Peer-Reviewed Journal Details
Mandatory Fields
Barrett, RA,O'Donoghue, PE,Leen, SB
International Journal Of Fatigue
An improved unified viscoplastic constitutive model for strain-rate sensitivity in high temperature fatigue
Optional Fields
sinh constitutive model Cyclic viscoplasticity P91 steel Thermo-mechanical fatigue Strain-rate sensitivity MODIFIED 9CR-1MO STEEL CYCLIC PLASTICITY FERRITIC STEEL P91 STEEL CREEP EQUATIONS BEHAVIOR DEFORMATION EVOLUTION RANGE
An improved unified cyclic viscoplastic material model for high temperature fatigue of P91 steel is presented. The primary enhancement over existing models is in relation to strain-rate independence of parameters, for accurate interpolation and extrapolation across a range of strain-rates and stress regimes, as relevant to flexible operation of high temperature power generation plant. The model combines a hyperbolic sine constitutive equation with anisothermal cyclic evolution of isotropic and kinematic hardening variables. The material model is developed from a thermodynamic framework and is implemented in multi-axial form within a user material subroutine. The user material subroutine is calibrated and validated for P91 steel across a range of cyclic (isothermal fatigue and thermo-mechanical fatigue) and noncyclic high temperature loading conditions. A novel method for the identification of the cyclic viscoplastic material parameters is also presented. (C) 2012 Elsevier Ltd. All rights reserved.
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