2134/36654 Nailong Zhao Nailong Zhao Anish Roy Anish Roy Weizhe Wang Weizhe Wang Liguo Zhao Liguo Zhao Vadim Silberschmidt Vadim Silberschmidt Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel Loughborough University 2019 Crystal plasticity Continuum damage Creep Finite element Power plant Mechanical Engineering not elsewhere classified Mechanical Engineering 2019-01-24 09:43:24 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Coupling_crystal_plasticity_and_continuum_damage_mechanics_for_creep_assessment_in_Cr-based_power-plant_steel/9545129 To improve the design and safety of power plant components, long-term hightemperature creep behaviour of a power-plant material, such as Cr-based alloy, should be assessed. Prior studies indicate that power-plant components undergo material degradation and premature failure by nucleation, growth and coalescence of microvoids as a result of creep damage. In classical crystal-plasticity-based models, a flow rule and a hardening law do not account for global stiffness degradation of materials due to evolving microvoids, having a significant influence on material behaviour, especially under large deformations. In this study, a crystal-plasticity scheme coupled with an appropriate continuum damage model is developed to capture the anisotropic creep-damage effect on the overall deformation behaviour of Cr-based power-plant steel. Numerical simulations show that the developed approach can characterize creep deformation of the material exposed to a range of stress levels and temperatures under consideration of stiffness degradation under large deformation.