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

An elastic-viscoplastic constitutive material model is developed for the representation of creep response a 10%Cr steel under cyclic loading conditions. It has been shown that able to describe primary regeneration (PCR), i.e. incidence period high strain rate following stress reversal. The variant well-known Chaboche viscoplastic model, and employs bi-term power-law equation represent stress-regime dependence response. Back drag are used kinematic isotropic hardening/softening behaviour material, respectively. evolutions back consider contributions from hardening, dynamic softening, static recovery hardening/softening. effectiveness describing sensitivity PCR different parameters (e.g. reverse-loading magnitude duration) effect activation on overall accumulation discussed. Furthermore, predictive capability demonstrated during two independent benchmark tests; stress-varying low-cycle fatigue experiments.