A service-aged P91 steel was used to perform an experimental program of cyclic mechanical testing in the temperature range of 400 °C–600 °C, under isothermal conditions, using both saw-tooth and dwell (inclusion of a constant strain dwell period at the maximum (tensile) strain within the cycle) waveforms. The results of this testing were used to identify the material constants for a modified Chaboche, unified viscoplasticity model, which can deal with rate-dependant cyclic effects, such as combined isotropic and kinematic hardening, and time-dependent effects, such as creep, associated with viscoplasticity. The model has been modified in order that the two-stage (nonlinear primary and linear secondary) softening which occurs within the cyclic response of the service-aged P91 material is accounted for and accurately predicted. The characterization of the cyclic viscoplasticity behavior of the service-aged P91 material at 500 °C is presented and compared to experimental stress–strain loops, cyclic softening and creep relaxation, obtained from the cyclic isothermal tests.
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August 2014
Technical Briefs
Cyclic Viscoplasticity Testing and Modeling of a Service-Aged P91 Steel
C. J. Hyde,
C. J. Hyde
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
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W. Sun,
W. Sun
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
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T. H. Hyde,
T. H. Hyde
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
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J. P. Rouse,
J. P. Rouse
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
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T. Farragher,
T. Farragher
Mechanical and Biomedical Engineering,
College of Engineering and Informatics,
College of Engineering and Informatics,
NUI Galway
,Galway
, Ireland
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Noel P. O'Dowd,
Noel P. O'Dowd
Materials and Surface Science Institute,
University of Limerick
,Limerick
, Ireland
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S. B. Leen
S. B. Leen
Mechanical and Biomedical Engineering,
College of Engineering and Informatics,
College of Engineering and Informatics,
NUI Galway
,Galway
, Ireland
Search for other works by this author on:
C. J. Hyde
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
W. Sun
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
T. H. Hyde
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
J. P. Rouse
Department of Mechanical,
Materials and Manufacturing Engineering,
Materials and Manufacturing Engineering,
The University of Nottingham
,University Park
,Nottingham, NG7 2RD
, UK
T. Farragher
Mechanical and Biomedical Engineering,
College of Engineering and Informatics,
College of Engineering and Informatics,
NUI Galway
,Galway
, Ireland
Noel P. O'Dowd
Materials and Surface Science Institute,
University of Limerick
,Limerick
, Ireland
S. B. Leen
Mechanical and Biomedical Engineering,
College of Engineering and Informatics,
College of Engineering and Informatics,
NUI Galway
,Galway
, Ireland
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 23, 2012; final manuscript received February 14, 2014; published online April 16, 2014. Assoc. Editor: Osamu Watanabe.
J. Pressure Vessel Technol. Aug 2014, 136(4): 044501 (5 pages)
Published Online: April 16, 2014
Article history
Received:
August 23, 2012
Revision Received:
February 14, 2014
Citation
Hyde, C. J., Sun, W., Hyde, T. H., Rouse, J. P., Farragher, T., O'Dowd, N. P., and Leen, S. B. (April 16, 2014). "Cyclic Viscoplasticity Testing and Modeling of a Service-Aged P91 Steel." ASME. J. Pressure Vessel Technol. August 2014; 136(4): 044501. https://doi.org/10.1115/1.4026865
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