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The investigation of primary creep regeneration for 10%Cr martensitic steel: Unified constitutive modelling

The effectiveness of the developed model for describing the sensitivity of the PCR behaviour to different loading parameters (e.g. reverse-loading magnitude and duration) and to represent the effect of PCR activation on the overall strain accumulation behaviour of the material is discussed. | International Journal of Mechanical Sciences 190 2021 106044 Contents lists available at ScienceDirect International Journal of Mechanical Sciences journal homepage www.elsevier.com locate ijmecsci The investigation of primary creep regeneration for 10 Cr martensitic steel Unified constitutive modelling X. Li a b S.R. Holdsworth a E. Mazza a b E. Hosseini a a Empa Swiss Federal Laboratories for Material Science and Technology Überlandstrasse 129 CH-8600 Dübendorf Switzerland b ETH Zürich Institute for Mechanical Systems Department of Mechanical and Process Engineering 8092 Zürich Switzerland a r t i c l e i n f o a b s t r a c t Keywords An elastic-viscoplastic constitutive material model is developed for the representation of the creep response of Viscoplastic constitutive model a 10 Cr steel under cyclic loading conditions. It has been shown that the model is able to describe primary Primary creep regeneration creep regeneration PCR i.e. the incidence of a period of high creep strain rate following a stress reversal. The Chaboche model developed model is a variant of the well-known Chaboche viscoplastic constitutive model and employs a bi-term Stress-varying creep loading power-law equation to represent the stress-regime dependence of the viscoplastic strain rate response. Back stress 10 Cr steel and drag stress are used to describe the kinematic and isotropic hardening softening behaviour of the material respectively. The evolutions of back stress and drag stress consider contributions from strain hardening dynamic softening static recovery and cyclic hardening softening. The effectiveness of the developed model for describing the sensitivity of the PCR behaviour to different loading parameters e.g. reverse-loading magnitude and duration and to represent the effect of PCR activation on the overall strain accumulation behaviour of the material is discussed. Furthermore the predictive capability of the model is demonstrated for describing the response of the material