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 (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, Rutland, UK, 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.