Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel
journal contributionposted on 24.01.2019 by Nailong Zhao, Anish Roy, Weizhe Wang, Liguo Zhao, Vadim Silberschmidt
Any type of content formally published in an academic journal, usually following a peer-review process.
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.
The authors greatly acknowledge the financial support from the China Scholarship Council. AR acknowledges funding from the Engineering and Physical Sciences Research Council (UK) through grant EP/P027555/1, H2 Manufacturing.
- Mechanical, Electrical and Manufacturing Engineering