were performed assuming constant stress conditions. Thin-walled tube approximation was used to estimate the stresses across the tube wall thickness required for given internal tube pressures. This paper deals with a refined numerical modeling of stresses and strains in the pressurized test specimens, taking into account: internal pressure changes, nonlinear geometrical effects, and creep deformation during all the test procedure cycles. Comparison of the numerical results with the experimental measurements shows a good agreement which validates the multiaxial generalization of the RCC-MR strain creep laws which were used in the calculations. A multiaxial creep rupture criterion is discussed.

• Sponsoring Organization: USDOE
• OSTI ID: 527600
• Journal Information: Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 3 Vol. 119; ISSN JPVTAS; ISSN 0094-9930
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
COMPARATIVE EVALUATIONS
CREEP
FBR TYPE REACTORS
INCOLOY 800
MECHANICAL TESTS
STEAM GENERATORS
THEORETICAL DATA
TUBES