Plasticity Model for Structural Steel with Lode Angle Dependence
Publication: Journal of Bridge Engineering
Volume 26, Issue 12
Abstract
In recent years, the Lode angle was found to have a significant effect on plasticity and fracture strain of ductile metal under shear dominant loading, and the classical J2 plasticity theory generally overestimates the cases under shear dominant loading. In practice, shear dominant loading is common, that is, fillet-welded joints, partial-penetration welded joints, and metallic shear dampers. Therefore, it is important to study plasticity of structural steel under shear dominant loading and develop corresponding plasticity models for accurate evaluation of the plasticity and fracture of metallic structures. A plasticity model considering the effect of the Lode angle was simplified based on previous studies. Eight types of specimens with different configurations were designed to generate different initial stress states. Three different material tests were conducted to figure out little anisotropy in different locations of steel plate. The integration process for the simplified plasticity model were studied, and a user-defined subroutine in ABAQUS was developed for the model. A postnecking modification method for the true stress–true strain was recommended to evaluate the postnecking behaviors of structural steel through comparison of experimental and numerical simulation results. The simplified single parameter plasticity model proved to have high accuracy for specimens under various stress states, and a detailed calibration process for the material parameter was also introduced.
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Acknowledgments
The financial supports from National Natural Science Foundation of China (NSFC) with Grant No. 51820105013 and No. 51971160 are greatly appreciated. Thanks to Dr. Ruiwen Li for the devoting help during the experiments, and Mr. Zucheng Yao for his valuable discussions.
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 12 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Mar 9, 2021
Accepted: Jul 26, 2021
Published online: Oct 4, 2021
Published in print: Dec 1, 2021
Discussion open until: Mar 4, 2022
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