An extension for the Ohno-Wang kinematic hardening rules to incorporate isotropic hardening

In this work, an extension of the well-known Ohno-Wang model to incorporate isotropic hardening is presented and discussed. The model is extended by taking into account isotropic hardening depending on accumulated plastic strain. It is assumed that isotropic hardening will be associated with kinematic hardening in the governing equations where activation of either isotropic or kinematic hardening is controlled through a specific controller parameter K. The accuracy of simulations can be adjusted by changing the value of this controller parameter. It is shown that such an extension is effective and restrains activation of dynamic recovery resulting in less accumulated ratchetting strain with large values of the controller parameter. In addition, it is shown that the extended model simulates multiaxial ratchetting experiments conducted on SS 304L by Hassan et al. fairly well. (C) 2010 Elsevier Ltd. All rights reserved.