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An application of homogeneous anisotropic hardening to springback prediction in pre-strained U-draw/bending

Title
An application of homogeneous anisotropic hardening to springback prediction in pre-strained U-draw/bending
Authors
Jeong-Yeon LeeJinwoo LeeLee, MGBarlat, F
POSTECH Authors
Barlat, F
Date Issued
Dec-2012
Publisher
Elsevier
Abstract
In this work, a constitutive model based on anisotropic hardening was used in the finite element (FE) simulations of springback and its performance was compared with that of conventional hardening laws. The homogeneous yield function-based anisotropic hardening (HAH) model (Barlat et al., 2011), considered in this work, describes a partial distortion of the yield surface under plastic loading. Although it does not use the concept of kinematic hardening, the HAH model was able to predict the complex material behavior upon load reversals such as the Bauschinger effect, transient hardening and permanent softening. For the application to springback, FE simulations were conducted for U-draw/bending of base (as-received) and pre-strained DP780 steel sheets, which was recently proposed as one of the Numisheet 2011 benchmark problems. The predictions with the HAH model, combined with a non-quadratic anisotropic yield function and a plastic strain-dependent unloading modulus, were in good agreement with experimental results for both as-received and pre-strained DP780 sheets. (C) 2012 Elsevier Ltd. All rights reserved.
Keywords
U-draw/bending; Strain-path change; Springback; Anisotropic hardening model; Bauschinger effect; AUTOMOTIVE SHEETS; CYCLIC PLASTICITY; BACK EVALUATION; YIELD FUNCTIONS; TENSION-COMPRESSION; METAL PLASTICITY; ALLOY SHEETS; MODEL; BEHAVIOR; LAWS
URI
http://oasis.postech.ac.kr/handle/2014.oak/16209
DOI
10.1016/J.IJSOLSTR.2012.03.042
ISSN
0020-7683
Article Type
Article
Citation
International Journal of Solids and Structures, vol. 49, no. 25, page. 3562 - 3572, 2012-12
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 BARLAT, FREDERIC GERARD
Graduate Institute of Ferrous Technology
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