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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.

Authors

R.A. Barrett

T.P. Farragher

Christopher J. Hyde

N.P. O'Dowd

P.E. O'Donoghue

S.B. Leen



Abstract

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.

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), Article 021402. https://doi.org/10.1115/1.4025618

Journal Article Type Article
Acceptance Date Aug 25, 2013
Online Publication Date Jan 7, 2014
Publication Date Apr 1, 2014
Deposit Date Sep 19, 2017
Publicly Available Date Mar 28, 2024
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
DOI https://doi.org/10.1115/1.4025618
Keywords service-aged P91, strain-rate independence, unified viscoplasticity, high temperature low cycle fatigue, material Jacobian
Public URL https://nottingham-repository.worktribe.com/output/996202
Publisher URL http://pressurevesseltech.asmedigitalcollection.asme.org/article.aspx?articleid=1750097