Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel. (March 2019)

• Record Type: Journal Article
• Authors: Zhao, Nailong; Roy, Anish; Wang, Weizhe; Zhao, Liguo; Silberschmidt, Vadim V.
• Is Part Of: Mechanics of materials. Volume 130(2019)
• Page Start: 29
• Page End: 38
• Publication Date: 2019-03
• Subjects: Crystal plasticity -- Continuum damage -- Creep -- Finite element -- Power plant; Strength of materials -- Periodicals; Mechanics, Applied -- Periodicals; Résistance des matériaux -- Périodiques; Mécanique appliquée -- Périodiques; Mechanics, Applied; Strength of materials; Periodicals; Electronic journals; 620.11
• DOI: 10.1016/j.mechmat.2019.01.006
• Languages: English
• ISSNs: 0167-6636

Abstract

Highlights: Crystal plasticity model is combined with a continuum damage model. Account for a range of imposed stress level and temperature. Ideal for modelling creep in Cr-based alloys. Can model primary and secondary creep stages. Abstract: To improve the design and safety of power plant components, long-term high-temperature 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.