Characterization of viscoplasticity behaviour of P91 and P92 power plant steels

Saad, Abdullah Aziz, Hyde, T.H., Sun, W., Hyde, Christopher J. and Tanner, David W. J. (2013) Characterization of viscoplasticity behaviour of P91 and P92 power plant steels. International Journal of Pressure Vessels and Piping, 111-112 . pp. 246-252. ISSN 0308-0161

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This paper deals with the determination of material constitutive model for P91 and P92 steels at high temperatures. An isothermal, strain-controlled test programme was conducted for both steels for a temperature range between 400 and 675 °C. The experimental data from these tests were used to obtain the material constants in a viscoplasticity model. The model includes the effects of isotropic and kinematic hardening, as well as time-dependent effects, and has been used to model the cyclic material behaviour of each material. Material constants were initially determined from initial cycle stress–strain data, maximum stress evolution data and stress relaxation data. The material constants were improved by use of a least-squares optimisation algorithm. The constitutive models have been implemented into the ABAQUS finite element (FE) code by using the Z-mat software. The performances of the material models for both steels have been assessed by comparing predictions with experimental data obtained from the tests.

Item Type: Article
Keywords: Viscoplasticity model, P91, P92, Thermo-mechanical fatigue
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number:
Depositing User: Eprints, Support
Date Deposited: 19 Sep 2017 07:28
Last Modified: 04 May 2020 16:40

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