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Anisotropic hardening model based on non-associated flow rule and combined nonlinear kinematic hardening for sheet materials

Taherizadeh,A, Green,D and Yoon,J 2014, Anisotropic hardening model based on non-associated flow rule and combined nonlinear kinematic hardening for sheet materials, in NUMISHEET 2014 : Proceedings of the 9th International Conference and Workshop on Numerical Simulation 3D Sheet Metal Forming Processes, AIP Publishing, Melville, N.Y., pp. 496-499, doi: 10.1063/1.4850020.

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Title Anisotropic hardening model based on non-associated flow rule and combined nonlinear kinematic hardening for sheet materials
Author(s) Taherizadeh,A
Green,D
Yoon,JORCID iD for Yoon,J orcid.org/0000-0002-7616-5253
Conference name Numerical Simulation 3D Sheet Metal Forming Processes. Conference and Workshop (9th : 2014 : Melbourne, Victoria)
Conference location Melbourne, Victoria
Conference dates 2014/1/6 - 2014/1/10
Title of proceedings NUMISHEET 2014 : Proceedings of the 9th International Conference and Workshop on Numerical Simulation 3D Sheet Metal Forming Processes
Editor(s) Yoon,J
Stoughton,TB
Publication date 2014
Conference series Numerical Simulation 3D Sheet Metal Forming Processes Conference and Workshop
Start page 496
End page 499
Total pages 4
Publisher AIP Publishing
Place of publication Melville, N.Y.
Summary  A material model for more effective analysis of plastic deformation of sheet materials is presented in this paper. The model is capable of considering the following aspects of plastic deformation behavior of sheet materials: the anisotropy in yielding stresses in different directions by using a quadratic yield function (based on Hill’s 1948 model and stress ratios), the anisotropy in work hardening by introducing non-constant flow stress hardening in different directions, the anisotropy in plastic strains in different directions by using a quadratic plastic potential function and non-associated flow rule (based on Hill’s 1948 model and plastic strain ratios, r-values), and finally some of the cyclic hardening phenomena such as Bauschinger’s effect and transient behavior for reverse loading by using a coupled nonlinear kinematic hardening (so-called Armstrong-Frederick-Chaboche model). Basic fundamentals of the plasticity of the model are presented in a general framework. Then, the model adjustment procedure is derived for the plasticity formulations. Also, a generic numerical stress integration procedure is developed based on backward-Euler method (so-called multistage return mapping algorithm). Different aspects of the model are verified for DP600 steel sheet. Results show that the new model is able to predict the sheet material behavior in both anisotropic hardening and cyclic hardening regimes more accurately. By featuring the above-mentioned facts in the presented constitutive model, it is expected that more accurate results can be obtained by implementing this model in computational simulations of sheet material forming processes. For instance, more precise results of springback prediction of the parts formed from highly anisotropic hardened materials or that of determining the forming limit diagrams is highly expected by using the developed material model.
ISBN 9780735411951
ISSN 0094-243X
Language eng
DOI 10.1063/1.4850020
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting
HERDC Research category E1 Full written paper - refereed
ERA Research output type E Conference publication
Copyright notice ©2014, AIP Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070046

Document type: Conference Paper
Collection: School of Engineering
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