Simulation of the fatigue behaviour of a power plant steel with a damage variable

Lu, Jiawa, Sun, Wei, Becker, Adib A. and Saad, Abdullah Aziz (2015) Simulation of the fatigue behaviour of a power plant steel with a damage variable. International Journal of Mechanical Sciences, 100 . pp. 145-157. ISSN 0020-7403

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The fatigue behaviour of a 9Cr power plant steel at a temperature of 600 °C was studied by uniaxial fatigue tests and microstructural analysis using electron microscopy. A continuum damage mechanics apporach was coupled to the constitutive equations of the Chaboche elasto-visco-plastic model to describe the fatigue behaviour of the 9Cr power plant steel at 600 °C. A stress partition method is introduced to understand the fatigue softening behaviour, and used to give an initial estimate of the material constants in the Chaboche model. Further optimisation procedures with plastic strain range dependency of the material constants were introduced in the optimisation procedure in order to accurately predict the material behaviour, especially after damage initiation. An ABAQUS UMAT subroutine was coded to allow the full life cyclic softening behaviour of a power plant component to be accurately predicted in a finite element calculation. The multiaxial capability of the coding is validated against notched bar test data.

Item Type: Article
Keywords: Cyclic plasticity; Chaboche visco-plasticity model; Continuum damage mechanics; UMAT subroutine
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
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Depositing User: Eprints, Support
Date Deposited: 22 Jul 2016 08:55
Last Modified: 04 May 2020 17:14

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