A constitutive law based on the self-consistent homogenization theory for improved springback simulation of a dual-phase steel

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Abstract

It has been widely observed that below the flow stress of a plastically deformed material the stress-strain response of the material does not obey the linear relation assumed in classical elasto-plastic models. As a matter of fact, a closer observation indicates that the stress-strain response of the material is nonlinear upon unloading. This results in a larger strain recovery than predicted by the linear elastic law which consequently results in an error in springback prediction. Furthermore, when the material undergoes compression after tension, it exhibits Bauschinger effect, transient behavior and permanent softening. The accuracy of the springback prediction is dependent on the capability of the model in capturing the above mentioned phenomena. In this work a constitutive law based on the self-consistent homogenization method is developed. In this model the stress inhomogeneity in the material is realized through considering a distribution in yielding of individual material fractions. The model was calibrated using stress-strain curves obtained from tension-compression experiments. The model has shown to be capable of predicting the nonlinear unloading behavior and the Bauschinger effect while maintaining computational efficiency for FEM simulations.

Original languageEnglish
Title of host publicationJournal of Physics: Conference series
Number of pages7
Volume1063
Edition1
DOIs
Publication statusPublished - 6 Aug 2018
Event11th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes, NUMISHEET 2018 - Hotel East 21 Tokyo, Tokyo, Japan
Duration: 30 Jul 20183 Aug 2018
Conference number: 11
http://numisheet2018.org/

Publication series

NameJournal of physics: Conference series
PublisherIOP Publishing Ltd.
ISSN (Print)1742-6588

Conference

Conference11th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes, NUMISHEET 2018
Abbreviated titleNUMISHEET 2018
CountryJapan
CityTokyo
Period30/07/183/08/18
Internet address

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homogenizing
steels
Bauschinger effect
unloading
simulation
predictions
softening
inhomogeneity
plastics
recovery
curves

Cite this

Torkabadi, A. ; Perdahcioǧlu, E.S. ; van den Boogaard, A.H. / A constitutive law based on the self-consistent homogenization theory for improved springback simulation of a dual-phase steel. Journal of Physics: Conference series. Vol. 1063 1. ed. 2018. (Journal of physics: Conference series).
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abstract = "It has been widely observed that below the flow stress of a plastically deformed material the stress-strain response of the material does not obey the linear relation assumed in classical elasto-plastic models. As a matter of fact, a closer observation indicates that the stress-strain response of the material is nonlinear upon unloading. This results in a larger strain recovery than predicted by the linear elastic law which consequently results in an error in springback prediction. Furthermore, when the material undergoes compression after tension, it exhibits Bauschinger effect, transient behavior and permanent softening. The accuracy of the springback prediction is dependent on the capability of the model in capturing the above mentioned phenomena. In this work a constitutive law based on the self-consistent homogenization method is developed. In this model the stress inhomogeneity in the material is realized through considering a distribution in yielding of individual material fractions. The model was calibrated using stress-strain curves obtained from tension-compression experiments. The model has shown to be capable of predicting the nonlinear unloading behavior and the Bauschinger effect while maintaining computational efficiency for FEM simulations.",
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Torkabadi, A, Perdahcioǧlu, ES & van den Boogaard, AH 2018, A constitutive law based on the self-consistent homogenization theory for improved springback simulation of a dual-phase steel. in Journal of Physics: Conference series. 1 edn, vol. 1063, Journal of physics: Conference series, 11th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes, NUMISHEET 2018, Tokyo, Japan, 30/07/18. https://doi.org/10.1088/1742-6596/1063/1/012120

A constitutive law based on the self-consistent homogenization theory for improved springback simulation of a dual-phase steel. / Torkabadi, A.; Perdahcioǧlu, E.S.; van den Boogaard, A.H.

Journal of Physics: Conference series. Vol. 1063 1. ed. 2018. (Journal of physics: Conference series).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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