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A unified viscoplastic model for high temperature low cycle fatigue of service-aged P91 steel

Barrett, R.A.; Farragher, T.P.; Hyde, Christopher J.; O'Dowd, N.P.; O'Donoghue, P.E.; Leen, S.B.


R.A. Barrett

T.P. Farragher

Christopher J. Hyde

N.P. O'Dowd

P.E. O'Donoghue

S.B. Leen


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 plants where a significant stress range is experienced during operational cycles and at stress concentration features, such as welds and branched connections. The material model is successfully applied to the characterisation of the high temperature low cycle fatigue behavior of a service-aged P91 material, including isotropic (cyclic) softening and nonlinear kinematic hardening effects, across a range of temperatures and strain-rates.

Journal Article Type Article
Publication Date Apr 1, 2014
Journal Journal of Pressure Vessel Technology
Print ISSN 0094-9930
Electronic ISSN 1528-8978
Publisher American Society of Mechanical Engineers
Peer Reviewed Peer Reviewed
Volume 136
Issue 2
Article Number 021402
APA6 Citation Barrett, R., Farragher, T., Hyde, C. J., O'Dowd, N., O'Donoghue, P., & Leen, S. (2014). A unified viscoplastic model for high temperature low cycle fatigue of service-aged P91 steel. Journal of Pressure Vessel Technology, 136(2), doi:10.1115/1.4025618
Keywords service-aged P91, strain-rate independence, unified viscoplasticity, high temperature low cycle fatigue, material Jacobian
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf