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.