Implementation of plasticity model for a steel with mixed cyclic softening and hardening and its application to fatigue assessments

Okorokov, Volodymyr and Comlekci, Tugrul and MacKenzie, Donald and van Rijswick, Ralph and Gorash, Yevgen; Bailey, P. and Berto, F. and Cawte, E.R. and Roberts, P. and Whittaker, M.T. and Yates, J.R., eds. (2017) Implementation of plasticity model for a steel with mixed cyclic softening and hardening and its application to fatigue assessments. In: Fatigue 2017 Proceedings of the 7th Engineering Integrity Society International Conference on Durability & Fatigue. Engineering Integrity Society, GBR, pp. 72-81. ISBN 9780954436834

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Abstract

This paper presents a numerical modelling and experimental investigation of the cyclic plasticity behaviour of low carbon steel. In order to improve the accuracy of modelling the material response under cycling loading, a new set of internal variables is proposed. The developed plasticity model is applied to the problem of modelling compressive residual stress inducing methods which are based on a plastic overload of a material. A beneficial influence of induced compressive residual stress is demonstrated on a benchmark problem of autofrettage of a high pressure thick-walled cylinder. Numerical simulation of the cyclic plasticity problems and fatigue assessments are carried out by means of FEM in ANSYS Workbench with FORTRAN user-programmable subroutines for material model incorporating custom equations.

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