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Title: Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel
Authors: Zhao, Nailong
Roy, Anish
Wang, Weizhe
Zhao, Liguo
Silberschmidt, Vadim V.
Keywords: Crystal plasticity
Continuum damage
Creep
Finite element
Power plant
Issue Date: 2019
Publisher: Crown copyright © Elsevier BV
Citation: ZHAO, N. ... et al., 2019. Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel. Mechanics of Materials, 130, pp. 29-38.
Abstract: 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.
Description: This paper is in closed access until 12th Jan 2020
Sponsor: 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.
Version: Accepted for publication
DOI: 10.1016/j.mechmat.2019.01.006
URI: https://dspace.lboro.ac.uk/2134/36654
Publisher Link: https://doi.org/10.1016/j.mechmat.2019.01.006
ISSN: 0167-6636
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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