期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 23, 期 -, 页码 451-465出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2023.01.010
关键词
Anisotropic hardening; Strain path change; Prestrain; Constitutive model
In this study, the work hardening characteristics of a high strength steel sheet were investigated after undergoing plastic strain in rolling and transverse directions. It was found that a material with mild initial anisotropy showed strong anisotropic work hardening effect after strain path change. A mathematical model was proposed to reproduce the observed hardening phenomena, which can be easily implemented into existing FEM software. The model was validated through comparing simulation results with experimental measurements.
Anisotropic yielding and hardening behaviors are important parts of a constitutive model for material formability and strength assessment. In this work, the work hardening characteristics of a high strength steel sheet after it was subjected to 2% and 5% plastic strain in rolling and transverse directions were investigated by both the experimental measurement and mathematical modelling. It was observed that the material with the mild initial anisotropy showed a strong anisotropic work hardening effect after strain path was changed. A material model was proposed by Ma and Aung in order to reproduce the observed hardening phenomena under various conditions of strain path change. The proposed formulation has a simple form mathematically derived from a modified Swift law which can be easily implemented into existing FEM software as a user material model. This anisotropic hardening model for plane-stress condition was combined with Hill48 yield function and associative flow rule for numerical simulations. The model was validated through comparing the simulation results with experimentally measured stress-strain curves.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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