Simulation of creep and cyclic viscoplastic strains in high-Cr steel components based on a modified becker-hackenberg model

Wang, J., Steinmann, P. , Rudolph, J. and Willuweit, A. (2015) Simulation of creep and cyclic viscoplastic strains in high-Cr steel components based on a modified becker-hackenberg model. International Journal of Pressure Vessels and Piping, 128, pp. 36-47. (doi: 10.1016/j.ijpvp.2015.02.003)

Full text not currently available from Enlighten.

Abstract

A constitutive model is proposed to simulate the thermo-mechanical behavior of high-Cr steel components. In this model, the total inelastic strain is decomposed into the creep strain and the viscoplastic strain. For creep strain, two Larson-Miller parameters are adopted to evaluate the minimum creep rate and the average creep rupture time. The cyclic viscoplastic strain is predicted through the conventional Chaboche-type modeling approach with the viscoplastic strain rate. The cyclic softening effect, ratcheting effect, time recovery effect and temperature rate effect are taken into account in the kinematic and isotropic hardening rules. A strategy of stress-range separation is proposed to identify the involved material parameters. Some examples are presented to show that the current model can predict the response of high-Cr steels at a quantitative level. This model provides an opportunity to evaluate the remaining lifetimes of power plant components subject to long dwell time in combination with variable loading conditions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Steinmann, Professor Paul
Authors: Wang, J., Steinmann, P., Rudolph, J., and Willuweit, A.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:International Journal of Pressure Vessels and Piping
Publisher:Elsevier
ISSN:0308-0161
Published Online:14 February 2015
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record