Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS, including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”
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December 2009
Research Papers
Modeling and Verification of Creep Strain and Exhaustion in a Welded Steam Mixer
Stefan Holmström,
e-mail: stefan.holmstrom@vtt.fi
Stefan Holmström
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
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Juhani Rantala,
Juhani Rantala
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
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Anssi Laukkanen,
Anssi Laukkanen
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
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Kari Kolari,
Kari Kolari
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
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Heikki Keinänen,
Heikki Keinänen
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
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Olli Lehtinen
Olli Lehtinen
Fortum Power and Heat
, 00048 Fortum, Finland
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Stefan Holmström
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finlande-mail: stefan.holmstrom@vtt.fi
Juhani Rantala
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
Anssi Laukkanen
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
Kari Kolari
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
Heikki Keinänen
VTT Technical Research Centre of Finland
, P.O. Box 1000, FI-02044 VTT, Finland
Olli Lehtinen
Fortum Power and Heat
, 00048 Fortum, FinlandJ. Pressure Vessel Technol. Dec 2009, 131(6): 061405 (5 pages)
Published Online: October 13, 2009
Article history
Received:
August 13, 2008
Revised:
June 10, 2009
Published:
October 13, 2009
Citation
Holmström, S., Rantala, J., Laukkanen, A., Kolari, K., Keinänen, H., and Lehtinen, O. (October 13, 2009). "Modeling and Verification of Creep Strain and Exhaustion in a Welded Steam Mixer." ASME. J. Pressure Vessel Technol. December 2009; 131(6): 061405. https://doi.org/10.1115/1.4000201
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