The finite element (FE) implementation of a hyperbolic sine unified cyclic viscoplasticity model is presented. The hyperbolic sine flow rule facilitates the identification of strain-rate independent material parameters for high temperature applications. This is important for the thermo-mechanical fatigue of power plant where a significant stress range is experienced during operational cycles and at stress concentration features, such as welds and branch connections. The material model is successfully applied to the characterisation of the high temperature low cycle fatigue behaviour of a service-aged P91 material, including isotropic (cyclic) softening and non-linear kinematic hardening effects, across a range of temperatures and strain-rates.
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ASME 2013 Pressure Vessels and Piping Conference
July 14–18, 2013
Paris, France
Conference Sponsors:
- Pressure Vessels and Piping Division
- Nondestructive Evaluation Engineering Division
ISBN:
978-0-7918-5571-3
PROCEEDINGS PAPER
A Unified Viscoplastic Model for High Temperature Low Cycle Fatigue of Service-Aged P91 Steel
P. E. O’Donoghue,
P. E. O’Donoghue
NUI Galway, Galway, Ireland
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S. B. Leen
S. B. Leen
NUI Galway, Galway, Ireland
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R. A. Barrett
NUI Galway, Galway, Ireland
P. E. O’Donoghue
NUI Galway, Galway, Ireland
S. B. Leen
NUI Galway, Galway, Ireland
Paper No:
PVP2013-98003, V06BT06A007; 8 pages
Published Online:
January 17, 2014
Citation
Barrett, RA, O’Donoghue, PE, & Leen, SB. "A Unified Viscoplastic Model for High Temperature Low Cycle Fatigue of Service-Aged P91 Steel." Proceedings of the ASME 2013 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Paris, France. July 14–18, 2013. V06BT06A007. ASME. https://doi.org/10.1115/PVP2013-98003
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